unit 1 biochemistry questions - thiacin...unit 1 general biochemistry questions question book 1...
TRANSCRIPT
NAME:____________________________ OPTION GROUP______________________
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
Detailed Feedback
11
12