The human immunodeficiency virus first attacks
a. helper T cells.
b. B cells.
c. dendritic cells.
d. cytotoxic T cells.
e. macrophages.
Answer: a
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A. two diploid, two haploid B. two diploid, 4 haploid C. two haploid, 4 haploid D. two haploid, two haploid E. two somatic, two gametic
Taxonomists tend to use the __________ to characterize species for classification
a. morphological species concept b. biological species concept c. evolutionary species concept d. ecological species principle e. genetic species principle
As cells grow, the amount of surface area increases by the ____ but volume increases by the ____.
A. square (X2), cube (X3) B. cube (X3), square (X2) C. minute, hour D. minute, day
Microscopic examination of a patient's fecal culture shows spiral bacteria. The bacteria probably belong to the genus
A) Campylobacter jejuni. B) Escherichia coli. C) Salmonella typhi. D) Shigella spp. E) Vibrio cholerae.