All of the following allow for fast gas exchange EXCEPT
a. more dense medium.
b. colder temperatures.
c. a steep gradient.
d. a large surface area.
A
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When a membrane is freeze-fractured, the bilayer splits down the middle between the two layers of phospholipids. In an electron micrograph of a freeze-fractured membrane, the bumps seen on the fractured surface of the membrane are _____
A) peripheral proteins B) phospholipids C) carbohydrates D) integral proteins E) cholesterol molecules
Which of the organisms below give support for
the colonial theory of animal origins?
a. Charophytes b. Choanoflagellates c. Chytrids d. Confuciusornis e. Club fungi
Geographic isolation prevents
A. continental drift. B. mating. C. mutations. D. polygenic inheritance.
Lysosomal proteins are initially incorporated into _______ vesicles.
a. uncoated b. clathrin-coated c. COPI-coated d. COPII-coated