Question

11-35 Both glycoproteins and proteoglycans contribute to the carbohydrate layer on the surface

of the cell. Which of the following is not true of glycoproteins?
(a) They can be secreted into the extracellular environment.
(b) They have only one transmembrane domain.
(c) They have long carbohydrate chains.
(d) They are recognized by lectins

Answer 1

Glycoproteins are recognized by lectins and can be secreted into the extracellular environment. They have long carbohydrate chains and are recognized by lectins. The incorrect statement is that glycoproteins have only one transmembrane domain.

Step-by-step explanation:

Both glycoproteins and proteoglycans contribute to the carbohydrate layer on the cell surface. Glycoproteins are proteins with carbohydrate molecules attached that extend into the extracellular matrix. They can be secreted into the extracellular environment. Glycoproteins can have multiple transmembrane domains, not just one. They have long carbohydrate chains, which aid in cell recognition. Additionally, glycoproteins are recognized by lectins. Therefore, the correct answer is (b) They have only one transmembrane domain.