The cell walls of fungi are composed mainly of ____

a. Cellulose
b. Lignin
c. Chitin
d. Pectin
e. protein


ANSWER: c

Biology & Microbiology

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E. coli 0157:H7

A. is Gram-positive. B. is a normal constituent of the intestinal tract. C. does not ferment sorbitol. D. produces a toxin. E. does not ferment sorbitol AND produces a toxin.

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Which of the following is a characteristic of living organisms?

A) Maintenance and regulation of internal conditions B) Ability to produce energy C) Have a nucleus D) Eat other organisms E) Have membrane-bound organelles

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Speciation occurs ____.

A. after populations become reproductively isolated B. when mutations generate observable differences C. when transitional forms develop between different populations D. when natural selection pressures reach their maximum E. randomly as mutations build up in a population

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Which of the following statements is false about quorum sensing?

A) Quorum sensing allows bacteria to alter their protein synthesis in response to changes in population density. B) Quorum sensing allows unicellular organisms to coordinate their processes. C) Bacteria can communicate using chemical messengers called autoinducers. D) Coordinated protein synthesis through quorum sensing is the foundation for forming biofilms. E) Bacteria that experience quorum sensing have a decreased chance of survival.

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