Which of the following is NOT an effect of smoking
just a single cigarette?
a. The cilia of cells lining airways accelerate their
removal of airborne pathogens and pollutants.
b. Patrolling white blood cells are killed.
c. Debris begins to clog airways.
d. Biofilms of pathogens begin to build up.
e. Susceptibility to disease is increased.
Answer: a
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Which one of the following statements about the incorporation of selenocysteine into proteins is true?
A. Selenocysteine is an example of a posttranslational modification. B. The tRNA used to translate selenocysteine at a stop codon is first charged with serine. C. The tRNA used to translate selenocysteine at a stop codon has an anticodon sequence of UGA. D. The serine bound to the tRNA used to translate selenocysteine at a stop codon is converted to selenocysteine by the enzyme SelB.
The C4 photosynthetic cycle is more efficient than the C3 cycle when the ________
a. climate is hot and dry b. soil is deficient in nitrogen c. climate is cool and damp d. plant is growing at a high altitude
Both Taenia and Trichinella can be found as cysts embedded in pork muscle. Which of the following statements about these organisms is incorrect?
A. Both helminths can exit the digestive system and migrate to other tissues. B. For both organisms, cyst envelopes are digested in the stomach, releasing the larvae to the intestine. C. Only Taenia can be transmitted from one human to another. D. Both organisms release eggs in the feces to propagate the helminth.
At the start of both experiments, the bacteria were
a. evenly distributed throughout the chamber. b. clustered on the algal filament. c. clumped along certain areas of the algal filament. d. actively avoiding the algal filament.