If a person was not able to produce pancreatic
secretions, which macromolecule(s) would
they have difficulty digesting?
a. carbohydrates
b. proteins
c. fats
d. nucleic acids
e. all of these
E
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HIV once only infected nonhuman primates and now infects humans as well. Likewise, the avian flu only infected birds but now infects humans. What causes the host range of a virus to increase?
A. The size of the virus changes over time and allows the virus to infect a different host cell. B. The virus integrates with another virus to gain the DNA sequences that allow infection of a new host cell. C. The virus gains entry into a new host cell through random mutation of the virus's genetic material. D. Changes in the human genome over time make humans more susceptible to infection by different kinds of viruses. E. None of the answer options is correct.
All of the following are goals of conservation
biology EXCEPT a. to investigate the decline in genetic diversity. b. to survey the range of biodiversity. c. to determine if loss of any specific species would be detrimental to mankind. d. to identify ways to maintain and use biodiversity to help man. e. all of these are goals of conservation biology.
_________ is the mitotic phase during which sister chromatids move toward the poles of the spindle
A) telophase B) prophase C) metaphase D) anaphase
As the levels of organization in a body goes from cell to organ system, it
a) decreases in complexity b) becomes more separated c) becomes more random d) increases in complexity