Question

Choose the correct answer from the alternatives given.
Which of the following is not true concerning the plasma membrane?

• A. It is responsible for maintaining an electrochemical gradient between the inside and outside of the cell.
• B. It is composed of folds known as cristae.
• C. It is composed of phospholipids and proteins.
• D. It helps protect the internal contents of the cell.

Answer 1

Answer: (B)

It is composed of folds known as cristae.

• The plasma membrane of a cell is a semipermeable membrane that protects the inner contents of the cell by separating the inner environment of the cell from the outer environment. It also maintains an electrochemical gradient between the inside and outside of the cell. It is composed of phospholipid bilayer which has integral and peripheral proteins embedded in it.
• Cristae are the folds of the inner membrane of the mitochondria.

So, the correct answer is 'It is composed of folds known as cristae.'