The selective permeability of a cell membrane is due to ____

a. the hydrophobic core formed by the phospholipid tails
b. the hydrophilic surface facing the cell's exterior
c. glycolipids on the surface of the membrane


d. the position of cholesterol in the membrane bilayer
e. the hydrophilic core formed by the phospholipid tails


ANSWER: a

Biology & Microbiology

You might also like to view...

The conversion of gaseous nitrogen (N2) to ammonia (NH4+) occurs during ________.

A. ammonification B. nitrogen fixation C. photosynthesis D. nitrification E. denitrification

Biology & Microbiology

The first community to occupy a recently denuded region is referred to as

a. climax. b. diversity. c. pioneer. d. mosaic climax. e. transition.

Biology & Microbiology

The ultimate source of all energy in a terrestrial ecosystem is

a. the organic matter in all the organisms of the ecosystem. b. water. c. sunlight. d. carbon dioxide. e. ATP.

Biology & Microbiology

A cuboidal shaped cell with six sides is 1 mm × 1 mm × 1 mm. What is the volume and the surface area of the cell?

A. 3 mm3 : 3 mm2 B. 1 mm3 : 3 mm2 C. 3 mm3 : 1 mm2 D. 1 mm3 : 6 mm2

Biology & Microbiology