What is the difference between Gram-positive and Gram-negative bacteria?

a. Gram-positive bacteria are surrounded by a single membrane, whereas Gram-negative bacteria are surrounded by a double membrane, with an outer membrane that is porous to ions and small molecules.
b. Gram-positive bacteria make gramicidin A and Gram-negative bacteria do not.
c. Gram-positive bacteria are surrounded by a single membrane, while Gram-negative bacteria have a dual-membrane system with an inner membrane that is porous to small molecules and ions.
d. Gram-positive bacteria are motile and Gram-negative bacteria are not.


Ans: a. Gram-positive bacteria are surrounded by a single membrane, whereas Gram-negative bacteria are surrounded by a double membrane, with an outer membrane that is porous to ions and small molecules.

Biology & Microbiology

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