Proton pumps are used in photosynthesis
A. to pump protons into the thylakoid.
B. between photosystem II and photosystem I.
C. during the light-dependent reaction sequence.
D. All of the choices are correct.
D. All of the choices are correct.
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In meiosis I, cytokinesis usually occurs after telophase I and produces
A. one diploid cell. B. one haploid cell. C. four haploid cells. D. two diploid cells. E. two haploid cells.
A great adaptive radiation of mammals began about
__________ million years ago. a. 25 b. 65 c. 95 d. 125 e. 165
Four of the five answers listed below are related by a similar source. Select the exception
a. prolactin b. progesterone c. androgen d. estrogen e. testosterone
Mutations affect Hardy-Weinberg equilibrium by
A. allowing gene flow to increase. B. keeping allele frequencies unchanged between generations. C. decreasing the genetic variation that affects natural selection. D. altering frequencies of particular alleles within a population.