Which protein combines with cyclins to exert local control of the cell cycle?
A) phosphatase
B) integrase
C) ATPase
D) hexokinase
E) cyclin-dependent kinase
E
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Most of the mRNA and protein molecules in the zygote are from the ____ because ____
a. mother; the fertilizing sperm contributes essentially no cytoplasm to the zygote b. mother; the fertilizing sperm contributes essentially no DNA to the zygote c. mother; the proteins in the egg degrade mRNA and protein molecules contained in the sperm d. father; the egg contributes essentially no cytoplasm to the zygote e. father; the egg contributes essentially no DNA to the zygote
Which of the following statements about fertilization is FALSE?
a. Fertilization restores the diploid chromosome number. b. Fertilization stimulates the initiation of development. c. Fertilization can determine the sex of the offspring. d. Fertilization permits the formation of gametes with new genetic combinations. e. In fertilization, a sperm fuses with an ovum to produce a zygote
Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called
A. oncogenic. B. latent C. delta agents. D. viroids. E. prions.
Generally, in an infection caused by a DNA-containing virus, the host animal cell supplies all of the following EXCEPT
A) RNA polymerase. B) nucleotides. C) DNA polymerase. D) tRNA. E) None of the answers are correct; all of these are supplied by the host animal cell.