According to NFPA, rehab should be required after a fire fighter has consumed ____ 30-minute SCBA bottle(s).

a. 4
b. 1
c. 2
d. 3


Ans: c. 2

Biology & Microbiology

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Adaptations for deep diving in cetaceans include all the following except:

a. expelling air from the lungs. b. large lungs with large number of air sacs. c. rib cage that can collapse. d. sonar for detecting the depth. e. high red blood cell count

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During the initiation step of transcription, which molecule binds the promoter region of a DNA molecule?

A) DNA polymerase B) Reverse transcriptase C) RNA polymerase D) DNA primase E) Topoisomerase

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The parabronchi of birds are open at both ends. Indicate whether the statement is true or false

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Cancer cells exhibit changes in morphology consistent with

a) Terminal differentiation b) Trans-differentiation c) Onco-differentiation d) De-differentiation

Biology & Microbiology