Which term refers to the tough, pliable body of a lichen?
a. thallus
b. arbuscule
c. haustorium
d. soredium
Ans: a. thallus
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Many lakes in the United States are suffering from periodic algae blooms, which can be thought of as an infection of the lake. Although the algae are naturally-occurring in the lake, when adjacent farm fields are over-fertilized with diammonium phosphate, the run-off deposits these nutrients in the lake, allowing the algae to grow without limit. Which of the following statements is incorrect regarding the overgrowth of algae?
A. Lakes have sufficient micronutrients for algae to grow. B. The nitrogen in the fertilizer is in the ammonium form, the preferred nitrogen source of most microbes. C. The phosphorus in the fertilizer is in the phosphate form, the preferred phosphorus source of most microbes. D. The algae are heterotrophs. E. The carbon source for these algae is not limiting in lakes.
High altitude acclimatization results in all of the
following EXCEPT a. increased production of erythropoietin. b. increased blood-cell production. c. decreased workload for the heart. d. an increase in blood viscosity. e. increased O2 concentration in the blood.
Which of the following is NOT true after a man has had a vasectomy?
A. The vas deferens still transports sperm to the urethra. B. The interstitial cells can still release hormones. C. The uterine tube will not be affected. D. The semen will not contain sperm. E. Bulbourethral glands are not affected by the operation.
Genomic libraries are constructed from the fragments generated from a ________ digest
A) random B) complete C) incomplete D) gene specific