The eggs of Paragonimus mexicanus measure approximately 80 µm by 40 µm, are unembryo-nated and operculated, and have thick shells that are brownish-yellow. An individual with this infection has most likely traveled to which endemic area?
a. Japan
b. Africa
c. New Guinea
d. South America
D
Paragonimus is found primarily in the Far East (China, Japan, Korea, Manchuria, Papua New Guinea, and Southeast Asia), and certain species such as P. mexicanus are found in areas of Mexico and South America. The eggs of P. westermani measure 80 to 120 µm by 45 to 60 µm, and those of P. mexicanus are approximately 80 µm by 40 µm. The eggs are unembryonated when they leave the body, operculated with opercular shoulders, thick shelled, and brow-nish-yellow.
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Compound A is a ____________________.
Assume that you are taking an organic chemistry class. Your teacher has given you four organic compounds to analyze. She tells you that one is a carbohydrate, one is a hydrocarbon, one is a nucleic acid, and one is a protein. Compound A contains only carbon and hydrogen. Of the four types of compounds which were given to you to analyze, which one best describes Compound A?
Which etiologic agent is associated with an infection resulting in a copious frothy fishy-smelling vaginal discharge?
A. Neisseria gonorrhoeae B. Gardnerella vaginalis C. Chlamydia trachomatis D. Treponema pallidum
During the elongation stage of transcription ____
a. DNA nucleotides are added to the transcript b. the transcript grows in the 5'®3' direction c. transcription factors recruit RNA polymerase to the template strand
d. the double helix remains single-stranded after being used as a template e. RNA polymerase binds to the promoter region