During HIV reproduction, spike glycoproteins
A. are embedded in the infected cell membrane.
B. do not enter the cell with the virus.
C. are released into the cytoplasm by cellular enzymes.
D. are assembled into the virus along with reverse transcriptase.
E. are embedded in the viral capsid.
Answer: B
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If two solutions have unequal concentrations of a solute, the solution with the lower concentration is called
A. isotonic. B. hypertonic. C. hypotonic. D. osmosis.
Tetrad analysis shows that crossing-over occurs at the four-strand stage (i.e., after replication) because, when two genes are linked,
A) NPD > T. B) T > NPD. C) T > PD. D) PD > NPD. E) PD > T.
Data in this figure suggest
A) butterfly populations are declining. B) butterfly habitat is degrading over time. C) butterflies are moving north over time. D) two species of butterflies are evolving over time.
A defect in the HoxA-3 would most likely result in:
A. defects of the lungs. B. defects of the thyroid. C. defects of the limbs. D. abnormal positioning of the kidneys. E. an enlarged heart.