DP Biology (last assessment 2024)

Question 18M.3.SL.TZ2.a.ii

Date	May 2018	Marks available	[Maximum mark: 1]	Reference code	18M.3.SL.TZ2.a.ii
Level	SL	Paper	3	Time zone	TZ2
Command term	Predict	Question number	a.ii	Adapted from	N/A

a.ii.

[Maximum mark: 1]

18M.3.SL.TZ2.a.ii

Vinegar is a water-based solution of ethanoic acid. Acetobacter aceti is used in the production of vinegar. This bacterium has the ability to convert ethyl alcohol, C₂H₅OH, into ethanoic acid, CH₃COOH.

A. aceti is a Gram-negative bacterium. If a Gram staining procedure were carried out on a sample of A. aceti, predict the result that would be observed after counterstaining.

[1]

Markscheme

would stain pink

Do not accept “violet” or “lilac”.

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Option B: Biotechnology and bioinformatics

Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics) » B.1 Microbiology: organisms in industry

Option B: Biotechnology and bioinformatics » Option B: Biotechnology and bioinformatics (Core topics)

Question 18M.3.SL.TZ2.a.ii

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