One of the most common etiologic agents of lower respiratory tract infection among previously healthy patients 2 months to 5 years of age is:
a. C. pneumoniae.
b. M. pneumoniae.
c. S. pneumoniae.
d. respiratory syncytial virus.
D
Community-acquired pneumonia is a common and potentially serious infection that afflicts children. Among previously healthy patients 2 months to 5 years of age, respiratory syncytial virus, human metapneumovirus, parainfluenza, influenza, and adenoviruses are the most common etiologic agents of lower respiratory tract disease.
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a. autotroph b. auxotroph c. heterotroph d. chemotroph e. photoheterotroph
The beating flagellae of ____ maintain a constant flow of water through sponges
a. amoeboid cells b. choanocytes c. sperm d. porocytes e. pinacoderm
Frameshift mutations
A. applies to the reading frame (sequence of codons) being changed. B. most often happen when one or more nucleotides are inserted or deleted from the DNA. C. can result in a completely new codon sequence that results in the production of non-functional proteins. D. All of the choices are correct.
What is the purpose of safranin in the Gram stain technique?
a. It is a counterstain, which will make gram-positive bacteria colorless. b. It is a decolorizing agent. c. It is the primary stain used to impart a pink color to all cells in a heat-fixed smear. d. It is a counterstain, which turns gram-negative bacteria pink.