The shape of the virus is determined by its
A. nucleic acid.
B. capsid.
C. envelope.
D. tail.
B
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The ________ is the point at which a lens focuses parallel beams of light.
Fill in the blank(s) with the appropriate word(s).
The countercurrent exchange system found in fish gills maximizes gas exchange efficiency by:
a. producing rapid water flows across the gill surface. b. allowing water and blood to come in direct contact to maximize oxygen exchange. c. having a high concentration gradient of oxygen at the start of the capillaries. d. maintaining a high concentration gradient of oxygen along the entire length of capillaries. e. decreasing the oxygen content of the blood leaving the gill filaments
You and your neighbor each have a holly bush in your yards. You carefully water and care for your bush, but it fails to produce berries. Your neighbor, on the other hand, neglects his holly, yet it produces gorgeous red berries each year. Finally, in frustration, you replace your holly with a rose bush. The next year, your neighbor's holly bush has no berries at all. What happened?
A. Holly plants are dioecious. Yours was a male that was needed to pollinate the neighbor's female. B. The neighbor's bush became infected with the same disease that yours had. C. Roses secrete a chemical that inhibits the reproduction of neighboring plants. D. Roses compete for the same insect pollinators as holly bushes.
The presence of active motile multi-flagellated trophozoites in vaginal or urethral secretion is indicative of infection with
A. Trichomonas vaginalis. B. Chlamydia trachomatis. C. Giardia intestinalis. D. Acanthamoeba. E. Balantidium coli.