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

Biology & Microbiology

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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

Biology & Microbiology

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.  

Biology & Microbiology

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

Biology & Microbiology

Because they are Gram negative, E. coli, Salmonella, and Shigella all produce

a. exotoxins. b. cytolytic toxins. c. endotoxins. d. enterotoxins.

Biology & Microbiology