Streptococcal pharyngitis involves all the following, except:
A. a purulent exudate over the tonsils.
B. can lead to scarlet fever if it is an erythrogenic toxin-producing strain.
C. can lead to serious sequelae.
D. is usually caused by the viridans streptococci.
E. causes redness, difficulty in swallowing, and fever.
Ans: D. is usually caused by the viridans streptococci.
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The portion of the flower containing pollen grains is
(a) the pollen sac. (b) the microsporangium. (c) the anther. (d) all of the above.
The primary reason why certain trees tend to grow straight and tall with few lateral branches when compared with other trees is because:
A. of unknown reasons B. Lateral buds are missing in many of these trees C. Lateral bud development is dependent on temperature D. Gibberellins affect the buds detrimentally E. Auxins inhibit lateral bud development
All Echinodermata are found:a
in marine habitats. b. in freshwater. c. on land. d. on the bottom of the ocean or lakes. e. in shallow ocean waters.
What is the function of the Casparian strip in the root?
A. It protects the surface of the root but allows water to be absorbed. B. It allows for horizontal transport of water and nutrients. C. It is the portion of the root that contains numerous root hairs. D. It is an internal water-proofed layer that prevents water and minerals from moving through intercellular spaces on their way to the vascular tissue. E. It seals the surface of roots that have been damaged.