What process occurs when potassium ions diffuse out of a nerve cell and the inside of the cell again becomes more negative than the outside?

A) depolarization
B) polarization
C) repolarization
D) threshold


C

Biology & Microbiology

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A fruit that develops from several ovaries in a single flower, such as a raspberry, is called a(n) ____

a. aggregate fruit b. accessory fruit c. multiple fruit d. simple fruit e. compound fruit

Biology & Microbiology

The selective permeability of a cell membrane is due to ____

a. the hydrophobic core formed by the phospholipid tails b. the hydrophilic end facing the cell 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

Biology & Microbiology

The methanogenic archaeans are __________ that

pull electrons from __________. a. chemoautotrophs; oxygen b. chemoheterotrophs; carbon dioxide c. chemoautotrophs; water d. chemoheterotrophs; methane e. chemoautotrophs; hydrogen gas

Biology & Microbiology

In the biosynthetic pathway for conversion from homoserine to methionine, you identify a Neurospora crassa double mutant Met1/Met2. This mutant will grow only if which supplement(s) are added to the minimal media?

A) homoserine only B) cysteine only C) homocysteine only D) cystathionine and homocysteine E) methionine only

Biology & Microbiology