9700 W05 Qp 2

Topics: Amino acid, Cell membrane, Protein Pages: 16 (1870 words) Published: February 4, 2015
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Name

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Candidate Number

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Centre Number

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education
Advanced Subsidiary Level and Advanced Level

9700/02

BIOLOGY
Paper 2 Structured Questions AS

October/November 2005
1 hour 15 minutes
Candidates answer on the Question Paper.
No Additional Materials are required.

READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name in the spaces provided at the top of this page. Write in dark blue or black pen in the spaces provided on the Question Paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions.

The number of marks is given in brackets [ ] at the end of each question or part question.

FOR EXAMINER’S USE

1
2
If you have been given a label, look at the
details. If any details are incorrect or
missing, please fill in your correct details
in the space given at the top of this page.
Stick your personal label here, if
provided.

3
4
5
6
TOTAL

This document consists of 15 printed pages and 1 blank page. SP (NF/CGW) S86392/2
© UCLES 2005

[Turn over

For
Examiner’s
Use

2
Answer all the questions.

1

Fig. 1.1 is a drawing made from an electron micrograph of a goblet cell from the epithelium of the gas exchange system.

mucus 'plug'

vesicle
containing
mucus
A

B

C

Fig. 1.1
(a) Name A to C.
A ....................................................................................................................................... B ....................................................................................................................................... C ...................................................................................................................................[3] (b) State two places in the gas exchange system where goblet cells are found. 1. ...................................................................................................................................... 2. ..................................................................................................................................[1]

© UCLES 2005

9700/02/O/N/05

3
Mucus contains a number of different glycoproteins, called mucins. These have a protein ‘core’ that is formed by repeated sequences of amino acids, some of which have carbohydrates attached to their side chains (R groups). A part of one of these repeated units is shown diagrammatically in Fig. 1.2.

For
Examiner’s
Use

carbohydrate
chains

protein
'core'
Fig. 1.2
(c) Use label lines and the letters P and G to indicate on Fig. 1.2 the positions of: P – a peptide bond;
G – a glycosidic bond.

[2]

(d) Describe the role of mucus in the gas exchange system.
.......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[3] (e) Glycoproteins are found in cell surface membranes.

State one function of these glycoproteins....
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