Suppose You Are Given Unlabeled Cultures of Colonies of Cyanobacteria

Multiple Choice

Suppose you are given unlabeled cultures of colonies of cyanobacteria and purple sulfur bacteria.How can you use an obligate aerobic eukaryotic organism to test which colonies are which?

A) Add the aerobe to each culture;cyanobacteria will be toxic to other organisms.
B) Add the aerobe to each culture;purple sulfur bacteria will be toxic to other organisms.
C) Add the aerobe to each culture;cyanobacteria will provide the required oxygen if allowed to photosynthesize.
D) Add the aerobe to each culture;purple sulfur bacteria will provide the required oxygen if allowed to photosynthesize.
E) The aerobe cannot be used to test which colonies are which.