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

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Question 16

A quality-control technician measures how long an enzyme-controlled reaction takes for the substrate to disappear. The same volume and concentration of substrate are used in both tests.

TestResult
AThe substrate disappears in 200 s.
BThe rate of reaction is 2.5 times the rate in test A.

Which calculation gives the time taken for the substrate to disappear in test B?

[1]
A

200 s÷2.5200\ \text{s} \div 2.5200 s÷2.5

B

2.5÷200 s2.5 \div 200\ \text{s}2.5÷200 s

C

1200 s×2.5\dfrac{1}{200\ \text{s} \times 2.5}200 s×2.51​

D

200 s×2.5200\ \text{s} \times 2.5200 s×2.5

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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