The West Nile virus is classified as a(n)
A. rhinovirus.
B. coronavirus.
C. togavirus.
D. flavivirus.
E. enterovirus.
Answer: D
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Cell extension involves
A. loss of water. B. low acidic condition. C. enzymes that produce polysaccharides. D. expansion of cellulose microfibrils. E. water leaving the central vacuole.
Which of the following assembles a short RNA chain as the first nucleotides in a new DNA strand?
a. topoisomerase b. primase c. DNA polymerase d. helicase e. DNA ligase
The transfer of pollen from an anther to the stigma of a carpel is
A. fertilization. B. coevolution. C. germination. D. pollination.
The p53 protein is critical to the regulation of the cell cycle because it
a. halts cell division when necessary, allowing the cell to repair damaged DNA. b. causes cells with heavily damaged, unrepairable DNA to commit “suicide.” c. prevents the cell from dividing at inappropriate times. d. all of the above