The "pill" works primarily by ____
a. blocking sperm from entering the uterus
b. causing spontaneous abortions
c. inhibiting the release of FSH and LH
d. preventing implantation of the embryo
e. stimulating the release of GnRH
ANSWER: c
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Which type of plant hormone retards leaf aging?
a. salicylic acid b. abscisic acid c. cytokinins d. ethylene e. gibberellins
The best method for culturing Chlamydia is
A. a minimal, defined selective medium. B. to incubate the medium at slighty lower than body temperature. C. enrichment through several rounds of blood culture. D. eukaryotic cell culture.
What is the ultimate source of genetic variation in populations?
What will be an ideal response?
Consider the life cycle shown in Figure 27-2. If the boxes labeled “n” and “2n” represent multicellular structures, this life cycle could be representative of all of the following except:
a. ferns
b. club mosses.
c. horsetails.
d. hornworts.
e. algae