6. Ion channel gates close the pores of some ion channels in response to Select

Question

6.

Ion channel gates close the pores of some ion channels in response to

Select one:
a. stretching of the cell membrane
b. a change in electrical charge
c. the binding of specific molecules to the channel
d. All of the above

7.

An atom that has gained or lost electrons is called a(n)

Select one:
a. molecule
b. nucleon
c. ion
d. element

Which of the following does not require energy?

Select one:
a. diffusion
b. endocytosis
c. active transport
d. sodium-potassium pump

Transport proteins that allow ions to pass through the cell membrane are called

Select one:
a. receptor proteins
b. marker proteins
c. ion channels
d. None of the above

Match the different levels of protein organization with their definition.

Levels of organization:
1. Primary structure
2. Secondary structure
3. Tertiary structure
4. Quaternary structure

Definitions:
A. Linear sequence of amino acids in the polypeptide chain
B. Three-dimensional structure of a polypeptide
C. Highly regular local sub-structures such as ?-helix and ?-pleated sheet structures
D. Three-dimensional structure of a multi-subunit protein

Select one:
a. 1-C, 2-D, 3-B, 4-A
b. 1-A, 2-C, 3-B, 4-D
c. 1-D, 2-A, 3-B, 4-C
d. 1-A, 2-B, 3-D, 4-C
e. 1-C, 2-D, 3-A, 4-B

Explanation / Answer

6.

Ion channel gates close the pores of some ion channels in response to

d. All of the above

The ion channels can be mechanically gated or voltage gated or can open when bound by a specific molecule.

An atom that has gained or lost electrons is called a(n)

c. ion

Transport proteins that allow ions to pass through the cell membrane are called

c. ion channels

Match the different levels of protein organization with their definition.

Levels of organization:

b. 1-A, 2-C, 3-B, 4-D

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