Skip to content

Course home

Sign up

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

EasyMediumHard
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849
Question 12
F

DNA is made of two strands. The bases on one strand pair with the bases on the other strand.

Part of one strand of a DNA molecule has this base sequence:

A T T G C A G C

a.

Write the base sequence of the complementary strand.

[1]
b.

A DNA molecule contains 4000 bases. 22% of the bases are G.

Calculate the number of bases in the DNA molecule that are A.

[3]
c.

A student says:

'There are four different nucleotides in DNA because each nucleotide has a different sugar.'

Explain why the student is wrong.

[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