Cambridge International AS & A Level
Your text here 1
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BIOLOGY 9700/22
Paper 2 AS Level Structured Questions February/March 2021
1 hour 15 minutes
You must answer on the question paper.
No additional materials are needed.
INSTRUCTIONS
● Answer all questions.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator.
● You should show all your working and use appropriate units.
INFORMATION
● The total mark for this paper is 60.
● The number of marks for each question or part question is shown in brackets [ ].
This document has 16 pages. Any blank pages are indicated.
DC (MB/SG) 200195/2
© UCLES 2021 [Turn over
, 2
Answer all questions.
1 (a) Fig. 1.1 is an image of a transverse section through the trachea of the gas exchange system.
lumen of trachea
ciliated epithelium
perichondrium
X ........................................................
Y ........................................................
Fig. 1.1
Write the names of structures X and Y on Fig. 1.1 in the boxes provided. [2]
(b) The perichondrium contains collagen fibres, composed of collagen molecules.
Collagen is an example of one type of biological molecule.
State the name of the type of biological molecule of which collagen is an example.
............................................................................................................................................. [1]
(c) Some structures in the gas exchange system are listed in alphabetical order in Table 1.1.
• Write YES in the box provided if the structure contains smooth muscle.
• Write NO in the box provided if the structure does not contain smooth muscle.
Table 1.1
alveolus
bronchiole
bronchus
trachea
[1]
[Total: 4]
© UCLES 2021 9700/22/F/M/21
, 3
2 Starch molecules are the main storage molecules in many types of cereal grain, such as the grain
of the barley plant.
(a) When the seed inside a barley grain germinates, genes coding for digestive enzymes are
switched on. The enzymes that are synthesised catalyse the hydrolysis of storage molecules
such as proteins and starch.
(i) Explain what is meant by a gene.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) The hydrolysis of proteins in the barley seed produces amino acids that can be used in
the synthesis of the proteins required for formation of the seedling (young plant).
Fig. 2.1 is an incomplete diagram of the molecular structure of the smallest amino acid,
glycine. Each molecule of glycine has two carbon atoms.
H
C C
H
Fig. 2.1
Complete Fig. 2.1 to show the molecular structure of glycine. [2]
(iii) Starch is a mixture of two different molecules.
Name these two molecules.
...........................................................................................................................................
..................................................................................................................................... [1]
© UCLES 2021 9700/22/F/M/21 [Turn over
Your text here 1
* 5 1 5 8 6 5 0 0 7 8 *
BIOLOGY 9700/22
Paper 2 AS Level Structured Questions February/March 2021
1 hour 15 minutes
You must answer on the question paper.
No additional materials are needed.
INSTRUCTIONS
● Answer all questions.
● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use a calculator.
● You should show all your working and use appropriate units.
INFORMATION
● The total mark for this paper is 60.
● The number of marks for each question or part question is shown in brackets [ ].
This document has 16 pages. Any blank pages are indicated.
DC (MB/SG) 200195/2
© UCLES 2021 [Turn over
, 2
Answer all questions.
1 (a) Fig. 1.1 is an image of a transverse section through the trachea of the gas exchange system.
lumen of trachea
ciliated epithelium
perichondrium
X ........................................................
Y ........................................................
Fig. 1.1
Write the names of structures X and Y on Fig. 1.1 in the boxes provided. [2]
(b) The perichondrium contains collagen fibres, composed of collagen molecules.
Collagen is an example of one type of biological molecule.
State the name of the type of biological molecule of which collagen is an example.
............................................................................................................................................. [1]
(c) Some structures in the gas exchange system are listed in alphabetical order in Table 1.1.
• Write YES in the box provided if the structure contains smooth muscle.
• Write NO in the box provided if the structure does not contain smooth muscle.
Table 1.1
alveolus
bronchiole
bronchus
trachea
[1]
[Total: 4]
© UCLES 2021 9700/22/F/M/21
, 3
2 Starch molecules are the main storage molecules in many types of cereal grain, such as the grain
of the barley plant.
(a) When the seed inside a barley grain germinates, genes coding for digestive enzymes are
switched on. The enzymes that are synthesised catalyse the hydrolysis of storage molecules
such as proteins and starch.
(i) Explain what is meant by a gene.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
..................................................................................................................................... [2]
(ii) The hydrolysis of proteins in the barley seed produces amino acids that can be used in
the synthesis of the proteins required for formation of the seedling (young plant).
Fig. 2.1 is an incomplete diagram of the molecular structure of the smallest amino acid,
glycine. Each molecule of glycine has two carbon atoms.
H
C C
H
Fig. 2.1
Complete Fig. 2.1 to show the molecular structure of glycine. [2]
(iii) Starch is a mixture of two different molecules.
Name these two molecules.
...........................................................................................................................................
..................................................................................................................................... [1]
© UCLES 2021 9700/22/F/M/21 [Turn over
