Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of ________________.
a. a multifactorial trait
b. polygenic inheritance
c. pleiotropy
d. codominance
Ans: b. polygenic inheritance
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An organ that is hygroscopic
(a) is sensitive to changes in moisture. (b) is exemplified by the peristomal teeth in the sporophyte of mosses. (c) may aid in spore dispersal in mosses. (d) is all of the above.
The amniotic egg of reptiles, birds, and mammals is an adaptation to
(a) thwart carnivorous predators. (b) allow life on land. (c) compensate for the short period of development of the young. (d) protect the young from the nitrogenous wastes of the mother during embryonic development.
When does the human body produce the most lactic acid?
a. after falling into a deep sleep b. during prolonged exercise c. after eating a large meal d. while drinking a glass of milk
Which type of microscopy has the greatest resolving power?
A) electron microscopy B) phase-contrast microscopy C) fluorescence microscopy D) digital video microscopy E) confocal scanning microscopy