Question

Which of the following statement(s) is/are CORRECT about Deinococcus radiodurans?

• A. It has a cell wall consisting of several layers, including an outer membrane that lacks lipid A
• B. Peptidoglycan in its cell wall has ornithine, in place of diaminopimelic acid, in the N-acetyl muramic acid cross-bridges
• C. It is a Gram-negative organism
• D. It can survive an exposure up to 15000 Gy of ionizing radiation

Hint:

Deinococcus radiodurans is a Gram-positive bacterium with extraordinary resistance to radiation.

Answer 1

The Correct Option is A

Step 1: Analyze the options.
- (A) Correct: Deinococcus radiodurans is known for its unique cell wall structure that includes several layers, and unlike typical Gram-negative bacteria, it lacks lipid A in the outer membrane.
- (B) Incorrect: Deinococcus radiodurans has ornithine in the peptidoglycan structure, but this does not replace diaminopimelic acid in cross-bridges.
- (C) Incorrect: Deinococcus radiodurans is a Gram-positive bacterium with a unique cell wall structure.
- (D) Correct: Deinococcus radiodurans is extremely radiation-resistant and can survive exposures up to 15000 Gy of ionizing radiation.
Step 2: Conclusion.
The correct statements are that Deinococcus radiodurans has a cell wall with several layers and lacks lipid A in its outer membrane, and it can survive extreme ionizing radiation exposure.
Final Answer: \[ \boxed{\text{Deinococcus radiodurans has a unique cell wall structure and is highly radiation-resistant.}} \]