Based on the figure, which of the following is true of HIV?
A. It uses reverse transcriptase from the cell to make DNA.
B. It replicates in the nucleus of cells.
C. It contains DNA as its genetic material.
D. It is an enveloped virus.
E. It lyses cells when it is released.
D. It is an enveloped virus.
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The proton motive force is most often generated by splitting of H2
Indicate whether the statement is true or false.
Directional selection would be expected to occur if
A. a new allele arises by mutation that increases fitness. B. the environment changes. C. the population is large. D. a new allele arises by mutation that increases fitness and the environmental changes increase the allele frequency. E. a new allele arises by mutation that increases fitness, the environment changes and the population is large are correct.
An example of the morphological species concept would be achieved by
a. doing a genetic analysis on the two organisms. b. looking at the appearance of two organisms. c. mating the two organisms to see if viable offspring result. d. observing the mating rituals of the two organisms. e. tracing the common ancestry of the two organisms.
Histones are involved in _______________
(a) regulating the checkpoints of the cell cycle (b) lengthening the ends of the telomeres (c) compacting the DNA molecule (d) cytokinesis