Question

Gram stain represents

• A. A technique for staining bacteria and developed by Gram
• B. A stain got from Gram
• C. A cytochemical technique for differentiation of mitochondria
• D. A trade name

Answer 1

The correct option is A A technique for staining bacteria and developed by Gram

There are various ways in which bacteria are classified based on the basis of shape, cell wall, flagella, nutrition, and morphology. The bacteria are classified on the basis of staining as gram-positive and gram-negative bacteria because of their different cell wall constituents. Gram stain represents a technique for staining bacteria and it was developed by a Danish scientist Hans Christian Joachim Gram. Gram-positive bacteria retain the gram stain and appear violate under the microscope after gram staining. An example includes Streptococcus aureus. Gram-negative bacteria do not retain the gram stain and they take up the red color of the counterstain in gram staining process. For example, Escherichia coli.

Thus, the correct answer is 'A technique for staining bacteria and developed by Gram.'