HIV causes acquired immunodeficiency by infecting
A. B cells.
B. helper T cells.
C. cytotoxic T cells.
D. thymus cells.
E. both B and cytotoxic T cells.
Answer: B
You might also like to view...
The lock-and-key fit of the genitalia of many male and female insects of the same species is an important part of ensuring reproductive success. Which of the following statements provides an explanation for the fit and shape of insect genitalia?
A. In order to achieve high reproductive success males choose to have genitalia that fit only into the reproductive tracts of females from different species so that they can start new species. B. In order to be successful on land and ensure fertilization, males choose genitalia that only fit into female genitalia of the same species. C. Success in terrestrial environments was increased because sperm were deposited within a female of the same species and increased the probability of fertilization. D. Success in terrestrial environments was increased because males who deposited sperm within females helped to ensure survival of the species once they had colonized land.
Each of the following are features of a cloning host except
A. mapped genome. B. transformable. C. minimal growth requirements. D. pathogenicity. E. quick generation time.
Which of the boxed subsets of the DNA molecule pictured below consists of a nucleotide?
1.1
2.2
3.3
4.4
5.5
The normal pH of body fluids is ____
a. acidic b. always 7.0 c. slightly basic d. in the 6.0-8.0 range e. controlled primarily by water balance