An agar block filled with auxin is placed on top of a shoot that has had the shoot tip removed. The agar block is placed
so that it covers only one side of the top of the shoot. You would expect the shoot to ____.
a. stop growing
b. grow faster on the side away from the agar block
c. grow straight up
d. grow faster on the side with the agar block
e. grow faster on both the side away from the agar block and on the side with agar block
ANSWER: d
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A researcher uses a probe complementary to the gene of interest and performs a colony hybridization experiment on a plate containing many bacterial colonies. Each bacterial colony contains a recombinant vector with a different piece of chromosomal DNA. What can be learned from this experiment?
A. The researcher can determine the level of expression for each gene represented. B. The researcher can identify colonies that contain the gene of interest. C. The researcher can identify colonies that have not taken up a vector. D. The researcher can determine the amount of mRNA in a specific colony. E. The researcher can determine the amount of DNA in each of the colonies.
Which group of primates includes the lemurs and lorises?
1.Anthropoidea 2.Haplorhini 3.Hominoidea 4.Strepsirhini
Land vertebrates evolved which of the following to
help maintain water balance? a. circulatory system b. thyroid c. kidneys d. liver e. none of these
A trend toward the decrease in the size of plants on the slopes of mountains as altitudes increase is an example of
A) a cline. B) a bottleneck. C) relative fitness. D) genetic drift. E) geographic variation.