DP Biology (first assessment 2025)

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Question 21N.1A.HL.TZ0.28

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Date November 2021 Marks available [Maximum mark: 1] Reference code 21N.1A.HL.TZ0.28
Level HL Paper 1A Time zone TZ0
Command term Question number 28 Adapted from N/A
28.
[Maximum mark: 1]
21N.1A.HL.TZ0.28

The graph shows changes in the membrane potential in an action potential.

What is the approximate value of the threshold potential?

A. −88 mV

B. −70 mV

C. −50 mV

D. +45 mV

[1]

Markscheme

C

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