Plants exude ____ from roots to stimulate the growth of soil fungi
a. strigolactones
b. cytokinins
c. ethylene
d. auxins
e. jasmonates
ANSWER: a
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The mechanism by which antigen-reactive cells respond to foreign antigens while ignoring self-antigens is called clonal
A) selection. B) deletion. C) anergy. D) expansion.
Which of the following statements about the loop of Henle is correct?
A. The thick segment of the ascending limb is impermeable to water. B. The descending limb actively transports electrolytes into the interstitial fluid. C. Water moves from the interstitial fluid into the descending limb of the loop of Henle. D. The filtrate is more concentrated when it leaves the loop of Henle than when it enters the loop. E. All of these answer options are correct.
Megaspores produce
a. female gametophytes. b. microspores. c. sporophytes. d. embryos. e. diploid tissue.
In the general population, 1 in 300 individuals is a carrier for Tay-Sachs disease, while 1 in 30 individuals of Ashkenazi Jew descent are carriers
Tay-Sachs also affects 1 in 30 individuals with French-Canadian ancestry, although two completely unique mutations are responsible for the Ashkenazi and French-Canadian mutations. What are the chances of two individuals who are carriers having a child with Tay-Sachs if a. both individuals are not of Ashkenazi or French-Canadian descent? b. one individual is of Ashkenazi descent and one is not? c. both individuals are of Ashkenazi descent?