Production of the iron-storing protein ferritin is regulated by aconitase, which binds to a 30-nucleotide sequence at the beginning of the ferritin mRNA and interferes with ribosome binding. Aconitase must be a
A. transcription repressor protein.
B. RNA interference protein.
C. translation initiation protein.
D. translation repressor protein.
Answer: D
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The last step of aerobic respiration is referred to as which of the following?
a. the Calvin Cycle b. the Krebs Cycle c. oxidative phosphorylation d. the citric acid cycle
Aquaporins are
a. cells that are specialized for water transport. b. transport channels for water. c. the entry point of filtrate into a nephron. d. transport channels for ions. e. the exit channel for urine out of a nephron.
Which of the following carbohydrates form
highly branched chains of glucose monomers?
a. glycogen b. cellulose c. fructose d. starch e. sucrose
Consider the contribution of NADH and FADH2. How many of the 38 total ATP molecules produced in cellular respiration come from the citric acid cycle?
a. 20 b. 22 c. 28 d. 32