Which of the following is a condition in which a person inherits an extra copy of a chromosome?
A) monosomy
B) disjunction
C) trisomy
D) inversion
E) duplication
Answer: C) trisomy
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Cell signaling between two nerve cells is an example of paracrine signaling because:
A. a signaling molecule (neurotransmitter) is released. B. a receptor is activated. C. the cells are in close proximity. D. the responding cell releases more signaling molecule (neurotransmitter).
The decoding function is conducted by
A. the 16S rRNA B. tRNA. C. mRNA. D. snRNA. E. aminoacyl-tRNA synthetase.
In invertebrates with open circulatory systems, hemolymph is composed of:
A. interstitial fluid. B. plasma plus interstitial fluid. C. plasma plus intracellular fluid. D. plasma.
During synaptic transmission across a typical synapse, which action occurs?
A) Sodium ions flow into the membrane of the presynaptic neuron. B) The binding of neurotransmitters triggers the release of potassium ions by the presynaptic neuron. C) Vesicles containing neurotransmitter molecules diffuse to the receiving neuron's plasma membrane. D) Neurotransmitter molecules bind to receptors on the postsynaptic membrane.