Which of the following is NOT a component of DNA?

a. deoxyribose
b. phosphate
c. adenine
d. uracil
e. guanine


ANSWER: d

Biology & Microbiology

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Differences in domesticated animals over relatively short periods of time most likely occur through:

A. natural selection B. artificial selection C. adaptation D. experimental selection E. evolution

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To process information, postsynaptic neurons often add up simultaneous signals from several presynaptic neurons. Which structure and process allow them to do so?   A.  axons; temporal summation

A.  axons; temporal summation B.  axons; spatial summation C.  dendrites; temporal summation D.  dendrites; spatial summation

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The inferior vena cava moves blood from the ____

a. head only b. forelimbs only c. head and forelimbs d. abdominal organs only e. abdominal organs and hind limbs

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Post-translational controls of gene expression

include a. activation of enzymes. b. inhibition of enzymes. c. stabilization of enzymes. d. allosteric enzyme control. e. all of these

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