For a parasite living in human skin, the person is the:
A) mimic. B) prey. C) victim. D) host.
Answer: D
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A population of mountain goats are split because of the formation of a glacier. After 500 years the glacier melts and the two goat populations are free to move between the two areas. Under what conditions might a hybrid zone occur?
A. Both pre-¬ and post-¬zygotic isolating mechanisms have arisen. B. Reproductive isolation is incomplete. C. Pre-¬zygotic isolating mechanisms have arisen. D. Post-¬zygotic isolating mechanisms have arisen. E. Gene flow between the two populations does not occur.
The number of parasites per individual is relatively high in most individuals and low in a few individuals
Indicate whether the statement is true or false
A major function of the Casparian strip of the endodermal cells of a root is to
(A) protect the meristem as the root tip grows through the abrasive soil particles (B) allow for expansion of the vascular cambium as the root grows laterally (C) control the movement of materials into the vascular cylinder of the root (D) initiate lateral root growth (E) serve as a site for the storage of excess sugars in the form of starch
Which of the following statements about retroviruses is correct?
A) Retroviruses produce mRNA from the integrated viral DNA but produce progeny RNA genome from the genomic RNA template. B) Retroviruses produce both progeny RNA genome and mRNA from the genomic RNA template. C) Retroviruses produce progeny RNA genome from the integrated viral DNA but produce mRNA from the genomic RNA template. D) Retroviruses directly use the genomic RNA for viral protein translation. E) Retroviruses produce both progeny RNA genome and mRNA from the integrated viral DNA.