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Date May 2017 Marks available 1 Reference code 17M.3.HL.TZ1.8
Level Higher level Paper Paper 3 Time zone Time zone 1
Command term Distinguish Question number 8 Adapted from N/A

Question

Distinguish between the structure of Gram-positive and Gram-negative bacteria. 

Markscheme

a. Gram-negative bacteria have a thinner peptidoglycan cell wall / Gram-positive bacteria have a thicker peptidoglycan cell wall 

b. Gram-negative bacteria have an additional membrane of «lipopolysaccharide and protein» outside the wall «whereas Gram-positive bacteria do not»

Examiners report

[N/A]

Syllabus sections

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