The most common etiologic agents in acute otitis media in children include:
a. Klebsiella pneumococci.
b. H. influenzae.
c. Streptococcus agalactiae.
d. M. catarrhalis.
B
In children, in whom otitis media is most common, pneumococci (33% of cases) and H. influen-zae (20%) are the usual etiologic agents in acute disease. Group A streptococcus (S. pyogenes) are the third most frequently encountered agents, found in 8% of cases.
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The distinctive feature of chloroplasts is that they contain a green pigment called:
A. Gram stain. B. chlorophyll. C. hemoglobin. D. chromatin. E. keratin.
Which organisms cause "red tides?"
a. bacteria. b. cyanobacteria. c. euglenoids. d. dinoflagellates.
Active transport is different from simple diffusion because active transport
A. requires ATP. B. moves molecules against a concentration gradient. C. requires the use of proteins embedded within the cell membrane. D. moves molecules from an area of lower concentration to an area of higher concentration. E. All answers are correct.
Which of these terms specifically means the intake and expulsion of air using the lungs?
a) inspiration b) aeration c) Ventilation d) Oxygenation