Biology 9700/23 — October/November 2015

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

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Topics Biological Molecules · Nucleic Acids and Protein Synthesis · Immunity · Transport in Plants · Enzymes · Cell Membranes and Transport · +2 more

Q1Nucleic Acids and Protein SynthesisBiological MoleculesImmunityFree sample

Antibodies are secreted by activated B-lymphocytes known as plasma cells.

Fig. 1.1 is a diagram showing the cellular processes involved in the production of a polypeptide of an antibody molecule (not drawn to scale).

Fig. 1.1

(a)

(i)

Name structures A, B and C.

A ______

B ______

C ______

(ii)

Name molecule D.

D ______

(iii)

State what is occurring at 1, 2 and 3.

at 1 ______

at 2 ______

at 3 ______

(b)

Antibodies are glycoproteins.

State what is meant by the term glycoprotein.

(c)

The genes responsible for antibody production are found on different chromosomes, such as chromosomes 2 and 14 in humans.

Explain how one antibody molecule is the product of more than one gene.

(d)

Describe and explain how the structure of an antibody molecule is related to its functions.

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