Biology 9700 · AS & A Level · Protein synthesis

Protein synthesis — practice question

Collagen is a fibrous protein present in many animal tissues.
(a)[5]

Describe the structure of a collagen molecule and of a collagen fibre.

(b(i))[1]

State the precise name of the monosaccharide labelled D in Fig. 2.1.

(b(ii))[1]

On Fig. 2.1, mark the glycosidic bond with the letter G. Record your answer on Fig. 2.1.

(b(iii))[1]

On Fig. 2.1, encircle the R group of hydroxylysine and label that circle with the letter $R$. Write your answer on Fig. 2.1.

(c)[2]

Osteogenesis imperfecta is a disease caused by a shortage of collagen. Suggest how a named tissue or structure is affected in a person with this disease.

(i)[1]

State the precise name of the monosaccharide marked D in Fig. 2.1.

(ii)[1]

On Fig. 2.1, show the glycosidic bond by writing the letter G. Record your answer on Fig. 2.1.

(iii)[1]

On Fig. 2.1, draw a circle around the R group of hydroxylysine and label the circle with the letter R. Record your answer on Fig. 2.1.

Worked solution & mark scheme

This 13-mark question has a full step-by-step worked solution and mark scheme. One marking point: A collagen molecule consists of a triple helix made from three polypeptide chains.

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