When two viruses infect a cell at the same time, there is a possibility of gene exchange between the two. This is called:
a. gene swapping
b. horizontal gene transfer
c. viral exchange
d. viral recombination
e. conjugation
d
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What does the term theory mean to a scientist?
A. A proposed explanation for an observed phenomenon B. A hypothesis that has been supported by a large number of experiments C. A hypothesis that has been supported by the evidence of one experiment D. A guess
Glucose is transported into a cell by ____
a. active transport b. exocytosis c. facilitated diffusion d. phagocytosis e. osmosis
Which of the following is found at the 5' end of a DNA strand?
A) a phosphate group B) a hydrogen bond C) a hydroxyl group D) histones E) a methyl group
Which of the following is an example of commensalism?
A. Wood-digesting flagellates living in the gut of termites B. A female mosquito sucking blood from a musk oxen C. Barnacles hitching a ride on the skin of a whale D. Acacia trees and their ants E. A tapeworm living in the intestines of a mule deer