Question

Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaption. These imprints need to be used?

• A. On plates with an without streptomycin
• B. On plants with minimal medium
• C. Only on plates with streptomycin
• D. Only on plates without streptomycin

Answer 1

The correct option is C Only on plates with streptomycin

Plates having streptomycin allow to propagate only those bacteria which are resistant to the antibiotic. While those plates in which streptomycin is absent, both resistant and non-resistant bacteria can grow normally.

So, the correct option is 'Only on plates with streptomycin'.