Which of the following statements about cancer is FALSE?
A. It is characterized by uncontrolled cell division.
B. Over 1 million Americans are diagnosed with cancer each year.
C. Most cancers involve genetic changes that are passed from parent to offspring.
D. At least 80% of all human cancers are related to exposure to carcinogens.
E. It is caused by an accumulation of mutations.
C. Most cancers involve genetic changes that are passed from parent to offspring.
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The RNA world proposal suggests that the first information molecules were ____
a. transfer RNA b. ribosomes c. messenger RNA d. ribozymes e. unpaired strands of DNA
Which mammals do NOT exhibit seasonal sexual
activities? a. whales b. cats c. some primates d. horses e. dogs
The process illustrated in Figure 36-2 is known as:
a. humus formation. b. weathering. c. cation exchange. d. soil erosion. e. salinization.
What evolutionary role is served by the redundancy of the genetic code? What will be an ideal response?