The neurotransmitter released at neuromuscular junctions in vertebrates is
A. acetylcholine.
B. serotonin.
C. epinephrine.
D. GABA.
E. endorphin.
A. acetylcholine.
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The optimal pH range for most freshwater fishes and invertebrates is
A. 2 - 6 B. 2 - 4 C. 4 - 6 D. 6 - 9 E. 8 - 11
Ichthyosaurs were extinct aquatic reptiles distantly related to living lizards. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are
A. homologous. B. adaptations to a common environment. C. examples of convergent evolution. D. Three of the responses above are correct. E. Two of the responses above are correct.
In glycolysis, glucose receives two phosphate groups from __________, thus forming fructose-1, 6-
bisphosphate. a. ADP b. ATP c. a bisphosphate group d. fructose-1, 6-bisphosphate e. G3P
If the two alleles for a particular gene are identical the gene pair is Select one:
a. recessive. b. homologous. c. homozygous. d. dominant. e. heterozygous.