Which of the following sugars is found in

RNA and NOT in DNA?



a. glucose
b. deoxyribose
c. deoxyribulose
d. ribose
e. ribulose


D

Biology & Microbiology

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Which of the following amino acids is/are negatively charged at physiological pH?

A. serine B. aspartate C. glutamate D. serine, aspartate, and glutamate E. aspartate and glutamate

Biology & Microbiology

The increased mortality of coniferous trees in the Pacific Northwest between 1955 and 2007 is an example of a

reaction to ____.

a. density-independent factors b. density-dependent factors c. predation d. crowding e. population growth

Biology & Microbiology

The skin of sharks is covered with scales called:

a. placoid. b. cycloid. c. ctenoid. d. ganoid. e. circular.

Biology & Microbiology

Once a threshold is reached,

a. the number of sodium gates that open depends upon the strength of a stimulus. b. a graded local potential will be unable to spread to a trigger zone of the nerve membrane. c. the resting potential of a neuron is restored. d. the potassium channels in the input zone open. e. the opening of sodium gates and the accompanying flow of sodium ions is an example of positive feedback.

Biology & Microbiology