Bacteriophages are:a
viruses that infect bacteria.
b. plasmids that infect bacteria.
c. bacteria that infect other bacteria.
d. enzymes that destroy bacteria.
e. recombinant organisms.
a
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The ___________ are a group within the Euglenozoa that have a unique, single mitochondrion.
Fill in the blank(s) with the appropriate word(s).
A key role of the atrioventricular node is to
A. act as the pacemaker of the heart, by generating electrical signals in the right atrium. B. slow down the conduction of the electrical impulse as it passes from the atria to the ventricles. C. speed up the conduction of the electrical impulse as it passes from the atria to the ventricles. D. block backflow of blood from the aorta into the right ventricle. E. act as a barrier to prevent the electrical impulse in the atria from reaching the ventricles.
During the third stage of aerobic respiration,
electrons and hydrogen ions released by the reactions of the first two stages are picked up by a. photosynthetic enzymes and ATP. b. CO2 and H2O. c. iron and glucose. d. NAD and FAD e. none of these.
What represents a nonionizing form of radiation, often used for disinfection purposes?
A. UV radiation B. X rays C. Gamma rays D. Cathode rays