What was the original purpose of sexual reproduction?
A. to become better adapted to a given environment
B. to form more complex organisms
C. to repair damaged DNA
D. All of the choices are correct.
Answer: C
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One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. <1,000 Daltons B. >1,000 Daltons, but <1,500 Daltons C. >10,000 Daltons D. >5,000 Daltons, but <10,000 Daltons E. >1,500 Daltons, but <5,000 Daltons
Ecology is:
a. a type of life style. b. the study of the interaction of organisms and their environment. c. a place where organisms live. d. what happens when a predator consumes a prey item. e. the study of the physical environment in an ecosystem.
Which of the following words describes a
tentative explanation to a given question?
a. law b. theory c. hypothesis d. fact e. principle
A cell cycle checkpoint at which phase would ensure sufficient nutrients for cell division were available?
a. S b. prophase c. metaphase d. G1 or G2 e. G1 or S