DP Biology (first assessment 2025)

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Question 19N.2.HL.TZ0.6a

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.2.HL.TZ0.6a
Level	HL	Paper	2	Time zone	TZ0
Command term	Define	Question number	a	Adapted from	N/A

a.

[Maximum mark: 1]

19N.2.HL.TZ0.6a

(a)

Define neurotransmitter.

[1]

Markscheme

chemical substance that transmits message across synapses/from one cell to another ✔

OWTTE
Do not accept "connection" instead of "synapse".

Syllabus sections

C. Interaction and interdependence » C2.1. Chemical signalling [HL only] » C2.1.3. Hormones, neurotransmitters, cytokines and calcium ions as examples of functional categories of signalling chemicals in animals

C. Interaction and interdependence » C2.1. Chemical signalling [HL only] » C2.1.4. Chemical diversity of hormones and neurotransmitters