Micronutrients function in plants mainly as
A) joining elements in organic molecule carbon skeletons.
B) regulators of membrane transport.
C) cofactors in chemical reactions.
D) food reserves for pollen grains.
Answer: C
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The sweetener aspartame is a known excitotoxin. With regard to nerve cells, ingestion of this substance results in chronic nerve stimulation. With your knowledge of action potentials, this toxin must
A) stimulate continual impulses at the cell body. B) stimulate continual impulses at the dendrite. C) bind the nodes of Ranvier. D) block the synaptic cleft. E) stimulate continual impulses at the presynaptic receptors.
A tautomer is
A) a mutagen. B) an RNA base. C) an alternate structure of a molecule. D) the type of bond that holds DNA bases together.
The bulging of a(n) _____ during the contraction of the ventricles is referred to as the _____
a. arteriole; pulse b. artery; blood pressure c. arteriole; blood pressure d. artery; pulse e. vein; pulse
The molecule mRNA, which contains the information to make a polypeptide, is constructed from a DNA template.
Answer the following statement true (T) or false (F)