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Question 19N.2.HL.TZ0.b

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

This light micrograph shows skeletal muscle.

[Source: adapted from https://en.wikipedia.org/wiki/Skeletal_muscle#/media/File:Skeletal_
muscle_%E6%A8%AA%E7%BA%B9%E8%82%8C1.JPG, Urana/ 乌拉跨氪]

Discuss whether the tissue shown in the micrograph consists of cells or not.

[2]

Markscheme

a. «muscle fibres are» multinucleate/contain many nuclei «whereas cells are expected to have only one/so muscle fibers are an exception to the cell theory» ✔

b. one cell membrane/sarcolemma enclosing a whole muscle fibre «as expected for cells» ✔

c. very large/much larger/longer/than most cells ✔

d. muscle fibres formed by fusion of cells/are syncytia ✔

Syllabus sections