What Are the Characteristics of Proteins in Plasma Membranes?

In summary, an analysis of proteins in plasma membranes reveals that they are formed from nitrogenous bases linked together by peptide bonds and are built by the same cells in whose membranes they are located. They are not all enzymes and are not immobile or entirely non-polar molecules.
  • #1
gabby21090
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Homework Statement



An analysis of proteins in plasma membranes would reveal that:

they are all enzymes.
they are immobile in the bilayer.
they are entirely non-polar molecules.
they are formed from nitrogenous bases linked together by peptide bonds.
they are built by the same cells in whose membranes they are located.

Homework Equations





The Attempt at a Solution



i know they are not all immobile or entirely nonpolar molecules. But I don't know what the write answer is
 
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  • #2
. The correct answer is: They are formed from nitrogenous bases linked together by peptide bonds and they are built by the same cells in whose membranes they are located.
 

1. What is the function of protein in the plasma membrane?

The main function of protein in the plasma membrane is to act as gatekeepers, controlling the movement of substances in and out of the cell. They also play a role in cell signaling and communication, as well as structural support.

2. How does protein contribute to the fluidity of the plasma membrane?

Protein molecules are embedded within the phospholipid bilayer of the plasma membrane, and their shape and structure help to maintain the fluidity and flexibility of the membrane. Some proteins also act as channels or pumps to facilitate the movement of substances across the membrane.

3. What types of proteins are found in the plasma membrane?

There are two main types of proteins in the plasma membrane: integral proteins and peripheral proteins. Integral proteins span the entire membrane and are embedded within it, while peripheral proteins are attached to the surface of the membrane. Both types of proteins have specific functions and play important roles in maintaining the integrity of the membrane.

4. Can the amount of protein in the plasma membrane vary between different cell types?

Yes, the amount and types of protein in the plasma membrane can vary between different cell types. This is because different cells have different functions and therefore require different types and amounts of proteins in their membranes. For example, muscle cells may have a higher concentration of proteins involved in muscle contraction, while nerve cells may have more proteins involved in cell signaling.

5. What happens to protein levels in the plasma membrane during cell division?

During cell division, the plasma membrane needs to expand to accommodate the two daughter cells. As a result, the amount of protein in the membrane may decrease temporarily. However, after cell division is complete, the cells will begin to produce more proteins to restore the balance and maintain proper membrane function.

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