The ultimate fate of the energy used by organisms is ____
a. conversion into heat
b. transmission onto offspring
c. to be recycled repeatedly without loss
d. to be recycled as metabolic energy
e. move into the environment by conduction
ANSWER: a
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Which of the following is capable of phosphorylating key proteins involved in regulating the cell cycle?
A. cyclin B. CDK C. phosphatase D. p53 protein E. cyclin-CDK complex
If you are blood type A,
a. your immune system will recognize blood cells with type B markers as foreign. b. you carry markers for type B blood. c. you can donate blood to a person with type O blood. d. you can receive blood from a person with type AB blood. e. none of these are true.
The type of movement of molecules that is specific and passive, and which becomes saturated if all of the protein carriers are in use is
A. osmosis. B. exocytosis. C. endocytosis. D. active transport. E. facilitated diffusion.
Which sentence describes the width of a DNA double helix?
a. The width is greater where purines are present than where pyrimidines are present. b. The width is narrower where adenine is present than where cytosine is present. c. The width is constant. d. The width varies randomly.