Biology 9700 · AS & A Level · Protein synthesis

Protein synthesis — practice question

Fig. 1.1 shows a transmission electron micrograph of a cell taken from the stem of sago pondweed, S. pectinata.
(a(i))[1]

State the feature in Fig. 1.1 that shows the cell came from the stem of S. pectinata rather than the mesophyll of a leaf.

(a(ii))[4]

Fill in each row of Table 1.1 by naming a cell structure visible in Fig. 1.1 that performs the stated function.

(b(i))[1]

Name the process taking place at X.

(b(ii))[3]

Some vesicles from the Golgi body move to the vacuole. These vesicles carry some proteins that have folded correctly and others that have not. The incorrectly folded proteins are sent to the vacuole, where they are broken down. Explain how proteins that have not folded correctly are broken down in the vacuole.

(c)[2]

Describe the role of lysosomes in animal cells in defending against pathogens.

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This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: Chloroplasts are absent

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