Multiple Choice
Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called:
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7. Prokaryotic Cell Structures & Functions
Introduction to Bacterial Cell Walls
Multiple Choice
Which of the following bacterial cell types is most sensitive to radiation damage?
A
Mycobacteria
B
Gram-positive bacteria
C
Archaea
D
Gram-negative bacteria
Verified step by step guidance1
Step 1: Understand the nature of radiation damage in bacteria. Radiation primarily causes damage to DNA, proteins, and cellular structures, leading to cell death or mutations.
Step 2: Consider the structural differences between the bacterial types listed. Gram-positive bacteria have a thick peptidoglycan layer but lack an outer membrane, whereas Gram-negative bacteria have a thinner peptidoglycan layer and an outer membrane that can provide some protection.
Step 3: Recognize that Mycobacteria have a unique, waxy cell wall rich in mycolic acids, which can offer some resistance to environmental stresses, including radiation.
Step 4: Archaea often have unique membrane lipids and cell wall structures that can confer resistance to extreme conditions, including radiation.
Step 5: Conclude that Gram-positive bacteria, despite their thick peptidoglycan layer, are generally more sensitive to radiation damage compared to Gram-negative bacteria and other types due to the absence of an outer membrane and less protective mechanisms.
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