Biology 5090 · O Level · DNA

DNA — practice question

A cell nucleus contains DNA molecules, and these molecules control cell function. Fig. 6.1 shows a diagram of one of these DNA molecules.

(a(i))[1]

Using Fig. 6.1, state the name of the structure marked P.

(a(ii))[1]

Using Fig. 6.1, state the name of the DNA unit marked Q.

(a(iii))[1]

Using Fig. 6.1, state the letter of the base that forms a pair with G.

(b)[4]

Explain how this DNA molecule controls cell function. Give one example in your answer.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “a chromosome” …