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Question 20N.2.SL.TZ0.2d

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.2.SL.TZ0.2d
Level SL Paper 2 Time zone TZ0
Command term Explain Question number d Adapted from N/A
d.
[Maximum mark: 3]
20N.2.SL.TZ0.2d

The photomicrograph below shows the protozoan Paramecium caudatum.

[Source: Deuterostome, CC BY-SA 3.0
https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons.]

(d)

Apart from the ribosomes, explain the evidence for the endosymbiotic theory of the origin of eukaryotic cells.

[3]

Markscheme

a. mitochondria/chloroplasts show features in common with prokaryotes/similar size;

b. multiply by binary fission/in same manner;

c. have naked loop of DNA/circular DNA/own DNA;

d. surrounded by a double membrane;

Syllabus sections