Retinoic acid ____
a. causes germ cells in male embryos to enter meiosis
b. causes germ cells in female embryos to enter meiosis
c. prevents germ cells in male embryos from entering meiosis
d. prevents germ cells in female embryos from entering meiosis
e. affects entry into mitosis but not meiosis
ANSWER: b
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Carrier-mediated transport is necessary when
A) diffusion will not allow adequate amounts of a substance to enter the cell. B) movement into the cell is against a concentration gradient. C) the level of nutrients in nature is very low. D) nutrient concentration is very low in the environment, is higher inside of the cell, or diffusion is not possible.
Adding phosphorus to an aquatic ecosystem can result in a(n) __________ that clouds water and threatens other
aquatic species. Fill in the blank(s) with the appropriate word(s).
From what feature are jaws through to have
evolved? a. pharynx b. vertebrae c. legs d. arms e. gill arches
Which anterior pituitary hormone stimulates and maintains milk production?
a. FSH b. LH c. prolactin d. ACTH e. TSH