Bacteria perform the following ecological roles. Which role typically does not involve symbiosis?a. skin commensalistb. decomposerc. gut mutualistd. pathogen

In terms of nutrition, autotrophs are to heterotrophs asa. kelp are to diatoms.b. archaea are to bacteria.c. slime molds are to algae.d. algae are to slime molds.

Explain how feedback inhibition regulates metabolic pathways.

Which of the following involves metabolic cooperation among prokaryotic cells?a. binary fissionb. endospore formationc. biofilmsd. photoautotrophy

Which of the following describes a bacterium that lives in the human intestine and causes disease?(A)commensalist(B)decomposer(C)gut mutualist(D)symbiotic pathogen

Biologists often use the term 'energy source' as a synonym for 'electron donor.' Why?

Using what you have learned about changes in Gibbs free energy, would you predict the ∆G value of catabolic reactions to be positive or negative? What about anabolic reactions? Justify your answers using the terms 'enthalpy' and 'entropy.'

Explain why prokaryote populations can adapt rapidly to changes in their environment.

Streptococcus mutans obtains energy by oxidizing sucrose. This bacterium is abundant in the mouths of Western European and North American children and is a prominent cause of cavities. The organism is virtually absent in children from East Africa, where tooth decay is rare. Propose a hypothesis to explain this observation. Outline the design of a study that would test your hypothesis.