How do barrier methods of birth control prevent conception?

What will be an ideal response?


Barriers prevent the egg and sperm from meeting, so fertilization cannot occur.

Biology & Microbiology

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During the citric acid cycle, the production of CO2 is a(n) _____ reaction coupled to the production of ____________

A. oxidation; NADH B. oxidation; ATP C. reduction;, NADH D. reduction; ATP E. oxidation; GTP

Biology & Microbiology

The excretory structures of terrestrial arthropods are slender projections from the digestive tract that are attached at the junction of the midgut and hindgut. These are called  

A.  flame cells. B.  kidneys and bladders. C.  Malpighian tubules. D.  nephridia. E.  ocelli.

Biology & Microbiology

For an enzyme to function it requires

a. oxygen. b. a suitable substrate. c. a considerable amount of activation energy. d. ATP. e. all of these.

Biology & Microbiology

Splicing of eukaryotic heteronuclear RNA is catalyzed by ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology