The most dangerous arrhythmia is

a. ventricular tachycardia.
b. ventricular bradycardia.
c. ventricular flutter.
d. atrial fibrillation.
e. ventricular fibrillation.


E

Biology & Microbiology

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Atmospheric nitrogen is

A. used directly by plants. B. used directly by animals. C. turned into ammonia by microorganisms. D. directly used to make carbohydrates

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What marks the 5? end of an ORF in a DNA sequence?

a. the stop codon TAG b. the stop codon TAA c. the start codon AUG d. the start codon ATG e. the promoter region containing a consensus sequence

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Which of the following air-filled respiratory system structures are common in insects?

a. gills b. tracheal tubes c. lungs d. integumentary surfaces e. air sacs

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Cellular division within the eukaryotic cells requires DNA to condense into the:

A. 30-nm chromatin fiber. B. 1400-nm chromatin fiber. C. 300-nm chromatin fiber. D. 2-nm chromatin fiber. E. 44-nm chromatin fiber.

Biology & Microbiology