Question

hans: now let me ask you a question: do you know what the two groups that i am talking about are named?
a) gram - visible and gram - invisible
b) gram - positive and gram - negative
c) gram - variable and gram - constant
d) gram - cocci and gram - rods

Explanation:

Gram - staining is a common method in microbiology. Bacteria are classified into two main groups based on the Gram - staining procedure. Gram - positive bacteria retain the crystal violet stain due to their thick peptidoglycan layer in the cell wall. Gram - negative bacteria do not retain the crystal violet stain well as they have a thinner peptidoglycan layer and an outer membrane. Options a), c), and d) are not the correct standard terms for the two main groups in Gram - staining.

Answer:

B. Gram - positive and Gram - negative