Robert Koch and his colleagues first used agar in bacteriological media.Why was this ingredient an improvement on previous materials used to culture bacteria?

Question

Quizplus · Accepted Answer

Agar is an improvement on previous materials because bacteria growing on the solidified medium did not degrade or break down the agar, unlike some of the nutrients that were previously used in the lab. This allowed for more consistent and reliable results. While agar does provide some nutrients for bacteria, it is not a complete source, so B is incorrect. Agar is not easily converted from liquid to solid form or vice versa, so A is also incorrect. There is no information provided to support D, so it cannot be assumed that agar was less expensive.

Robert Koch and His Colleagues First Used Agar in Bacteriological