The transfer of energy directly from a photoexcited electron in a pigment molecule to another electron in an adjacent pigment molecule occurs by
A) photoexcitation.
B) photochemical reduction
C) photophosphorylation.
D) resonance energy transfer.
E) photorespiration.
Answer: D
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What might happen to your red blood cells if you were suddenly unable to regulate the solute concentration of your blood and it began to rise?
A. Your blood cells would shrivel because water would move out of the cells via osmosis. B. Your blood cells would stay the same size. C. Your blood cells would enlarge and could rupture because water would move into the cells via osmosis. D. We do not have enough information to answer this question.
Archaeopteris belongs to the now-extinct lineage of seedless vascular plants called ____, and is proposed to be the
possible ancestor of gymnosperms.
a. Charophyta b. Monilophyta c. Lycophyta d. proangiosperms e. progymnosperms
In the northeastern Pacific ocean, sea otters occur at a relatively low abundance. By preying upon sea urchins, sea otters maintain underwater kelp (large algae) "forests", which would otherwise be decimated by the herbivorous sea urchins. The kelp forests supply food for a wide variety of marine organisms, as well as providing refuge from predation and nursery habitat for juveniles. Based on this, what type of species best describes sea otters?
A. umbrella species B. dominant species C. flagship species D. indicator species E. keystone species
The oldest fossils of eukaryotes have been estimated to be
A. 1995 years old. B. 4.5 billion years old. C. 1.5 billion years old. D. 6000 years old. E. 8 billion years old.