| 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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