Ficha de revisão: Fundamentals of Biological Sciences

📋 Course Outline

1. Cell Structure and Function
2. Biochemical Macromolecules
3. Enzyme Mechanisms
4. Genetic Inheritance
5. DNA Replication and Repair
6. Evolutionary Principles
7. Microbial Genetics
8. Plant and Animal Systems
9. Biotechniques and Instrumentation
10. Chemistry Fundamentals
11. Mathematics for Biotechnology
12. Physics Principles

📖 1. Cell Structure and Function

🔑 Key Concepts & Definitions

Concept	Definition	Example/Note
Prokaryotic Cell	A simple cell without a nucleus, with DNA in the cytoplasm.	Bacteria and archaea are prokaryotes.
Eukaryotic Cell	A complex cell with a nucleus and membrane-bound organelles.	Animal and plant cells are eukaryotic.
Cell Membrane	A semi-permeable membrane that controls substance exchange between the cell and its environment.	Composed mainly of phospholipids and proteins.
Organelles	Specialized structures within a cell that perform distinct functions (e.g., nucleus, mitochondria).	Mitochondria are the powerhouses of the cell.
Cell Cycle	The series of events that lead to cell division, including mitosis and meiosis.	Mitosis results in two identical daughter cells.

📝 Essential Points

• Cell Types: Prokaryotic cells are simpler, lacking membrane-bound organelles; eukaryotic cells are complex with compartmentalized organelles.
• Membrane Structure: Composed of a phospholipid bilayer with embedded proteins, facilitating selective permeability.
• Organelles & Functions:
  • Nucleus: Contains genetic material, site of DNA replication and transcription.
  • Mitochondria: Generate ATP via oxidative phosphorylation.
  • Endoplasmic Reticulum: Synthesizes proteins (rough ER) and lipids (smooth ER).
  • Golgi Apparatus: Modifies, sorts, and packages proteins.
  • Lysosomes: Digestive enzymes for waste breakdown.
• Cell Communication:
  • Signaling pathways include endocrine (hormones) and paracrine (local) signaling.
  • Extracellular matrix provides structural support.
  • Apoptosis is programmed cell death, crucial for development and homeostasis.
• Cell Cycle:
  • Mitosis: Division producing genetically identical cells.
  • Meiosis: Reductive division producing gametes with half the genetic material.

💡 Key Takeaway

Cell structure is intricately organized to support vital functions such as energy production, genetic information processing, and communication, with distinct differences between prokaryotic and eukaryotic cells underpinning their biological roles. Understanding these structures and processes is fundamental to biotechnology and molecular biology.

📖 2. Biochemical Macromolecules

🔑 Key Concepts & Definitions

• Macromolecules: Large, complex molecules essential for life, including proteins, nucleic acids, carbohydrates, and lipids.
• Proteins: Polymers of amino acids that perform structural, enzymatic, and regulatory functions.
• Nucleic Acids: DNA and RNA, molecules responsible for genetic information storage and transfer.
• Carbohydrates: Sugars and polysaccharides that serve as energy sources and structural components.
• Lipids: Hydrophobic molecules like fats, oils, and phospholipids involved in energy storage and cell membrane formation.
• Enzymes: Biological catalysts that accelerate biochemical reactions by lowering activation energy.

📝 Essential Points

• Structure & Function:
  • Proteins have primary, secondary, tertiary, and quaternary structures; their shape determines function.
  • Nucleic acids consist of nucleotide units; DNA is double-stranded, RNA is single-stranded.
  • Carbohydrates include monosaccharides (glucose), disaccharides (sucrose), and polysaccharides (starch, glycogen).
  • Lipids are mainly triglycerides, phospholipids, and steroids; their hydrophobic nature influences membrane dynamics.
• Enzyme Catalysis:
  • Enzymes bind substrates at active sites; their activity is affected by temperature, pH, and inhibitors.
  • Michaelis-Menten kinetics describe the rate of enzymatic reactions.
  • Enzyme regulation includes competitive, non-competitive, and uncompetitive inhibition.
• Biochemical Interactions:
  • Vitamins act as coenzymes, aiding enzymatic reactions.
  • High-energy compounds like ATP store and transfer energy within cells.
  • Bioenergetics involves understanding energy changes during biochemical processes.

💡 Key Takeaway

Biochemical macromolecules are fundamental to life, with their specific structures enabling diverse biological functions, from genetic information transfer to energy storage and enzymatic activity. Understanding their structure-function relationships is crucial for grasping cellular processes and biotechnology applications.

📖 3. Enzyme Mechanisms

🔑 Key Concepts & Definitions

• Enzyme: Biological catalyst that accelerates chemical reactions without being consumed, by lowering activation energy.
• Active Site: Specific region on an enzyme where substrate binding and catalysis occur.
• Substrate: Molecule upon which an enzyme acts.
• Enzyme-Substrate Complex: Transient, reversible complex formed when an enzyme binds to its substrate.
• Catalytic Mechanism: The process by which enzymes facilitate the conversion of substrates into products, often involving stabilization of transition states.
• Enzyme Regulation: Control of enzyme activity through inhibitors, activators, or allosteric modifications.

📝 Essential Points

• Enzymes work by decreasing the activation energy (Ea) of reactions, thus increasing reaction rates.
• The induced fit model explains how enzyme active sites undergo conformational changes upon substrate binding, enhancing catalysis.
• Enzyme activity is influenced by factors such as temperature, pH, substrate concentration, and presence of inhibitors.
• Michaelis-Menten kinetics describes the relationship between substrate concentration and reaction velocity, characterized by parameters Vmax (maximum velocity) and Km (Michaelis constant).
• Enzyme inhibition can be competitive, non-competitive, or uncompetitive, affecting enzyme activity differently:
  • Competitive: Inhibitor resembles substrate, binds to active site.
  • Non-competitive: Inhibitor binds elsewhere, altering enzyme shape.
  • Uncompetitive: Inhibitor binds only to enzyme-substrate complex.
• Vitamins often act as coenzymes, essential for enzyme function (e.g., Vitamin B6 in amino acid metabolism).
• Enzymes are highly specific for their substrates, often recognizing molecular shape and charge.

💡 Key Takeaway

Enzymes facilitate biological reactions by lowering activation energy through specific substrate binding and conformational changes, with activity tightly regulated to meet cellular needs. Understanding enzyme mechanisms is fundamental to biotechnology, medicine, and biochemistry.

📖 4. Genetic Inheritance

🔑 Key Concepts & Definitions

• Mendelian Inheritance: The pattern of inheritance that follows Gregor Mendel's laws, involving dominant and recessive alleles, segregation, and independent assortment.
• Gene: A segment of DNA that encodes for a specific trait or protein.
• Allele: Different forms of a gene occupying the same locus on homologous chromosomes.
• Genotype: The genetic makeup of an organism (e.g., homozygous, heterozygous).
• Phenotype: The observable traits or characteristics resulting from the genotype.
• Linkage: The tendency of genes located close to each other on the same chromosome to be inherited together.
• Recombination: The exchange of genetic material between homologous chromosomes during meiosis, leading to new allele combinations.
• Chromosomal Mutations: Structural changes in chromosomes, such as deletions, duplications, inversions, or translocations, affecting inheritance.

📝 Essential Points

• Mendelian Laws:
  • Law of Segregation: Alleles separate during gamete formation, ensuring each gamete carries only one allele for each gene.
  • Law of Independent Assortment: Genes for different traits assort independently during gamete formation, leading to genetic variation.
• Exceptions to Mendel:
  • Linked Genes: Genes close together on the same chromosome tend to be inherited together.
  • Incomplete Dominance: Heterozygote shows a phenotype intermediate between dominant and recessive.
  • Codominance: Both alleles are expressed equally in the heterozygote.
• Genetic Interactions:
  • Epistasis: One gene influences the expression of another.
  • Pleiotropy: A single gene affects multiple traits.
• Recombination & Mapping:
  • Recombination frequency helps determine the distance between genes on a chromosome.
  • 1% recombination = 1 map unit (centiMorgan).
• Genetic Disorders:
  • Caused by mutations or chromosomal abnormalities (e.g., Down syndrome, cystic fibrosis).
• Population Genetics:
  • Studies allele frequency changes over generations, explaining evolution and genetic diversity.

💡 Key Takeaway

Genetic inheritance involves the transmission of genes from parents to offspring, governed by Mendelian principles and influenced by genetic linkage, mutations, and interactions, which collectively generate biological diversity and can lead to genetic disorders.

📖 5. DNA Replication and Repair

🔑 Key Concepts & Definitions

• DNA Replication: The biological process of copying a DNA molecule to produce two identical DNA molecules, essential for cell division.
• Semi-conservative Replication: Each new DNA molecule consists of one original (template) strand and one newly synthesized strand.
• DNA Polymerase: Enzyme responsible for synthesizing new DNA strands by adding nucleotides complementary to the template strand.
• Leading and Lagging Strands: The two strands of DNA; the leading strand is synthesized continuously, while the lagging strand is synthesized in Okazaki fragments.
• Proofreading: The ability of DNA polymerase to correct errors during DNA synthesis, ensuring high fidelity.
• DNA Repair Mechanisms: Processes like mismatch repair, base excision repair, nucleotide excision repair, and double-strand break repair that correct DNA damage.

📝 Essential Points

• Replication Origin: Specific sites where DNA replication begins; multiple origins facilitate faster replication in eukaryotes.
• Replication Fork: Y-shaped structure formed during DNA unwinding, where new strands are synthesized.
• Enzymes Involved:
  • Helicase: Unwinds the DNA double helix.
  • Primase: Synthesizes RNA primers to initiate replication.
  • DNA Polymerase: Extends DNA strands; also has proofreading activity.
  • Ligase: Seals nicks between Okazaki fragments on the lagging strand.
• Replication Accuracy: Maintained through proofreading and mismatch repair; errors can lead to mutations.
• DNA Repair Importance: Maintains genomic stability; defects can cause diseases like cancer.
• Types of DNA Damage:
  • Single-strand breaks: Repaired mainly by base excision repair.
  • Double-strand breaks: Repaired by homologous recombination or non-homologous end joining.
  • Chemical modifications: Corrected via nucleotide excision repair.

💡 Key Takeaway

DNA replication is a highly accurate, semi-conservative process driven by specialized enzymes, and DNA repair mechanisms are vital for maintaining genetic integrity and preventing mutations.

📖 6. Evolutionary Principles

🔑 Key Concepts & Definitions

• Natural Selection: The process where organisms with advantageous traits are more likely to survive and reproduce, leading to the gradual evolution of populations.
• Descent with Modification: The principle that species change over generations, accumulating differences that lead to new species.
• Speciation: The formation of new and distinct species in the course of evolution, often due to reproductive isolation.
• Fossil Record: Preserved remains or traces of organisms from the past, providing evidence of evolutionary history.
• Phylogenetic Classification: Grouping organisms based on common ancestors and evolutionary relationships, often depicted as a phylogenetic tree.
• Origin of Life: The hypothesis that life arose from abiotic synthesis of organic molecules, leading to protocells and eventually multicellularity.

📝 Essential Points

• Darwinian Evolution: Explains how natural selection drives adaptation and speciation, supported by fossil records and genetic evidence.
• Types of Speciation: Allopatric (geographical isolation), sympatric (without physical barrier), and parapatric (adjacent populations).
• Fossil Evidence: Provides chronological data supporting descent with modification; transitional fossils illustrate evolutionary links.
• Phylogenetics: Uses molecular and morphological data to reconstruct evolutionary relationships, emphasizing common ancestry.
• Origin of Life Theories: Include abiotic synthesis (Miller-Urey experiment), formation of protocells, and evolution of metabolic pathways.
• Environmental Influence: Climate, biomes, and ecological interactions shape evolutionary processes and species distribution.

💡 Key Takeaway

Evolutionary principles explain how species change over time through natural selection and genetic variation, resulting in the diversity of life we observe today. Understanding these processes is fundamental to studying biology and the history of life on Earth.

📖 7. Microbial Genetics

🔑 Key Concepts & Definitions

Concept	Definition	Example/Note
Transformation	The uptake and incorporation of free DNA from the environment into a bacterial cell's genome.	Used in genetic engineering to introduce new traits.
Conjugation	The transfer of genetic material between bacteria through direct contact via a pilus.	Facilitates horizontal gene transfer, spreading antibiotic resistance.
Transduction	The transfer of DNA from one bacterium to another via a bacteriophage (virus).	Phage-mediated gene transfer, important in bacterial evolution.
Recombination	The process of exchange or rearrangement of genetic material, resulting in new gene combinations.	Occurs during transformation, conjugation, and transduction.
Chromosomal Mutations	Changes in the structure or number of chromosomes in microbes, affecting genetic information.	Includes deletions, duplications, inversions, translocations.
Operon	A cluster of genes under the control of a single promoter, regulating gene expression in prokaryotes.	lac operon controls lactose metabolism in E. coli.

📝 Essential Points

• Horizontal Gene Transfer (HGT): Microbes acquire genetic material from other organisms via transformation, conjugation, and transduction, promoting genetic diversity.
• Mechanisms of Genetic Exchange:
  • Transformation: Uptake of naked DNA.
  • Conjugation: DNA transfer through a pilus, often involving plasmids.
  • Transduction: Phage-mediated transfer, can transfer chromosomal or plasmid DNA.
• Genetic Mapping & Recombination: Recombination frequency helps determine gene linkage and map gene locations on chromosomes.
• Viruses & Bacteria: Viruses infect bacteria (bacteriophages) and play a key role in transduction.
• Mutations & Variations: Mutations in microbial genomes can lead to new traits, including drug resistance.
• Applications: Microbial genetics underpins biotechnology, including genetic engineering, vaccine development, and antibiotic production.

💡 Key Takeaway

Microbial genetics involves mechanisms like transformation, conjugation, and transduction that facilitate genetic variation and evolution in microbes, forming the basis for many biotechnological applications. Understanding these processes is essential for manipulating microbes for medicine, agriculture, and industry.

📖 8. Plant and Animal Systems

🔑 Key Concepts & Definitions

• Vascular Tissue: Plant tissues (xylem and phloem) responsible for transport of water, nutrients, and food within the plant.
• Primary Growth: Lengthening of plant shoots and roots due to apical meristems.
• Secondary Growth: Increase in girth of plant stems and roots via lateral meristems (vascular cambium and cork cambium).
• Gametophytic Generation: Haploid phase producing gametes in plants.
• Sporophytic Generation: Diploid phase producing spores; dominant in most plants.
• Digestive System: Organs involved in breaking down food, absorbing nutrients, and eliminating waste.
• Circulatory System: System transporting blood, nutrients, gases, and wastes; includes open and closed types.
• Nervous System: Network of neurons controlling body responses; includes central and peripheral components.
• Immune System: Defense mechanism involving innate and adaptive immunity to protect against pathogens.
• Embryonic Development: Process from fertilization through stages like cleavage, gastrulation, and organogenesis.

📝 Essential Points

• Plant Transport: Xylem transports water and minerals; phloem transports organic nutrients.
• Growth & Development: Primary growth involves apical meristems; secondary growth involves lateral meristems.
• Plant Reproduction: Alternation of generations with distinct gametophytic and sporophytic phases; flowering plants develop via gametophyte and sporophyte stages.
• Animal Systems:
  • Digestive System: Includes mouth, esophagus, stomach, intestines, and accessory organs; responsible for nutrient breakdown and absorption.
  • Circulatory System: Types include open (hemolymph) and closed (blood confined to vessels); mammals have a double circulatory system.
  • Nervous System: Comprises central (brain, spinal cord) and peripheral nerves; controls voluntary and involuntary actions.
  • Reproductive System: Structures vary between sexes; involves gamete production, fertilization, and development.
  • Endocrine System: Glands secrete hormones regulating growth, metabolism, and reproduction.
• Immunology:
  • Innate Immunity: Non-specific defense (e.g., skin, phagocytes).
  • Adaptive Immunity: Specific response involving lymphocytes, immunoglobulins, and memory cells.
• Developmental Processes: Fertilization triggers embryonic stages; cellular differentiation leads to tissue formation.

💡 Key Takeaway

Plant and animal systems are intricately designed networks that sustain life through specialized structures and processes, enabling growth, reproduction, and defense. Understanding their organization and functions is fundamental to biology and biotechnology.

📖 9. Biotechniques and Instrumentation

🔑 Key Concepts & Definitions

• Chromatography: A technique for separating mixtures based on differential affinities of compounds for a stationary phase and a mobile phase.
• Centrifugation: Separation of components in a mixture by spinning at high speeds, exploiting differences in density.
• Electrophoresis: Movement of charged molecules through a medium under an electric field, used for DNA, RNA, and protein analysis.
• ELISA (Enzyme-Linked Immunosorbent Assay): A sensitive immunoassay technique for detecting specific antigens or antibodies.
• PCR (Polymerase Chain Reaction): A method to amplify specific DNA sequences exponentially using thermal cycling.
• Spectroscopy: Techniques that measure the interaction of electromagnetic radiation with matter to analyze molecular properties (e.g., UV-Vis, NMR, FTIR).

📝 Essential Points

• Chromatography Types: Includes paper, thin-layer, gas, and liquid chromatography, each suited for different applications.
• Centrifugation: Uses different speeds and durations (e.g., differential, density gradient) to isolate cellular components or molecules.
• Electrophoresis: Commonly used in DNA fingerprinting, protein analysis; agarose gel for nucleic acids, SDS-PAGE for proteins.
• Immunoassays: ELISA and Western blotting are crucial for detecting specific biomolecules; rely on antigen-antibody interactions.
• Molecular Biology Techniques:
  • DNA Cloning: Involves insertion of DNA fragments into vectors (plasmids) using restriction enzymes.
  • PCR: Requires primers, DNA template, nucleotides, and DNA polymerase; essential for gene amplification.
  • DNA Sequencing: Determines the exact nucleotide order; Sanger sequencing is a common method.
• Computational Biology:
  • Bioinformatics: Uses databases and algorithms to analyze genetic sequences and protein structures.
  • Structure Prediction: Secondary and tertiary structures of proteins can be modeled using computational tools.
• Spectroscopy & Instrumentation:
  • UV-Vis Spectroscopy: Measures absorbance of UV or visible light; used for quantifying nucleic acids and proteins.
  • NMR Spectroscopy: Provides detailed information on molecular structure.
  • Mass Spectrometry: Determines molecular weight and structure of compounds.
  • Flow Cytometry: Analyzes physical and chemical characteristics of cells or particles in suspension.

💡 Key Takeaway

Biotechniques and instrumentation are fundamental for analyzing, manipulating, and understanding biological molecules, enabling advances in research, medicine, and industry through precise and efficient tools.

📖 10. Chemistry Fundamentals

🔑 Key Concepts & Definitions

• Atoms: The basic unit of matter, consisting of protons, neutrons, and electrons.
• Chemical Bonding: The force holding atoms together in molecules, including ionic, covalent, and metallic bonds.
• Periodic Table: A tabular arrangement of elements based on atomic number, showing periodic trends in properties.
• Chemical Equilibrium: The state where the forward and reverse reactions occur at equal rates, resulting in constant concentrations.
• Thermodynamics: The study of energy changes, including concepts like enthalpy, entropy, and free energy.
• Kinetics: The study of reaction rates and mechanisms, including factors affecting reaction speed.

📝 Essential Points

• Atomic Structure & Periodicity: Atomic number defines element identity; periodic trends include electronegativity, atomic radius, and ionization energy.
• Bonding & Molecular Interactions: Covalent bonds involve shared electrons; ionic bonds involve electrostatic attraction; intermolecular forces influence physical properties.
• Chemical Reactions & Equilibrium: Reaction rates depend on concentration, temperature, catalysts; Le Chatelier’s principle predicts shifts in equilibrium.
• Thermodynamics & Energy: Spontaneous reactions have negative ΔG; endothermic vs. exothermic processes; high-energy compounds like ATP are vital in biological systems.
• Organic Chemistry: Hydrocarbons, functional groups, stereochemistry, and reaction mechanisms are fundamental to understanding organic reactions.
• Electrochemistry: Redox reactions involve electron transfer; galvanic cells generate electrical energy; electrode potentials predict reaction feasibility.

💡 Key Takeaway

Mastering the fundamental principles of atomic structure, bonding, thermodynamics, and reaction kinetics is essential for understanding chemical behavior and applying this knowledge in biological and industrial contexts.

📖 11. Mathematics for Biotechnology

🔑 Key Concepts & Definitions

• Sequences and Series: Ordered lists of numbers or functions; arithmetic and geometric series are common types used in modeling biological phenomena.
• Limits and Continuity: Fundamental calculus concepts; limits describe the behavior of functions as inputs approach a point, essential for understanding change.
• Differentiation: The process of finding the rate at which a function changes; used to analyze growth rates, enzyme kinetics, and other dynamic biological processes.
• Integration: The inverse of differentiation; used to calculate total quantities such as accumulated biomass or concentration over time.
• Ordinary Differential Equations (ODEs): Equations involving functions and their derivatives; model biological systems like population dynamics and enzyme reactions.
• Probability Distributions: Mathematical functions describing the likelihood of different outcomes; includes normal, binomial, and Poisson distributions, vital for genetic variation and microbial populations.

📝 Essential Points

• Mathematical Modeling: Utilizes functions, differential equations, and probability to simulate biological systems, predict outcomes, and analyze experimental data.
• Limits and Continuity are foundational for calculus, enabling the understanding of instantaneous rates of change in biological processes.
• Differentiation helps determine maximum or minimum points, such as enzyme activity peaks or optimal growth conditions.
• Integration allows calculation of total effects over a range, such as total nutrient uptake or total cell count over time.
• Probability and Statistics are crucial for analyzing experimental data, understanding genetic variation, and modeling stochastic processes in biology.
• Application in Biotechnology: Mathematical tools assist in optimizing fermentation processes, analyzing gene expression data, and designing experiments.

💡 Key Takeaway

Mastery of calculus and probability provides essential tools for modeling, analyzing, and interpreting complex biological systems, thereby advancing research and innovation in biotechnology.

📖 12. Physics Principles

🔑 Key Concepts & Definitions

• Units and Measurements: Standard quantities used to quantify physical properties (e.g., meter, second, kilogram). Accurate measurement is fundamental for experimental physics.
• Motion in One and Two Dimensions: Describes how objects move along a straight line or in a plane, characterized by displacement, velocity, acceleration, and equations of motion.
• Laws of Motion: Newton's laws describe the relationship between the motion of an object and the forces acting upon it:
  • First Law (Inertia): An object remains at rest or in uniform motion unless acted upon.
  • Second Law: Force equals mass times acceleration (F=ma).
  • Third Law: For every action, there is an equal and opposite reaction.
• Work and Energy: Work is done when a force causes displacement; energy is the capacity to do work. Kinetic energy (motion) and potential energy (position) are key forms.
• Conservation of Energy: Energy cannot be created or destroyed; it transforms from one form to another.
• System of Particles and Rotational Motion: Describes the motion of extended bodies, involving concepts like torque, moment of inertia, angular velocity, and angular acceleration.
• Thermal Properties of Matter: Includes heat transfer, specific heat, and laws of thermodynamics (e.g., energy conservation in heat processes).
• Electromagnetism: Encompasses electric charge, electric and magnetic fields, electromagnetic induction, and electromagnetic waves.
• Optics: Study of light behavior:
  • Geometrical optics: Reflection, refraction, lenses, mirrors.
  • Wave optics: Interference, diffraction, polarization.
• Atomic and Nuclear Physics: Deals with atomic structure, radioactivity, nuclear reactions, and properties of nuclei.
• Semiconductor Physics: Behavior of materials like silicon, essential for electronic devices.

📝 Essential Points

• Measurement Accuracy: Precise units and instruments are critical for reliable data.
• Kinematic Equations: Used to solve problems involving uniformly accelerated motion.
• Newton’s Laws Applications: Foundation for analyzing forces, motion, and equilibrium.
• Work-Energy Theorem: Work done on an object equals its change in kinetic energy.
• Conservation Laws: Central to understanding isolated systems; energy and momentum are conserved.
• Rotational Dynamics: Analogous to linear motion but involves angular quantities; torque causes angular acceleration.
• Thermodynamics Laws: First law relates to energy conservation; second law introduces entropy and irreversibility.
• Electromagnetic Phenomena: Electric and magnetic fields are interconnected; changing magnetic fields induce electric currents.
• Optical Principles: Reflection and refraction obey Snell’s law; lenses form images based on focal length and object distance.
• Nuclear Physics: Radioactive decay and nuclear reactions release large amounts of energy, underpinning nuclear power.

💡 Key Takeaway

Mastery of fundamental physics principles—motion, forces, energy, thermodynamics, electromagnetism, and optics—is essential for understanding the natural world and solving complex problems in biotechnology and other sciences.

📊 Synthesis Tables

Feature	Prokaryotic Cells	Eukaryotic Cells
Nucleus	Absent	Present
Organelles	Few, mainly ribosomes	Numerous (nucleus, mitochondria, ER, Golgi, lysosomes)
DNA	Circular, in nucleoid	Linear, in nucleus
Cell Size	Smaller (1-10 μm)	Larger (10-100 μm)
Cell Division	Binary fission	Mitosis and meiosis

Macromolecule	Structure	Function	Example
Proteins	Amino acid polymers	Enzymatic, structural, regulatory	Hemoglobin, enzymes
Nucleic Acids	Nucleotides (DNA, RNA)	Genetic info storage and transfer	DNA, mRNA
Carbohydrates	Monosaccharides, polysaccharides	Energy source, structural	Glucose, cellulose
Lipids	Fatty acids, glycerol	Energy storage, membranes	Triglycerides, phospholipids

⚠️ Common Pitfalls & Confusions

1. Confusing prokaryotic and eukaryotic cell structures, especially the presence of a nucleus.
2. Assuming all enzymes are specific to one substrate; some have broad specificity.
3. Misinterpreting enzyme kinetics; Km is not the reaction rate but substrate concentration at half Vmax.
4. Overlooking the role of allosteric regulation in enzyme activity.
5. Mistaking chromosomal mutations as always lethal; some are neutral or beneficial.
6. Believing inheritance patterns are always simple Mendelian; many traits involve polygenic or linked inheritance.
7. Confusing DNA replication with transcription; replication copies DNA, transcription produces RNA.
8. Assuming all lipids are hydrophobic; phospholipids have hydrophilic heads.
9. Misunderstanding the difference between genotype and phenotype.
10. Overgeneralizing enzyme inhibition types without considering their specific mechanisms.

✅ Exam Checklist

• Identify differences between prokaryotic and eukaryotic cells.
• Describe the structure and function of key organelles.
• Explain the composition and roles of major biochemical macromolecules.
• Illustrate enzyme mechanisms, including substrate binding and catalysis.
• Interpret Michaelis-Menten kinetics and enzyme regulation.
• Describe Mendelian inheritance patterns and exceptions.
• Understand the process of DNA replication and repair mechanisms.
• Summarize principles of evolution, natural selection, and genetic variation.
• Outline microbial genetics concepts, including plasmids and gene transfer.
• Describe plant and animal system organization and functions.
• List common biotechnological techniques and their applications.
• Recall fundamental chemistry concepts relevant to biology.
• Apply basic mathematics to analyze biotech data.
• Explain physics principles relevant to microscopy and molecular interactions.
• Recognize key concepts in biotechnology instrumentation and their uses.