All of the following have bilateral symmetry except:

a. Nemertea.
b. Phoronids.
c. Ctenophora.
d. Platyhelminthes.


C

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology