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1.2 What happens in cells (and what do cells need)?

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Question 39
H

A student investigates the effect of temperature on the activity of an enzyme.

The student tests the enzyme at 20 ∘C20\ ^\circ\text{C}20 ∘C, 30 ∘C30\ ^\circ\text{C}30 ∘C, 40 ∘C40\ ^\circ\text{C}40 ∘C, 50 ∘C50\ ^\circ\text{C}50 ∘C and 60 ∘C60\ ^\circ\text{C}60 ∘C.

The rate of reaction is highest at 40 ∘C40\ ^\circ\text{C}40 ∘C.

How could the student find the optimum temperature more accurately?

[1]
A

Repeat the investigation at the same five temperatures.

B

Test temperatures at 2 ∘C2\ ^\circ\text{C}2 ∘C intervals from 30 ∘C30\ ^\circ\text{C}30 ∘C to 50 ∘C50\ ^\circ\text{C}50 ∘C.

C

Extend the range by also testing at 10 ∘C10\ ^\circ\text{C}10 ∘C and 70 ∘C70\ ^\circ\text{C}70 ∘C.

D

Use a larger volume of enzyme at each of the temperatures.

Markscheme

1.2 What happens in cells (and what do cells need)? Questions

  1. GCSE
  2. /Biology
  3. /1.2 What happens in cells (and what do cells need)?

184 exam-style questions on OCR GCSE Biology 1.2 What happens in cells (and what do cells need)?, covering 1.2.1 Structure of DNA, 1.2.2 Nucleotides and complementary bases, 1.2.3 Protein synthesis, 1.2.4 DNA structure and the proteins made, 1.2.5 Investigating enzymatic reactions, and 1.2.6 Mechanism of enzyme action. Each one has a worked solution and a mark scheme showing where the marks go.

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