Which statement best characterizes Gram-negative bacteria?

Question

Which statement best characterizes Gram-negative bacteria?

A. They have a thin peptidoglycan layer in their cell wall.
B. They turn purple when treated with Gram stain.
C. They live in extreme environments.
D. They contain a distinct membrane-enclosed nucleus.

Answer 1

A. They have a thin peptidoglycan layer in their cell wall.

Answer 2

A is true.

Not B. Turning purple is gram-positive.
Not C. Those are the archaebacteria.
Not D. All bacteria are prokaryotes and have no membrane-bound nucleus.

Answer 3

A