The human immunodeficiency virus (HIV) cripples the functioning of the adaptive immune system because it selectively infects and destroys one particular class of cells, which are required for mounting a vigorous immune response to a variety of foreign pathogens or cancer cells. What cell is the most likely target of the HIV virus?
A. Helper T cells
B. Cytotoxic T cells
C. Neutrophils
D. Suppressor T cells
E. Natural killer cells
Answer: A
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Imagine a planet that has a similar atmospheric pressure to Earth (760 mmHg), but different concentrations of gases in its atmosphere
On this hypothetical planet, oxygen makes up 10% of the atmosphere, nitrogen makes up 15%, and carbon dioxide makes up the remaining 75%. Based on this information, what is the partial pressure of oxygen on this new planet? A. 76 mmHg B. 114 mmHg C. 160 mmHg D. 571 mmHg E. 646 mmHg
Plant embryos grow into seedlings by adding new cells at only two growth points which are called:
A. parenchyma cell points B. collenchyma cell points C. sclerenchyma cell points D. vascular cell points E. shoot and root apical meristems
The first federally approved gene therapy test on humans was designed to treat
a. severe combined immune deficiency. b. diabetes. c. cystic fibrosis. d. hemophilia. e. leukemia.
In eukaryotic cells, ribosomes have two locations: scattered free in the ________, and bound on the surface of the ________.
What will be an ideal response?