A(n) ________ provides support and protection to arthropods

A) epidermis
B) hydrostatic skeleton
C) cytoskeleton
D) shell
E) exoskeleton


E

Biology & Microbiology

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Subway air and water distribution systems harbor dangerous levels of pathogenic microorganisms

Indicate whether the statement is true or false.

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Which of the following characteristics of the glmS riboswitch is also true of the TPP riboswitch?

A. The glmS riboswitch is a ribozyme. B. The structure of the riboswitch is the same, whether bound by ligand or not. C. The riboswitch lowers the rate of translation when bound to its metabolite ligand.

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Which evolutionary process relies on the premise that individuals with the best adaptations are most successful at reproducing and leave more offspring than those with less adaptive forms?

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You have inoculated and incubated a Kligler’s iron agar with a gram-negative rod. Following 24 hours of incubation, there is evidence of good growth on the slant, the slant is red, and the butt is unchanged (orange-red). Which of the following represent(s) the best interpretation of these results?

a. glucose was fermented b. glucose was not fermented c. lactose was not fermented d. lactose was fermented e. peptones were metabolized aerobically f. peptones were metabolized anaerobically g. H2S was produced h. H2S was not produced

Biology & Microbiology