What is the function of the MutS protein in methyl-directed mismatch repair?
A. to excise the mismatched base pair
B. to make a cut in the nonmethylated DNA strand
C. to digest the nonmethylated DNA strand
D. to directly bind the DNA polymerase
E. to find mismatches
Answer: E
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Island populations are more vulnerable to
__________ than their mainland counterparts. a. storms b. disease c. droughts d. genetic drift e. all of these
Gastrin is a hormone secreted by the ________
Fill in the blank(s) with correct word
What commercial product is derived from the processing of red algae?
a. milk b. sushi c. lipstick d. ice cream e. carrageenan
The endosymbiont theory is an explanation for some of the changes that occurred between the earliest cells on Earth and current cells on Earth. This theory, which is supported by a vast amount of scientific evidence, explains that mitochondria and chloroplasts had their origins as free-living organisms that were later incorporated into cells. How might further evidence change this theory?
A) If more evidence supports the endosymbiont theory, it will become a scientific hypothesis. B) If more evidence supports the endosymbiont theory, it will become a scientific law. C) Evidence that does not support the theory will be disregarded because theories cannot be revised. D) Evidence that does not support the theory could cause the theory to be revised