How does "the pill" work to prevent pregnancy?
A) It is a barrier between the vagina and the cervix.
B) It delivers progesterone leading the ovary to discontinue ovulating a new oocyte.
C) It produces an acidic environment for sperm.
D) It blocks the oviduct, preventing passage of eggs or sperm.
Answer: B
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Movement of individuals into or out of population that results in a redistribution of alleles is called ________
Fill in the blank(s) with correct word
If 10% of the human population exhibited an undesirable recessive human trait, sterilizing all those showing the trait would completely eliminate this gene in humans in about ____ generation(s).
A. one B. ten C. ninety D. It would never eliminate it.
All ________ have two very different types of nuclei within their cells, small micronuclei and larger macronuclei.
A. dinoflagellates B. sporozoans C. ciliates D. oomycetes E. protists
Because they are Gram negative, E. coli, Salmonella, and Shigella all produce
a. exotoxins. b. cytolytic toxins. c. endotoxins. d. enterotoxins.