LIFE SCIENCE

OBJECTIVE LIFE SCIENCE

CELL BIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What are peripheral proteins, and where are they located?
A
Some proteins which are attached to the surface of the cell membrane are called peripheral proteins. These are located on the external surface.
B
Some proteins which are attached to the surface of the cell membrane are called peripheral proteins. These are located on both the external and internal surface.
C
Some proteins which are attached to the surface of the cell membrane are called peripheral proteins. These are located on the internal or external surface.
D
Some proteins which are attached to the surface of the cell wall are called peripheral proteins. These are located on both the internal and external surface.
E
Some proteins which are attached to the surface of the cell wall are called peripheral proteins. These are located on the external or internal surface.
Explanation: 

Detailed explanation-1: -Peripheral membrane proteins, or extrinsic membrane proteins, are membrane proteins that adhere only temporarily to the biological membrane with which they are associated. These proteins attach to integral membrane proteins, or penetrate the peripheral regions of the lipid bilayer.

Detailed explanation-2: -These enzymes have been described as peripheral membrane proteins, located in the inner mitochondrial membrane facing the cytosol, or in the cellular membranes of bacteria. Their mode of interaction with the membrane remains a point of discussion.

Detailed explanation-3: -Transmembrane proteins, many proteins held in the bilayer by lipid groups, and some proteins held on the membrane by unusually tight binding to other proteins cannot be released in these ways. These proteins are called integral membrane proteins.

Detailed explanation-4: -Peripheral membrane proteins are found on the outside and inside surfaces of membranes, attached either to integral proteins or to phospholipids. Unlike integral membrane proteins, peripheral membrane proteins do not stick into the hydrophobic core of the membrane, and they tend to be more loosely attached.

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