Compared to the air a person inhales, the air that they exhale has

A. higher concentrations of both O2 and CO2 .
B. a lower concentration of O2 and a higher concentration of CO2 .
C. a higher concentration of O2 and a lower concentration of CO2 .
D. lower concentrations of both O2 and CO2 .
E. equal amounts of O2 and CO2.


B. a lower concentration of O2 and a higher concentration of CO2 .

Biology & Microbiology

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The ___ Echinoderm lineage is composed of sea stars, each with a central disk surrounded by 5 to 20 "arms."

a. Echinoidea b. Ophiuroidea c. Crinoidea d. Holothuroidea e. Asteroidea

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You have made a specific DNA probe that will bind to a key sequence on the DNA of Neisseria gonorrhoeae, allowing your company to market a gonorrhea test kit that can be used to identify the bacterium in genital tract specimens. However, upon testing it out against a known Neisseria gonorrhoeae culture, you find that it does not work.  Which of the following is a possible explanation for this negative result?

A. You forgot to incubate the test at the 75°C temperature required for hybridization. B. You forgot to add the mRNA to the DNA probe sample. C. You forgot to label the probe sequence with a reporter molecule. D. You forgot to digest the probe with restriction endonucleases.

Biology & Microbiology

Which of the following can pass through gap junctions?

a. cAMP and calcium ions b. Insulin and calcium ions c. cAMP and glucose d. Insulin and glucose

Biology & Microbiology