Four of the five answers listed below are layers of the digestive tract. Select the exception
a. peritoneum
b. mucosa
c. serosa
d. submucosa
e. muscle layer
A
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How do scientists determine the annealing temperature used in PCR reactions?
a. It is always 55?C because the DNA polymerase works best at this temperature. b. It is always 55?C because primers anneal best at lower temperatures. c. It is always 60?C because any other temperature would destabilize the DNA. d. It can vary from 55-60?C depending on the primers being used. e. It can vary from 55-60?C depending on the type of DNA polymerase being used.
These results indicate which of the following?
A) Brown is dominant to black. B) Black is dominant to brown and to yellow. C) Yellow is dominant to black. D) There is incomplete dominance. E) Epistasis is involved.
Speciation often occurs when a habitat becomes more heterogeneous. In Lake Victoria different species of cichlids are found in different areas of the lake. The best explanation for this speciation is that
A) natural selection favored different heritable variations in different parts of the lake. B) male cichlids that lived in deep water needed to be seen by females, so they became colorful. C) food was scarce in the lake, so some fish had to learn how to scrape algae, some had to learn to eat insects, and some had to learn to bite leaves. D) humans selected for many different traits in cichlids in order to market them to the aquarium trade.
The "synthesis" part of photosynthesis is the Calvin cycle, which occurs in the:
A) thylakoids. B) stroma. C) stomata. D) chlorophyll molecules. E) electron transport chain.