In DNA, a purine must always pair with a pyrimidine and vice versa in order to ensure that
A. each base pair is held together by three hydrogen bonds.
B. the distance between the two phosphodiester backbones remains constant.
C. the two strands are antiparallel.
D. the distance between one base pair and the next remains constant.
Answer: B
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The cardiovascular system consists of the ________ and ________
Fill in the blank(s) with correct word
During translation, translocation refers to
A. joining a tRNA molecule to the ribosome. B. moving the ribosome along the mRNA molecule. C. releasing a tRNA molecule from the ribosome. D. joining an amino acid to the next amino acid in the chain. E. joining an amino acid to a tRNA molecule.
List the four basic characteristics of chordates. .
What will be an ideal response?
Comb-jellies are similar to bilaterians in that they (select all that apply):
A. have a "flow-through" gut with both a mouth and an anus. B. develop muscle cells from a rudimentary mesoderm. C. have an anterior-posterior body axis. D. use acetylcholine as a neurotransmitter. E. none of these.