A confused frog deposits its sperm onto a toad's eggs as they are being laid. No offspring develop because the frog's sperm are unable to penetrate the toad's egg. This is an example of

A. mechanical isolation.
B. temporal isolation.
C. habitat isolation.
D. behavioral isolation.
E. gametic isolation.


E. gametic isolation.

Biology & Microbiology

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True or False: K-strategists tend to inhabit "unpredictable" environments and also have population densities near the carrying capacity of an environment

A. true B. false

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Glycerol forms the backbone of ____

a. triglycerides only b. polysaccharides and nucleic acids c. nucleic acids only d. polypeptides only e. triglycerides and phospholipids

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Sperm-producing cells are referred to as

a. spermatocytes. b. Sertoli cells. c. interstitial cells. d. seminiferous cells. e. spermatogenic cells.

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In the chemical shorthand 14C, the 14 represents the

number of a. excess neutrons. b. protons plus neutrons. c. electrons. d. protons plus electrons. e. radioactive particles.

Biology & Microbiology