All of the following can contribute to desertification
EXCEPT
a. drought.
b. overplowing.
c. overgrazing.
d. natural fertilizer.
e. all of these.
Answer: d
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What type of test affixes an antigen to an inert particle such as a latex bead?
A. Cross-reactions B. Agglutination C. Precipitation D. Specificity E. Sensitivity
Four of the following statements are true of predator-prey coevolution. Which one is FALSE?
a. Each species exerts selection pressure on the other. b. Predators are selective agents that favor improved prey defenses. c. Prey with better defenses are selective agents that favor better predator hunting skills. d. Coevolution only occurs in animals and is usually seen after one reproductive generation. e. Camouflage, warning coloration, and mimicry are all examples of coevolution tactics.
How many copies of a particular gene of interest are produced from a single template DNA strand after three cycles of PCR?
A) Five B) Three C) Four D) Eight E) Two
A covalent bond occurs when ________.
a. protons are transferred from one atom to another b. neutrons are shared between two atoms to form an isotope c. electrons are shared between two atoms to complete their octets d. electrons are transferred from one atom to another