Most antibiotics are produced by ________.

A. streptomyces
B. unicellular bacteria
C. protozoa
D. yeasts


Answer: A

Biology & Microbiology

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The RNA World hypothesis isdirectly supported by all the following except:

A. catalytic RNAs. B. ribozymes showing diverse function. C. ribosome structure. D. micelle to vesicle formation.

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You are at a stage in your research in which you must design an experiment to test your hypothesis. Which factors

must you include to ensure that you obtain valid data?

What will be an ideal response?

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How do protists assist termites in digesting wood?

a. They protect the termites’ gut from damage from the cellulose fibers. b. Enzymes produced by the protists break down carbon. c. Protists absorb nutrients from the wood in the termites’ guts. d. Enzymes produced by protists in the termites’ guts break down cellulose.

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Nephelometry measures the light scatter of

a. Ions b. Macromolecules c. Antibodies d. Soluble antigens e. All of the above

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