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Question 19M.3.HL.TZ1.11a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.HL.TZ1.11a
Level HL Paper 3 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.3.HL.TZ1.11a

Some halophilic bacteria biodegrade benzene, which makes them useful in treating oil spills as benzene is contained in crude oil. Investigators added cultures of the bacteria to benzene solutions at different salinities in containers. The amount of benzene remaining in the container was recorded once a week for two weeks.

[Source: adapted from C A Nicholson and B Z Fathepure, (2004),
Applied and Environmental Microbiology, 70 (2), pages 1222–1225]

(a)

Outline what is meant by halophilic when describing the bacteria.

[1]

Markscheme

thrive/live in a salt rich environment ✔

Examiners report

(a) to (c) These three questions were often answered well.

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