In the ocean, swimming organisms that can move at will in the water column are referred to as
A) periphyton.
B) zooplankton.
C) megaplankton.
D) nekton.
D
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Fucoxanthin is the pigment responsible for the color of
a. brown algae. b. golden algae. c. red algae. d. red algae and golden algae. e. brown algae and golden algae.
When would an atom be least likely to form chemical bonds with other atoms?
A) The number of protons equals the number of electrons. B) The number of protons equals the number of neutrons. C) There is only one electron in the valence shell. D) The valence shell is full of electrons.
The two molecules that alternate to form the backbone of a polynucleotide chain are:a
adenine and thymine. b. cytosine and guanine. c. sugar and phosphate. d. base and sugar. e. base and phosphate
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Stomata rhythm in wheat under continuous light at 25°C.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.