Biology · May / June 2025 · Paper 41 · Question 5

A - hair / external ears ;

B – wings / feathers ;

apes and rodents ;

most similar – birds ;

least similar – sharks ;

any four from:

1

ref. to two strands / chains ;

2

double helix ;

3

ref. to four bases / A, T, C, G ;

4

A pairs with T and C pairs with G ;

5

ref. to bonds between bases ;

any three from:

(base sequences of DNA / mRNA) determine sequence of amino acids ; amino acids form proteins / protein synthesis / production of proteins ; named example of protein ;

ref. to sequence of amino acids determining protein shape ;