Edexcel A-Level Biology A2 8.8 Rod Cells and Stimulus Detection Questions

Identify rhodopsin and its retinal–opsin components, trace light-triggered sodium-channel closure and rod-cell hyperpolarisation, and connect altered transmitter release to optic impulses.

Exam points

identify rhodopsin as the light-sensitive rod pigment formed from retinal and opsin
explain sodium-channel closure and rod-cell hyperpolarisation after light absorption
trace retinal change and rhodopsin splitting to altered optic-neurone signalling

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The photograph shows the eyes of a meerkat.

Figure for Question Edexcel A-Level Biology A2 8.8 Rod Cells and Stimulus Detection Questions question 1 — Edexcel A-Level Biology A2

Photoreceptors stimulate nerve transmission in the eye.

Which of the following pairs of molecules forms the photoreceptor in an eye?

auxin and retinol

lysozyme and ribose

opsin and retinal

phytochrome and opsin

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Edexcel A-Level Biology A2 8.8 Rod Cells and Stimulus Detection Questions question 1