The most dangerous arrhythmia is
a. ventricular tachycardia.
b. ventricular bradycardia.
c. ventricular flutter.
d. atrial fibrillation.
e. ventricular fibrillation.
E
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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.
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
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
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