p53 is often referred to as the “guardian of the genome” by cancer research scientists. According to the diagram, which action by p53 explains its reputation?
a. Mutated p53 results in cancer.
b. p53 can trigger apoptosis.
c. p53 arrests the cell cycle if there is DNA damage.
d. p53 monitors the supply of oxygen in the environment.
c. p53 arrests the cell cycle if there is DNA damage.
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A. true B. false
Which of the following vertebral column levels has the thickest intervertebral disc?
A) between T12 and L1 B) between C7 and T1 C) between C1 and C2 D) All of the answers are correct. E) None of the answers are correct.
Which of the following is not a factor that weakens host defenses against infections?
A. Old age B. Chemotherapy C. Physical and mental stress D. Genetic defects in immunity E. Strong, healthy body
The plant in row b of Figure 38-2 demonstrates a photoperiodic response characteristic of:
a. short-day plants. b. day-neutral plants. c. long-day plants. d. long-night plants. e. intermediate-day plants.