What is the main difference between a virulent and temperate bacteriophage?
What will be an ideal response?
ANSWER: A virulent phage kills its host with each infection cycle. A temperate phage might also kill
the host, but it can also enter an inactive phase in which its viral DNA integrates into the host
cell’s chromosome.
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Populations of all organisms change from one generation to the next because their DNA changes over
time. This is known as:
a. artificial selection. b. biological evolution. c. natural selection. d. artificial selection and natural selection only e. developmental selection.
If fertilization does not occur, what happens to the levels of estrogen and progesterone?
a. Both estrogen and progesterone increase. b. Estrogen increases, while progesterone decreases. c. Both estrogen and progesterone decrease. d. Progesterone increases, while estrogen decreases.
In animal skeletal muscles, white muscle fibers
a. have an abundance of myoglobin. b. make ATP by lactate fermentation. c. produce ethanol. d. are good for sustained activities. e. are not found in chickens
The significance of one new and one parental strand in each new DNA molecule would be that:
1.New strands are more susceptible to mutation.
2.DNA polymerase will only work on a parental strand.
3.Having an original strand is needed to prevent errors during the replication process.
4.Strands can only pair with existing strands.