DP Biology (last assessment 2024)

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Question 18N.3.HL.TZ0.a

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.HL.TZ0.a
Level HL Paper 3 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
18N.3.HL.TZ0.a

Outline the characteristics which would indicate biofilm formation in Bacillus subtilis.

[2]

Markscheme

a. bacteria/B. subtilis adhere to surfaces ✔

b. «bacteria/B. subtilis» grow surrounded by EPS/exopolysaccharide/extracellular polymeric substance matrix ✔

c. «bacteria/B. subtilis growing in a biofilm» are highly resistant to antimicrobial agents ✔

d. «bacteria/B. subtilis in biofilms» cooperate through quorum sensing ✔

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