How does the first nucleotide at the 5? end of a new mRNA chain differ from the other nucleotides in the chain?
a. The first nucleotide is always a uracil.
b. The first nucleotide is always a cytosine.
c. The first nucleotide retains its triphosphate group, while the others do not.
d. The first nucleotide does not retain its triphosphate group, while the others in the chain do.
e. The first nucleotide is always a modified cytosine.
c
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Abrupt genetic changes that quickly lead to the reproductive isolation of a group of individuals is
likely to lead to
a. sympatric speciation. b. allopatric speciation. c. extinction. d. mutation. e. anagenesis.
This animal has two atria and one ventricle and
two vascular circuits. This animal is
a. a frog. b. a woodpecker. c. an alligator. d. a rat. e. more than one of these.
Blood leaves each glomerulus in which of the following?
A site of negative genetic regulation where binding by repressor blocks transcription is the
A. operon. B. CAP. C. promoter. D. operator. E. repressor.