Skip to content

Course home

Sign up

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

EasyMediumHard
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849
Question 11
F

Biological washing powders contain enzymes. One of these enzymes is a protease, which breaks down protein stains such as egg and blood.

The label on a box of biological washing powder says:

'For best results, wash at 30 ∘C30\ ^\circ\text{C}30 ∘C to 40 ∘C40\ ^\circ\text{C}40 ∘C. Do not use in water above 60 ∘C60\ ^\circ\text{C}60 ∘C.'

a.

Explain why the washing powder does not remove protein stains in water above 60 ∘C60\ ^\circ\text{C}60 ∘C.

[3]
b.

Explain why the washing powder removes protein stains more slowly at 10 ∘C10\ ^\circ\text{C}10 ∘C than at 35 ∘C35\ ^\circ\text{C}35 ∘C.

[2]
c.

The protease does not remove fat stains.

Explain why.

[2]
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.

Question bank