Download Biology III Homework Due 5/1/12 1. Which of the following describes

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Biology III
Homework Due 5/1/12
1. Which of the following describes plant cells but not animal cells?
A. The nucleus contains the chromosomes.
B. The ribosomes assist in protein synthesis.
C. Plastids store starch made during photosynthesis.
D. Mitochondria produce energy through respiration.
2. Some cells, such as human nerve and muscle cells, contain many more mitochondria than do
other cells, such as skin cells. Why do some cells have more mitochondria than others?
A. The cells use more energy.
B. The cells store more nutrients.
C. The cells degrade more proteins.
D. The cells divide more frequently.
3. Cyanide is a powerful poison because it inhibits an enzyme in mitochondria, preventing the
transfer of energy during one of the steps in cellular respiration. This poison would directly
affect the production of which of the following molecules?
B. glucose
C. oxygen
4. Many animals have internal or external skeletons that provide support and structure. Which of
the following parts of plant cells play a similar role?
A. cell membranes
B. cell walls
C. chloroplasts
D. cytoplasm