All of the following have bilateral symmetry except:
a. Nemertea.
b. Phoronids.
c. Ctenophora.
d. Platyhelminthes.
C
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Why is the pharmacological reactivation of fetal hemoglobin in a patient with sickle-cell anemia often a successful treatment? Fetal hemoglobin _____
A) binds more carbon dioxide molecules than adult hemoglobin B) is better able to release oxygen than is adult hemoglobin C) has a higher affinity for oxygen than does adult hemoglobin D) is better able to release carbon dioxide than is adult hemoglobin E) has a higher affinity for carbon dioxide than does adult hemoglobin
In the process of glycolysis, glucose is cleaved into a pair of three-carbon ________ molecules.
A. acetyl CoA B. lactate C. oxaloacetate D. pyruvate E. alcohol
Neurotransmitters like acetylcholine
A. are released from axons. B. travel from dendrite to axon. C. are released from dendrites. D. travel from the soma to the dendrites.
A base substitution that changes a codon coding for an amino acid to a stop codon is called a
a. frameshift mutation. b. missense mutation. c. silent mutation. d. nonsense mutation.