Biology 9700 · AS & A Level · Structure of nucleic acids and replication of DNA

Structure of nucleic acids and replication of DNA — practice question

In a cell that is dividing, DNA replication takes place before mitosis.
(a)[6]

The stages of DNA replication are shown in Fig. 6.1. Complete Fig. 6.1 by inserting the most suitable terms into the gaps.

(b(i))[3]

Name the stage of mitosis shown in each of cells J, K and L in Fig. 6.2. Put your answer in the space next to each letter on Fig. 6.2.

(b(ii))[1]

Explain how it is possible to tell that the labelled interphase cell shown in Fig. 6.2 is in late, rather than early, interphase.

(b(iii))[2]

Describe the stage of mitosis shown in cell J.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: Bases: adenine, thymine, cytosine, guanine

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