Glycoproteins are involved in nearly every biological process studied to date. T

Question

Glycoproteins are involved in nearly every biological process studied to date. The following statements are true about glycoproteins: D. Glycoproteins are involved in functions as diverse as fertilization, platelet aggregation, intracellular targeting, and virus-host interactions. C. Glycosylation sites on proteins always occur at Gin for N-linked glycosylation, and at Ser or Thr for O-linked glycosylation. A. Glycoproteins differ from proteoglycans in the proportion of carbohydrate and protein components. B. When glycoproteins are found as membrane proteins, the carbohydrate portions extend to the outside of the cell. E. Less than 10% of eukaryotic proteins are glycosylated

Explanation / Answer

ANSWER:

EXPLAINATION FOR EACH POINT

A. Glycoprotein compounds contain carbohydrates that are covalently linked to protein. The carbohydrates may be in the form of a monosaccharide, disaccharide, oligosaccharide, polysaccharide, or their derivatives. One or multiple carbohydrate units may be present. Proteoglycans are a subclass of glycoproteins in which the carbohydrate units are polysaccharides that contain amino sugars but they differ in the composition. The carbohydrate content of proteoglycans and glycoproteins is about 10 – 15% & 50 – 60% respectively. " TRUE"

B.  Glycoproteins found as membrane proteins plays role in cell–cell interactions and have small carbohydrate chain exyending out of the cell surface, this helps in stabalizing the cell. " TRUE"

C. N-linked occurs at ER sites also. " FALSE"

D. Glycoprotien have been diversely applicable in all the mentioned fiels. " TRUE"

E. Eukaryotic protein has the greatest range of organisms that can be grouped as glycoprotein and can be glycosylated. " FALSE"

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