Organization of Living Things

📋 Course Outline

1. Classifying Living Organisms
2. Microscopes and Cellular Observation
3. Unicellular Organisms
4. Eukaryotic and Prokaryotic Cells
5. Organization of Multicellular Organisms
6. Extracellular Matrix and Tissues
7. Discovery and Role of the Nucleus
8. DNA Structure and Information

📅 Key Dates

1. 1831Robert Brown discovered a spherical organelle at the center of plant cells using a microscope.
2. 1835Rudolf F. J. Wagner observed the nucleus of animal cells. — Rudolf F.J.H. Wagner, 1835
3. 25 April 1953Francis Crick and James Watson first described the structure of DNA based on Rosalind Franklin's research.

📖 1. Classifying Living Organisms

📝 Essential Points

📌 Living organisms may be classified by size or by number of cells; this course uses the distinction between unicellular organisms, made of one cell, and multicellular organisms, made of several cells.

• Yeasts and euglenas are unicellular organisms, whereas trees, humans, and zebrafish are multicellular organisms.

• The vital functions are:

  • grow
  • obtain nutrients
  • reproduce
  • defend themselves

💡 Memory Hook