A-level BIOLOGY (7402/1) Paper 1 Specimen 2014

A-level
BIOLOGY
(7402/1)
Paper 1

Specimen 2014 Session Time allowed: 2 hours
Materials
For this paper you must have:
• a ruler with millimetre measurements
• a calculator.

Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at the bottom of this page.
• Answer all questions.

Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 91.




Please write clearly, in block capitals, to allow character computer recognition.

Centre number Candidate number

Surname

Forename(s)


Candidate signature

, 2




Answer all questions in the spaces provided.


1 A technician investigated the effect of temperature on the rate of an enzyme-controlled
reaction. At each temperature, he started the reaction using the same concentration
of substrate.

Figure 1 shows his results.




0 1 . 1 Give two other factors the technician would have controlled.
[1 mark]

1

2




0 1 . 2 Draw a tangent on each curve to find the initial rates of reaction.
Use these values to calculate the ratio of the initial rates of reaction at 60 ° C : 37 ° C.
Show your working.
[2 marks]




Ratio = _____________________ 1

, 3



0 1 . 3 Explain the difference in the initial rate of reaction at 60 ° C and 37 ° C.
[2 marks]




0 1 . 4 Explain the difference in the rates of reaction at 60 ° C and 37 ° C between 20 and
40 minutes.
[4 marks]




[Extra space]




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