Which of the following causes the unwinding of the DNA double helix?
a. DNA polymerase
b. DNA helicase
c. RNA primer
d. primosome
e. RNA polymerase
B
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Why must the life cycle of sexually reproducing species alternate between haploid and diploid stages?
A. Meiosis must occur at some point in the life cycle to prevent a doubling of chromosomes in each generation. B. Mitosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. C. The diploid stage allows for genetic recombination. D. Meiosis must occur at some point in the life cycle to prevent a reduction of chromosomes in each generation. E. Haploid cells cannot grow independently of diploid cells.
Both DNA and RNA can store information, yet DNA is the major information storage molecule in most cells. What are the advantages of using DNA for information storage instead of RNA?
A. DNA strands are less likely to spontaneously break because of the hydrogen bonds between bases. B. If DNA stored information for the synthesis of RNA, RNA could be freed up for enzymatic functions. C. Cells with both DNA and RNA would have an advantage over cells with just RNA, because DNA does not spontaneously break and RNA could carry out enzymatic functions. D. Reverse transcriptase could occur and DNA could make RNA. E. DNA could be used to make proteins directly.
A man is locked in a small room with a limited supply of oxygen. There is one other animal in
the room with him. Which of the following organisms would ensure the longest survival time for the man and thus enhance his chances of rescue?
a. 300-kg gorilla b. 5-g mouse c. 150-kg Galapagos tortoise d. 6-g lizard
Replicating early Earth conditions in the lab, the Miller experiment created from inorganic chemicals
a. life. b. artificial proteins. c. DNA. d. simple molds. e. amino acids.