"Mutationism" suggested that evolution occurred gradually through time
Indicate whether the statement is true or false.
ANS: F, in spurts
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In biological nitrogen-fixation, ____
a. ammonia is converted to nitrogen gas b. nitrogen gas is converted to ammonia c. ammonia is converted to nitrate d. amino acids are linked into proteins in ribosomes e. nitrate is converted to ammonia
By the end of spermatogenesis, how many mature sperm have been formed?
a. 1 b. 2 c. 4 d. 3
The placenta
a. forms from endometrial and extraembryonic tissues. b. will cover about one-fourth of the inner uterine surface at full term. c. does not normally intermingle fetal blood with maternal blood. d. secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters. e. does all of these.
All of the following cause developmental enamel defects, EXCEPT
A. Febrile Diseases B. Fluorosis C. Natal Teeth D. Tetracycline E. Treacher-Collins Syndrome