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

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Question 16

A technician follows the breakdown of starch by amylase. Samples are added to iodine solution and their colour is measured using a colorimeter.

The reaction is repeated using four different recording schedules. The table shows the final time at which starch was detected and the first time at which starch was not detected.

RunFinal time starch was detected (s\mathrm{s}s)First time starch was not detected (s\mathrm{s}s)
17278
27080
36090
460120

Which run gives the most precise measurement of the end-point time?

[1]
A

Run 3

B

Run 4

C

Run 2

D

Run 1

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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