Which nitrogenous base would only be found in RNA?
a. adenine
b. thymine
c. cytosine
d. guanine
e. uracil
Ans: e. uracil
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Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown that after the
bacterium enters the root, cells of the root cortex begin to divide in response to ____.
a. a flavonoid released by soybean roots b. nod gene products produced by soybean roots c. nod gene products produced by the bacterium d. nitrogen fixation by the bacterium e. a flavonoid produced by the bacterium
Which cells serve as electrical insulators in the central nervous system?
a. Schwann cells b. oligodendrocytes c. astrocytes d. efferent neurons e. afferent neurons
Which statement about the bacterium shown in the image is true?
a. The bacterium has not begun binary fission.
b. The FtsZ ring has already formed.
c. Two identical chromosomes are present.
d. The nuclear envelope has just dissolved.
What were the long-term responses of each population following the removal of the mice? a. At about year 40, the deer mice population began to re-establish, but then crashed quicklyafter that
b. At about year 40, the deer mice population began to re-establish, and quickly grew back to itsoriginal population size. c. There was no apparent impact on any other population size. d. Both b and c above.