Question

You are given an electron micrograph of a bacterial cell. In the micrograph you can clearly see three thin layers of different densities surrounding the cell. Based on the micrograph, you can infer that this cell is ________ and would appear ________ after application of the Gram stain procedure.

gram-negative / pink
gram-positive / purple
gram-positive / pink
gram-negative / purple

Answer 1

GRAM NEGATIVE PINK AND THEN GRAM NEGATIVE PURPLE

Answer 2

The answer is ; GRAM POSITIVE / PURPLE

Gram-positive bacteria have a cell wall mainly composed of peptidoglycan layer and teichoic acid embedded within the peptidoglycan layers. This is why the gram-positive bacteria are able to retain the gram stain and remain purple even after washing with alcohol.