Question

Archaebacteria differ from bacteria in

• A. lacking peptidoglycan in the cell wall
• B. lacking membrane bound organelles
• C. containing circular chromosome
• D. containing formyl-methionine as an initiator amino acid

Hint:

Archaebacteria have unique features that distinguish them from bacteria, including the absence of peptidoglycan in their cell walls.

Answer 1

The Correct Option is A

Step 1: Understanding the difference between archaebacteria and bacteria.
Archaebacteria are distinct from regular bacteria in several ways, including their cell wall composition. One major difference is that archaebacteria lack peptidoglycan in their cell walls, unlike most bacteria, which do have peptidoglycan. This makes archaebacteria more similar to eukaryotic cells in this regard.

Step 2: Analyzing the options.
(A)lacking peptidoglycan in the cell wall: Correct — Archaebacteria lack peptidoglycan, which is a distinguishing feature compared to bacteria.
(B)lacking membrane-bound organelles: This is true for both archaebacteria and bacteria, so it's not a distinguishing feature.
(C)containing circular chromosome: Both archaebacteria and bacteria have circular chromosomes, so this is not a unique difference.
(D)containing formyl-methionine as an initiator amino acid: This is found in both archaebacteria and bacteria, so it does not distinguish the two.

Step 3: Conclusion.
The correct answer is (A)lacking peptidoglycan in the cell wall, as this is a key distinguishing factor between archaebacteria and bacteria.