Which statement about the plasma membrane is INCORRECT?

Here are the answers to the questions from the image:

1. The correct answer is D. Ribosomes are responsible for protein synthesis and are found in the cytoplasm or attached to the endoplasmic reticulum, but they are not a structural component of the cell plasma membrane. The plasma membrane is primarily composed of phospholipids, proteins, and cholesterol.

2. The correct answer is B. Many membrane proteins function as receptors that bind to specific signaling molecules, such as hormones, to transmit information into the cell.

3. The correct answer is A. Lysosomes contain powerful digestive enzymes that break down waste materials, cellular debris, and foreign invaders like bacteria and viruses, playing a key role in the cell's defense against disease.

4. The correct answer is B. The statement "It is composed of two layers of glycoproteins molecules" is INCORRECT. The plasma membrane is primarily composed of a phospholipid bilayer, with proteins (including glycoproteins) embedded within or associated with it.