Approximately ____ Y-linked genes have been discovered
a. 10
b. 20
c. 60
d. 80
e. 120
c
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Forming skill memories through repetition of an activity such as riding a bike, involves the ____, which controls motor activity
a. cerebellum b. medulla oblongata c. cerebrum d. hippocampus e. hypothalamus
A microbial geneticist observes that a significant number of pyrimidine dimers are present in bacterial DNA following exposure to a particular mutagen. To which mutagen were the bacterial cells likely exposed?
A. UV light B. X-rays C. Acridine orange D. 5-bromouracil
The ____________ of the blood is due to the presence of unfiltered plasma proteins. This pressure pulls fluid back into the capillaries by osmosis.
Fill in the blank(s) with the appropriate word(s).
How can researchers confirm that phloem moves from a source to a sink?
A. They can use radioactive tracers to measure the flow of sap between two distances over time. B. They can study the cause of maple sap flow in producing syrup. C. They can observe the uptake of ink into the stem of celery. D. They can observe aphids and cut off their beaks. E. They can observe the effects of girdling a tree below the level of the majority of leaves.