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

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Question 4

Amylase extracted from germinating barley is mixed with starch solution in a test tube. Ten minutes later, one drop is taken from the tube and placed in a well containing iodine solution.

The iodine solution turns blue-black. Which conclusion is supported by this observation?

[1]
A

Starch is still present in the reaction mixture.

B

All the starch has been broken down into sugars.

C

The amylase has been used up during the reaction.

D

Sugars are present in the reaction mixture.

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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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