Biology 9700 · AS & A Level · Testing for biological molecules

Testing for biological molecules — practice question

Cells are made up of carbohydrates, proteins, lipids and nucleic acids.
(a)[5]

Fig. 5.1 shows a set of biological molecules, some of which serve as parts of larger molecules. Use only the molecules named in Fig. 5.1 to complete Table 5.1. An example may be written beneath one or more suitable headings. Every example in Fig. 5.1 must appear at least once in Table 5.1.

(b)[3]

Explain how phospholipid structure enables the formation of the phospholipid bilayer in cell membranes.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: Glycine is placed correctly under monomer only

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