If Meselson and Stahl let replication proceed for one more round of replication (3 rounds) what fraction of the daughter DNA molecules would be of intermediate density?
A: None
B: ½
C: ¼
D: 1/8
Ans: C: ¼
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GGG and GGC are codons for the amino acid, glycine. A mutation caused the insertion of a cytosine in place of the guanine during DNA replication. Over many generations the DNA changes so that the frequency of GGC is similar to that of GGG. What is this phenomenon called?
A. directional selection
B. bottleneck effect
C. stabilizing selection
D. adaptive variation
E. neutral variation
In an apple seedling, what is the function of a lateral meristem?
a. increasing the diameter of stems b. protecting new leaves and shoots c. discouraging predatory animals d. ensuring regular seed production
Leptin has its effect on the
a. small intestine. b. stomach. c. brain. d. skeletal muscles. e. liver.
The per capita growth rate (r) is ____ per mouse per month in a population of 1,000 mice where 500 mice are born
and 400 mice die monthly. a. 0.1 b. 0.2 c. 0.3 d. 0.4 e. 0.5