The onset of a given epidemic is indicated by a sharp rise in the number of cases reported daily over a brief interval. This indicates that the mode of transmission is
A) host to host.
B) a common source.
C) insect vector.
D) mechanical vector.
Answer: B
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The presence of gram-positive diplococci in a sputum sample most likely indicates an infection of
A) Streptococcus pyogenes. B) Streptococcus pneumoniae. C) Corynebacterium diphtheriae. D) Bordetella pertussis.
Based on their feeding habits, bumblebees are considered __________
a. bulk feeders b. fluid feeders c. filter feeders d. omnivores
After working several hours in a flower shop, you do not detect the smell of the roses. Why?
a. Sensory adaptation has occurred. b. Stimulus transduction has increased. c. Sensory perception has been blocked. d. Sensory summation has occurred. e. The nasal epithelium has become blocked.
Identify four external features of a woody twig and briefly explain the function and/or origin of each. What will be an ideal response?