Question

Which statements about the proteins and glycoproteins in cell surface membranes are correct?

1 . They can allow cells to bond together to form tissues.
2. They can recognise messenger molecules like hormones.
3.They can be antigens and allow cell to cell recognition.
A 1, 2 and 3
B 1 and 2 only
С 1 and 3 only
D 2 and 3 only

Answer 1

All three statements about proteins and glycoproteins in cell surface membranes are correct. They are involved in cell adhesion, hormone recognition, and cell-to-cell identification through the glycocalyx.

Step-by-step explanation:

Among the statements about the proteins and glycoproteins in cell surface membranes, all three are correct:

1. 
   
3. 
   
5. 
   

This is because membrane proteins and glycoproteins serve as critical components for cell-to-cell communication, recognizing environmental signals, and providing structural support for the formation of tissues. The glycocalyx, which is a fuzzy-appearing coating around the cell, plays a key role in these functions. It is composed of carbohydrate chains attached to protein or lipid molecules on the cell's surface and is responsible for cell recognition and antigenicity, thereby allowing the immune system to differentiate between body cells ("self") and foreign cells or tissues ("non-self"). Moreover, membrane proteins can act as receptors for hormones and other signalling molecules, conveying messages into the cell through signal transduction.