In most eumetazoans the outermost tissue layer during development is the
a. mesoderm.
b. epiderm.
c. mesoglea.
d. endoderm.
e. ectoderm.
E
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In what stage of translation does the peptide bond join two amino acids?
a. initiation b. transcription c. elongation d. reparation e. termination
Echinoderms are unusual invertebrates as they have all of the following except:a
an endoskeleton. b. pentaradial symmetry. c. a water vascular system. d. pedicellariae present in some classes. e. small disc-shaped flat bodies.
What factor most influences the dry deserts of Nevada?
A) the hot desert sun B) the Pacific Ocean C) overgrazing by livestock D) the rain shadow from a California mountain range
In somatic cells, if a base is mismatched in one new daughter strand during DNA replication, and is not repaired, what fraction of the DNA duplexes will have a permanent change in the DNA sequence after the second round of DNA replication?
(a) 1/2 (b) 1/4 (c) 1/8 (d) 1/16