Studies of a soybean plant (Glycine max) and the bacterium Bradyrhizobium japonicum have shown that after the
bacterium enters the root, cells of the root cortex begin to divide in response to ____.
a. a flavonoid released by soybean roots
b. nod gene products produced by soybean roots
c. nod gene products produced by the bacterium
d. nitrogen fixation by the bacterium
e. a flavonoid produced by the bacterium
ANSWER: c
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How did researchers test if flatworms could moderate the immune system?
A. exposing white blood cells to flatworm antigens and measuring interleukin-10 concentrations B. exposing white blood cells to dust mite antigens and measuring interleukin-10 concentrations C. exposing white blood cells to flatworm antigens and measuring histamine concentrations D. exposing white blood cells to dust mite antigens and measuring histamine concentrations E. infecting children with flatworms and looking at their number of white blood cells
Which of the following yields carbon dioxide
during the breakdown of glucose in aerobic respiration? a. phosphoglycerate b. pyruvate c. oxaloacetate d. PGAL e. fructose bisphosphate
If species C lives in contaminated water and acquires a low concentration mercury in its tissues, which species will be most affected by the mercury?
A) All species will be impacted equally. B) species B C) species C D) species D E) species E
Graft-versus-host disease results under which conditions?
A) when immunocompetent cells are placed in an immunocompromised host B) when immunodeficient cells are placed in an immunocompetent host C) any time tissue is not exactly matched in a transplant D) only when adult cells are transplanted into a baby