Biology 9700 · AS & A Level · Testing for biological molecules
Testing for biological molecules — practice question
Fig. 5.1 illustrates a segment of a DNA molecule.
(a(i))[1]
On Fig. 5.1, draw a box around a nucleotide.
(a(ii))[1]
On Fig. 5.1, label a phosphate group with the letter P.
(b)[5]
Describe how a DNA molecule replicates.
(c)[3]
DNA contains the code for polypeptides in cells. Transfer RNA (tRNA) is involved in this process. Describe the role of tRNA in the production of polypeptides in cells.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A box is drawn accurately around the phosphate, sugar and base.” …