Question

A researcher claims that different metabolic pathways allow bacteria to use different molecules as sources of matter and energy. Which of the following statements best helps justify the researcher’s claim by providing a relevant example?a.Rhizobia bacteria form close associations with the roots of bean plants.b. coli bacteria reproduce in liquid media containing either glucose or galactose.c.The antibiotic rifampicin inhibits the growth of some bacterial strains but not of others.d. Some viruses that infect bacteria reproduce by either the lysogenic cycle or the lytic cycle.

Answer 1

Answer: E.coli bacteria reproduce in liquid media containing either glucose or galactose

Explanation:

Answer 2

Answer:

Option B

Explanation:

E.coli has a preference of glucose over other energy molecules and therefore whenever glucose it present, it leaves no chance of metabolizing and using it as a source of energy.  

However, in absence of glucose E.coli uses alternative energy sources such as galactose, maltose, lactose, arabinose etc. Therefore, it is clear that in order to sustain, an organism or bacteria follows multiple metabolic pathways to derive energy from various energy sources.

Hence, option B is correct.