One theory for the formation of proteins on the primitive earth suggests that they formed on

a. sedimentary rock.
b. igneous rock.
c. mud.
d. bodies of water.
e. clay.


E

Biology & Microbiology

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Which of the following traits is NOT characteristic of Caulobacter?

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Structures that are no longer needed but remain within the body are called

a. vestigial structures. b. nonuseful structures. c. ancient structures. d. defunct structures. e. retrostructures.

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The absence of significant contamination is referred to as

A. sepsis. B. bacteriostasis. C. asepsis. D. biocide.

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After many years of testing, an hypothesis becomes accepted as a

a. problem. b. theory. c. conclusion. d. variable. e. control.

Biology & Microbiology