Skip to content

Course home

Question bank·1.2 What happens in cells (and what do cells need)?
Sign up

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

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162
Question 5

A student investigates the effect of pH on the rate of a reaction catalysed by lipase.

The student uses buffer solutions at pH 4, 5, 6, 7 and 8. The temperature and lipase concentration are kept the same. Each pH value is tested three times and a mean rate is calculated.

The highest mean rate is at pH 6.

Which change would make the estimate of the optimum pH more precise?

[1]
A

Use a higher concentration of lipase at every pH value.

B

Record each mean rate using more digits after the decimal point.

C

Increase the temperature by the same amount at every pH value.

D

Test additional buffer solutions with pH values close to pH 666.

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.

More questions