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

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Question 28
F

A student investigates the breakdown of hydrogen peroxide by catalase in potato.

The student counts the bubbles of oxygen given off in one minute.

The teacher suggests collecting the oxygen in a gas syringe instead.

Why is using a gas syringe a better method?

[1]
A

The bubbles are produced too slowly, so counting takes too long.

B

The bubbles contain carbon dioxide, so only oxygen should be counted.

C

The gas syringe speeds up the reaction, so results are obtained faster.

D

The bubbles may be different sizes, so measuring volume is more accurate.

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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