Question

The cell membrane is made up of many different kinds of proteins. These proteins can be classified as either peripheral, transmembrane, or lipid-anchored proteins. Regardless of their classification, these proteins all play an important role in the function and integrity of a cell. Which of the following properly describes the function of membrane proteins?
- to combine with a carbohydrate, providing an immune response and/or cell recognition
- to provide structural stability for the cell
- to serve as a channel for the transport of molecules between extracellular and intracellular fluid
- to allow for cell-cell communication

Answer 1

Answer:

Membrane proteins contains a broad range of proteins that are present within or along the cell membrane. They have various functions, but according to the statement the most precise function of cell membrane proteins is to serve as a transport channel.

Explanation:

Proteins are an integral part of cell memebrane. They are transmembrane proteins, integral proteins and peripheral proteins.

All these proteins serve different essential functions for the maintainence of cell and survival of organism.

They act as

1) Membrane receptors

2) Transport proteins

3) Membrane enzymes

Integral membrane proteins are attached within the cell membrane permanently.

Peripheral proteins are attches to the lipid bilayer thorugh integral proteins by covalent hydrostatic and electrostatic forces.

These proteins may be modified by added fatty acids and carbohydrate chains.

Answer 2

Answer: ALL OF THE ABOVE ARE CORRECT

Explanation:

A cell membrane is a collage of different proteins embedded in the fluid matrix of the lipid bilayer.

Major functions of membrane proteins include:

1. INTERCELLULAR JOINING

Proteins on adjacent cells hook together, briefly, for cell interaction/sharing.

2. TRANSPORT

Transport proteins are used in various ways to move substances back and forth across the cell membrane.

3. SIGNAL TRANSDUCTION

Transmission of molecular signals from a cell's exterior to its interior.

4. ENZYMATIC ACTIVITY

When a protein built into the membrane may be an enzyme with its active site exposed to substances in the adjacent solution

5. CELL-CELL RECOGNITION

Cell's ability to distinguish one type of cell from another

When some glycoproteins (proteins bonded to short chains of sugars) serve as identification tags that are specifically recognized by other cells

6. ATTACHMENT TO CYTOSKELETON AND EXTRACELLULAR MATRIX

Maintains cell shape and stabilizes cytoskeleton