Multiple Choice
Gram-negative bacteria have __________ peptidoglycan than gram-positive cells, and their cell walls are __________ complex structurally.
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26. Prokaryotes
Prokaryotic Cell Structure
Multiple Choice
The bacteria that cause tetanus can be killed only by prolonged heating at temperatures considerably above boiling. This suggests that these bacteria __________.
A
have cell walls containing peptidoglycan
B
protect themselves by secreting antibiotics
C
secrete endotoxins
D
are autotrophic
E
produce endospores
Verified step by step guidance1
Understand the problem: The question is about the characteristics of bacteria that cause tetanus and why they can only be killed by prolonged heating at high temperatures.
Recall the concept of endospores: Endospores are a type of dormant, tough, and non-reproductive structure produced by certain bacteria. They are highly resistant to extreme conditions, including heat, desiccation, chemicals, and radiation.
Consider the options: The options provided are related to bacterial structures and functions. We need to identify which characteristic allows the bacteria to survive extreme heat.
Analyze the options: Peptidoglycan in cell walls, secretion of antibiotics, endotoxins, and being autotrophic do not inherently provide resistance to high temperatures. However, the production of endospores is known for providing such resistance.
Conclude: The ability of the bacteria to survive prolonged heating at temperatures above boiling is due to their production of endospores, which are highly resistant to extreme environmental conditions.
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