Which anterior pituitary hormone triggers ovulation?
a. GnRH
b. estrogen
c. progesterone
d. FSH
e. LH
ANSWER: e
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Codons that serve as "stop" signals for translation are recognized by
A. anticodons. B. aminoacyl-tRNA synthetases C. translation terminators. D. tRNA. E. release factors.
During the stage called neurulation, a flexible rod called a ________ forms along the midline of the dorsal surface of the embryo.
A. neural groove B. notochord C. somite D. dorsal nerve cord
Which number are the Transitional vesicles?
What will be an ideal response?
Keystone species are those that ________
a. modify the pioneer environment, allowing subsequent stages in succession to occur b. after introduction, become established and disruptive to the native structure of a community c. have a disproportionate effect on a community relative to their abundance d. provide the photosynthetic plant base necessary to all communities