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 .
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Infectious processes that quickly develop are referred to as _________ infections
a. chronic b. latent c. acute d. nosocomial
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
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.
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