Based on your measurement of the length of an individual phospholipid, approximately how thick do you think a typical cell membrane is?

a. 0.1 nm
b. 1 nm
c. 10 nm
d. 100 nm


c

Biology & Microbiology

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Gametophytes that are completely enclosed within the walls of a spore are known as

A. heterosporic lycophytes. B. endosporic gametophytes. C. micropyles. D. endospermic sporophytes. E. phragmoplasts.

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Seasonal migration is common among marine fisheries. Describe the types and indicate the primary causes of migration

What will be an ideal response?

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As summer comes to the tundra, what will

occur?

a. A long growing season will begin. b. The surface layer will thaw and pools of water will form. c. The permafrost thaws out. d. Birds will begin their southerly migration. e. more than one of these

Biology & Microbiology

The differences in relative concentrations of ions inside and outside the cell act as an electrical force. The specific ion(s) MOST important to establishing the resting potential in neurons would be

A. intracellular anions (e.g., proteins). B. Na+, K+ and intracellular anions are all important. C.  H+.           D. Na+. E. K+.

Biology & Microbiology