The type of viral infection in which a virus enters a host cell and remains dormant in the host cell's chromosome is
A. a rare form of viral infection.
B. a transgenic infection.
C. a lytic infection.
D. a systematic infection.
E. a lysogenic infection.
E. a lysogenic infection.
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The movement of organisms away from their place of origin, called ____, can produce a ____ distribution, in which
closely related species live in widely separated locations.
a. fragmentation; continuous b. vicariance; disjunct c. vicariance; continuous d. dispersal; disjunct e. dispersal; continuous
The depolarization of the heart is initiated by the
A. left and right bundle branches. B. bundle of HIS. C. atrioventricular node. D. Purkinje fibers. E. sinoatrial node.
A zygote is a(n) ____
a. diploid cell b. haploid cell c. gamete d. female gonad e. male gonad
Which cells are likely to have a higher cellular water potential?
A. sieve-tube elements near source tissues B. sieve-tube elements near sink tissues