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

Structure of nucleic acids and replication of DNA — practice question

Fig. 1.1 displays the structures of four biological molecules A, B, C and D.
(a(i))[1]

State the letter, A to D, of the molecule in Fig. 1.1 that is a nucleotide.

(a(ii))[1]

State the letter, A to D, of the molecule in Fig. 1.1 that can make peptide bonds.

(a(iii))[1]

State the letter, A to D, of the molecule in Fig. 1.1 that has ester bonds.

(b(i))[1]

Some molecules in Fig. 1.1 are able to form polymers. Name one polymer that can be formed only from many molecules of C.

(b(ii))[1]

State one visible difference in Fig. 1.1 between the part labelled 1 of molecule A and the part labelled 2.

(b(iii))[2]

Molecule D can make macromolecules with other similar monomers. The three-dimensional shapes of these macromolecules are held together by interactions or bonds other than those between adjacent monomers. Name two of these interactions or bonds.

Worked solution & mark scheme

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