Hoja de repaso: Fundamentals of Cell Biology and Physics

📋 Course Outline

1. Animal and plant cell structures
2. Cell respiration and energy release
3. Photosynthesis equation and chlorophyll
4. States of matter and particle movement
5. Elements, compounds, mixtures and pH indicators
6. Forces, speed formula and energy transfer

📖 1. Animal and plant cell structures

🔑 Key Concepts & Definitions

• Animal cell : Animal cell : A cell type with nucleus, cytoplasm, cell membrane, and mitochondria.
• Plant cell : Plant cell : A cell type that includes all animal-cell parts plus cell wall, chloroplasts, and vacuole.
• Nucleus : Nucleus : The cell part that controls cell activities.
• Mitochondria : Mitochondria : The cell part that releases energy during respiration.

📝 Essential Points

• Animal cells include nucleus, cytoplasm, cell membrane, and mitochondria.
• Plant cells include everything in animal cells plus cell wall, chloroplasts, and vacuole.
• Chloroplasts are found in plants only and carry out photosynthesis.
• Nucleus controls the cell, while mitochondria are linked to energy release.
• Vacuole is a plant-cell feature (not listed for animal cells).

💡 Memory Hook

Plant = Animal + extras: wall + chloroplasts + vacuole.

📖 2. Cell respiration and energy release

🔑 Key Concepts & Definitions

• Cell respiration : Cell respiration : A process in living cells that breaks down glucose using oxygen to release energy.
• Glucose : Glucose : A sugar used as a fuel in respiration.
• Oxygen : Oxygen : A gas used in respiration to help release energy.

📝 Essential Points

• Respiration happens in all living cells.
• Word equation: glucose + oxygen → carbon dioxide + water + energy.
• Energy from respiration supports movement, growth, and repair.
• Respiration releases energy rather than storing it as a long-term fuel.
• Carbon dioxide and water are produced during respiration.

💡 Memory Hook

Respiration: glucose + oxygen → CO2 + water + energy.

📖 3. Photosynthesis equation and chlorophyll

🔑 Key Concepts & Definitions

• Photosynthesis : Photosynthesis : A process in leaves that uses light energy to make glucose and release oxygen.
• Chlorophyll : Chlorophyll : A pigment that absorbs sunlight for photosynthesis.
• Leaves : Leaves : Plant parts where photosynthesis happens.

📝 Essential Points

• Photosynthesis happens in leaves.
• Word equation: carbon dioxide + water → glucose + oxygen (light + chlorophyll needed).
• Chlorophyll absorbs sunlight to power the reaction.
• Oxygen is released as a product of photosynthesis.
• Glucose is produced as the main sugar product for plants.

💡 Memory Hook

Photosynthesis needs: CO2 + water + light + chlorophyll → glucose + O2.

📖 4. States of matter and particle movement

🔑 Key Concepts & Definitions

• Solid : Solid : A state of matter with a fixed shape.
• Liquid : Liquid : A state of matter with a fixed volume.
• Gas : Gas : A state of matter with no fixed shape or fixed volume.
• Particle movement : Particle movement : How particles behave in a substance, changing with temperature.

📝 Essential Points

• When heated, particle movement increases.
• Solids have a fixed shape.
• Liquids have a fixed volume.
• Gases have no fixed shape or fixed volume.
• Solid → liquid → gas describes the order of states as heating occurs.

💡 Memory Hook

Heat → particles move more; solid shape fixed, liquid volume fixed, gas none.

📖 5. Elements, compounds, mixtures and pH indicators

🔑 Key Concepts & Definitions

• Element : Element : A substance made of one type of atom.
• Compound : Compound : A substance where elements are chemically bonded together.
• Mixture : Mixture : A substance where components are not chemically bonded.
• pH indicator : pH indicator : A substance that changes colour depending on the pH of a solution.

📝 Essential Points

• Example of an element given: oxygen.
• Example of a compound given: water (H2O).
• Example of a mixture given: air.
• Acids have pH below 7.
• Alkalis have pH above 7 and neutral solutions have pH 7.

💡 Memory Hook

pH: acid < 7, neutral = 7, alkali > 7.

📖 6. Forces, speed formula and energy transfer

🔑 Key Concepts & Definitions

• Force : Force : An interaction that can change motion and is measured in newtons.
• Speed : Speed : How fast an object moves, calculated from distance and time.
• Energy transfer : Energy transfer : The movement of energy from one form or object to another.
• Kinetic energy : Kinetic energy : Energy associated with movement.

📝 Essential Points

• Forces are measured in newtons (N).
• Speed formula: speed = distance ÷ time.
• Speed units include m/s or km/h.
• Energy is never created or destroyed, only transferred.
• Energy forms listed include kinetic, thermal, chemical, and electrical.

💡 Memory Hook

Speed = distance ÷ time; Energy: never created/destroyed, only transferred.

📊 Synthesis Tables

States of matter comparison

State	Shape	Volume
Solid	Fixed	Fixed
Liquid	Not fixed	Fixed
Gas	Not fixed	Not fixed

⚠️ Common Pitfalls & Confusions

1. Mixing up pH ranges: acids are below 7 and alkalis are above 7.
2. Thinking plant cells lack chloroplasts; chloroplasts are plant-only in this course.
3. Forgetting that respiration happens in all living cells, not just plants.
4. Using the wrong speed formula; it is distance ÷ time.
5. Assuming energy can be created or destroyed; it is only transferred.

✅ Exam Checklist

1. Identify key parts of animal and plant cells and state the plant-only structures.
2. Write and explain the word equation for respiration and state where it happens.
3. Write the word equation for photosynthesis and state what light and chlorophyll do.
4. Match solid, liquid, and gas to fixed shape/volume and describe how heating affects particle movement.
5. Classify substances as element, compound, or mixture using bonding ideas and given examples.
6. Use pH values to label acids, neutral solutions, and alkalis and state how indicators behave.
7. Recall force units (N), the speed formula and units, and the rule about energy being transferred only.