2. what is an enzyme, and what is its role in a reaction? 3. compare and contrast prokaryotic and eukaryotic cells. 4. describe some of the organelles that are found in a eukaryotic cell. 5. what are some differences between plant and animal cells? biology dba guide 6. what is an atp molecule, and why is it important? 7. what is the function of cellular respiration? 8. compare fermentation and cellular respiration. 9. compare photosynthesis and cellular respiration. 10. describe what happens during photosynthesis. additional honors questions: 11. what are the two main functions of polysaccharide molecules in living organisms, and how do their structures relate to these functions? 12. what is the endosymbiotic theory?

An enzyme is a protein catalyst that lowers the activation energy required to undergo a chemical reaction, which speeds up the rate of reaction.

A prokaryotic cell does not contain a nucleus, while a eukaryotic cell does contain a nucleus.

In eukaryotic cells, a nucleus holds the cell's DNA. Ribosomes is the site of protein synthesis. Cell membrane acts as a layer of protection for the organelles. The cytoplasm holds the cell's shape and suspends the organelles within the cell.

Plant cells contain chloroplast, chlorophyll, and a cell wall. Animal cells contain centrioles.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.