When a plant responds to external stimuli, such as light, gravity, or touch by directional growth, these responses are

referred to as:
a. turgor movements.
b. sleep movements.
c. nastic movements.
d. circadian rhythms.
e. tropisms.


e

Biology & Microbiology

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A purine or pyrimidine that differs in chemical structure from a purine or pyrimidine normally found

in DNA or RNA is called a _____________. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The dominant vegetation of the temperate rain forest includes all of the following except:a

Sitka spruce. b. western red cedar. c. beech. d. Douglas fir. e. western hemlock

Biology & Microbiology

The majority of human DNA does not code for genes.

a. true b. false

Biology & Microbiology

Oxygen atoms gain two electrons when they react. Write the symbol of the ion that results. Is it a cation or anion?

What will be an ideal response?

Biology & Microbiology