Meiosis is to gametes as fertilization is to
A. mitosis.
B. sperm.
C. egg.
D. zygote.
E. chromosome.
Answer: D
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Which one of the following statements about the methylation state of CpG islands is incorrect?
A. Cells can heavily methylate CpG islands of viral DNA sequences in order to restrict their expression. B. Cancer cells often methylate CpG islands in genes that could restrict cell growth. C. The methylation state of CpG islands provides a way to turn genes on or off. D. The methylation state of CpG islands is rigid and will not change over time. E. The methylation state of CpG islands can change in response to the environment.
The movement of NH4
+ ions into a cell down an electrochemical gradient (where, when compared to the outside of the cell, the inside of the cell has less NH4 + ions) is best described as an example of
a. symport. b. passive diffusion. c. antiport. d. facilitated diffusion. e. active transport.
Protein filaments that function in muscular contraction are
A. keratin and actin. B. myosin and collagen. C. elastin and collagen. D. actin and myosin. E. elastin and keratin.
Which of the following is a zone of decomposition?
A) forest canopy B) photic zone C) forest floor D) kelp forest