Cravon Rogers Jr.
BIO 101.005
Dr. Nyaga
March 9, 2015
Lab 4 Cells
Pre-Lab
List the pages in your textbook that relate to this experiment:
Pages 204-212
What is the main difference between prokaryotic and eukaryotic cells?
Prokaryotic cells do not have organelles.
State the function of mitochondria, chloroplasts, nuclei, and lysosomes.
Mitochondria facilitate aerobic cellular respiration, chloroplasts is where photosynthesis occurs, nuclei holds the cell’s genetic material, and lysosomes recycle and break down macromolecules.
What is the evidence for endosymbiosis?
The similar size and composition shows that mitochondria were initially a bacteria. Mitochondria were engulfed. The aerobic heterotrophic bacteria were kept inside a larger, heterotrophic eukaryotic cell by endosymbiosis. Chloroplasts also arose by endosymbiosis. Photosynthetic bacteria were engulfed y aerobic eukaryotes.
Do plant cells have mitochondria? Plant cells have mitochondria.
Compare and contrast a typical plant cell and an animal cells?
Animal cells don’t have a cell wall, chloroplasts, and a vacuole.
Post-Lab
Why did you not observe chloroplasts in the onion epidermis?
The clear epidermal cells consist of a single layer and do not contain chloroplasts because the onion fruiting body is used for storing energy not photosynthesis.
What is the function of cell walls? Name the cells which did not have cell walls? Why did the Paramecium not have a cell wall? How do antibiotics attack cell walls of bacteria? Why do they not kill fungi?
Cell walls protect the cell and provide structural support. Animal and bacterial cells didn’t have a cell wall. The paramecium cell did not have a cell wall because it is a bacterium. Antibiotics attack cell walls of bacteria from the inside out disintegrating the cell wall to keep it from rebuilding. Antibiotics don’t kill fungi because they