Pearson Edexcel International A Level · Biology (YBI11)

Neurones, Synapses and Drug Action: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Neurones, Synapses and Drug Action.

10 questions24 marksFree, no account

Question 1

1 mark

Which enzyme is used in gene technology to join two fragments of DNA together by forming phosphodiester bonds?

Question 2

1 mark

During the transmission of a nerve impulse along a myelinated axon, how does saltatory conduction increase conduction velocity?

Question 3

1 mark

An investigator applies repeated non-harmful tactile stimuli to the siphon of a sea slug (Aplysia) and observes habituation of the gill withdrawal reflex. Which cellular mechanism accounts for this reduced response?

Question 4

1 mark

Which plant hormone stimulates the production of amylase in the aleurone layer of germinating cereal grains?

Question 5

1 mark

Which of the following occurs in a rod cell of the mammalian retina when it is in the dark?

Question 6

2 marks

State the specific function of Schwann cells in the structure of a motor neurone.

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Question 7

4 marks

Describe how the binding of acetylcholine to receptors on the post-synaptic membrane initiates a new nerve impulse.

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Question 8

6 marks

Explain the molecular mechanism by which rhodopsin responds to light to trigger hyperpolarisation in rod cells.

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Question 9

2 marks

The human brain consists of several specialized regions.

(a) Identify the region of the brain responsible for thermoregulation and osmoregulation.

(b) Describe the primary function of the cerebellum.

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Question 10

5 marks

Plants utilize complex signaling pathways involving hormones and photoreceptors to coordinate their growth in response to environmental changes.

(a) Describe the interconversion of the two forms of phytochrome, \(P_{r}\) and \(P_{fr}\), and explain which form triggers seed germination in many species. (3)

(b) Explain the mechanism by which auxin (IAA) causes the elongation of cells on the shaded side of a plant shoot during a phototropic response. (2)

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