When a virus enters a host cell in which it can replicate, the process is called a(n)
A) insertion.
B) infection.
C) prophage.
D) excision.
Answer: B
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Which of the following is the portion of the vertebrate skeleton that includes the skull, vertebrae, and ribs?
A. the axial skeleton B. the central skeleton C. the appendicular skeleton D. the trunk
Which of the following adaptations was a key to allowing conifers to be successful in diverse terrestrial habitats
The major advantage provided to plants by root hairs is:
A) underground asexual reproduction. B) needle-like points for drilling through hard or rocky soil. C) ability to produce new taproots. D) greatly increasing absorptive surface area.
A community ecologist might study:
A) all the members of a single species that live together in a single geographic area. B) the behavior of a species in its natural environment. C) the rates of increase or decrease in the population size of individual species in different environments. D) the interactions among species living in a single area.