Question1 - The starches--amylose, amylopectin, and glycogen--are all homopolysa

Question

Question1 - The starches--amylose, amylopectin, and glycogen--are all homopolysaccharides of -D-glucose. Which of the following statements are true about the structure and function of the starches? (Choose all that apply)

B. Amylose is unbranched and can adopt a helical structure

C. Their function is primarily as structural components of cell walls

D. They are stored intracellularly as insoluble granules

E. Each molecule of starch has only one reducing end

F. Glycogen contains both (16) and (14) glycosidic bonds

A. Amylopectin is the most highly branched of the structures

Question2 - Glycoproteins are involved in nearly every biological process studied to date. The following statements are true about glycoproteins: (Choose all that apply)

B. When glycoproteins are found as membrane proteins, the carbohydrate portions extend to the outside of the cell.

C. Glycosylation sites on proteins always occur at Gln for N-linked glycosylation, and at Ser or Thr for O-linked glycosylation.

D. Glycoproteins are involved in functions as diverse as fertilization, platelet aggregation, intracellular targeting, and virus-host interactions.

E. Less than 10% of eukaryotic proteins are glycosylated

A. Glycoproteins differ from proteoglycans in the proportion of carbohydrate and protein components.

Explanation / Answer

Answer 1-

B. Amylose is unbranched and can adopt a helical structure
TRUE, there is no branches, it is a linear chain polymer of glucose. It attains helix structure.

C. Their function is primarily as structural components of cell walls
FALSE; their main function is storing the energy of the plant in form of long chains of glucose.

D. They are stored intracellularly as insoluble granules
TRUE; this is the main function of amylose as it occupies lesser space and not digested easily. That's why it is the storage form.

E. Each molecule of starch has only one reducing end
FALSE; this is visible in amylopectin, where there is one reducing and multiple non reducing ends. But in Amylose, there is no reducing end as it is a linear form of starch.

F. Glycogen contains both (16) and (14) glycosidic bonds
TRUE, because linear chain contains (14) bond and branch contains (16) bonds.

A. Amylopectin is the most highly branched of the structures
TRUE; it is highly branched, that's why it is different from amylose.

Answer 2-

Option A, B and D are true statements.

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