Unit 1 Biochemistry Questions - thiacin...Unit 1 General Biochemistry Questions Question Book 1...

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WJEC  

Unit 1 General 

Biochemistry Questions Question Book 1 

(legacy Qs from Jan 2000 to Jan 2009 and Jan 

2009 to June 2015)  

Homework Question Number(s)  

Due Date & Pass Mark 

Mark  

Resist Question number(s) 

Resist Due Date & Pass 

Mark 

Mark  Resit 

1

2

3

4

5

6

2 Examineronly

(1071-01)

1. Below is a list of chemicals which may be found in cells.

A magnesium F calciumB maltose G phosphateC amino acid H waterD cellulose I sucroseE iron

Each of the following statements applies to one or more of these chemicals.After each statement, write in the box the letter or letters which correspond(s) to the chemical(s)being described. Each letter may be used once, more than once, or not at all.

(a) Found in bones and teeth.

(b) A non-reducing sugar

(c) Found in chlorophyll in leaves.

(d) A polysaccharide found in plant cell walls.

(e) Found attached to lipids in the plasma membrane.

(f) A large quantity of energy is needed to raise its temperature.(Total 6 marks)

2. (a) The level of protein structure is decided by the folding of the molecule and the types ofbonds present.

Tick (√) the boxes in the table to show all the bonds present at each level of proteinstructure. [3]

(b) (i) How does the quaternary structure of a protein differ from the tertiary structure? [1]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(ii) Give an example of a quaternary protein. [1]

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(Total 5 marks)

Tertiary

peptide hydrogen disulphide ionic

Primary

Secondary

Level of proteinstructure

Types of bonds

7

(1071-01)

1. Inorganic ions are needed by living organisms. Complete the table below to give a function foreach of the four ions. [4]

2Examiner

only

Ion

Magnesium

Iron

Phosphate

Calcium

Function

(Total 4 marks)

2. Complete the following passage by inserting the correct terms in the spaces provided. [6]

Cellulose is a fibrous molecule. It is a carbohydrate and is the main component of the

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . of plants. Cellulose consists of chains of

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . glucose molecules which are joined together by

1-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . bonds. Each adjacent glucose molecule is rotated by

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .o resulting in a chain. Chains are held together by

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . bonds forming groups of chains known as . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(Total 6 marks)

BY1 1/11 8

2

(1071-01)02

Examineronly

Answer all questions.

1. The following diagrams represent the structure of some common organic molecules.

© WJEC CBAC Ltd.

5C

6CH2OH

O

H1C

OH

3C

H

H

2C

OH

H

O

H4C

OH OH

5C

6CH2OH

O

H1C

OH

3C

H

H

2C

OH

HH4C

α 1,4 link

5C6CH2OH

O

H1C

OH

3C

H

H

2C

OH

H

OH

H

4C

OH

C

H O

H C OH

CH2OH

C

O

COOH

SH

H

H2N

C 2H

5CH2OHO

H

4C

OHH

3C 2C

OH

H

H

1C

OH

A B

N C C

H

H

N C C

O

H H

H

H OH

OH

C D

C C

H

H

C

H

H

C

H

H

C

H

H

C

H

C C C

H

HH H OH

OHH

C

CH

H

C

H

H

C

H

H

C

H

H

CH

C

H

H

H

H

C

C

HH

H

H

H

E F

G

BY1 2/159

(1071-01) Turn over.

10

710

10

00

3

03

3Examiner

only (a) Using letters A-G, complete the table below. You may use each letter once, more than

once or not at all. [7]

(b) (i) Describe a biochemical test for the presence of glucose in a solution. [2]

(ii) Explain why a positive result is seen with glucose but not for sucrose. [1]

© WJEC CBAC Ltd.

Statement Letter(s)

is a monosaccharide

is a dipeptide

would be found in nucleic acids

contains C ��C bonds

contains a glycosidic bond

is a triose sugar

10

BY1 2/1510

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