The transport of molecules out of the urinary filtrate and into the blood is called ________.
Fill in the blank(s) with the appropriate word(s).
reabsorption
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Ambient air, which contains 21% oxygen (O2) and a small amount (0.03%) of carbon dioxide (CO2), is the environmental condition that best suits which type of organism?
a. Aerobes b. Anaerobes c. Capnophiles d. Microaerophiles
A 4-year-old boy attended day care 3 days per week. He was irritable, and his parents noticed that he had persistent perianal itching. A sticky paddle was pressed against the perianal region and sent to the laboratory for testing. The eggs microscopically observed would most likely have which one of the following morphologic features?
a. Long with a short buccal cavity b. Thin shell with internal granules c. Bipolar plugs d. Flat-sided, football-shaped
When a DNA promoter sequence is methylated, ____
a. it is permanently silenced because the methyl group can never be removed b. it is temporarily silenced because the methyl group can be removed c. it is perpetually transcribed because the methyl group can never be removed d. it is temporarily transcribed because the methyl group can be removed e. the impact on expression depends on the gene being controlled by the promoter
How does the presence of allolactose affect the lactose operon? a. Allolactose binds to the repressor, altering its shape so it cannot bind to operators
b. Allolactose binds to the operators so the repressor cannot bind there. c. Allolactose binds to the promoter so RNA polymerase may not bind there. d. Allolactose has a homeodomain that binds to specific base sequences in the first gene, blocking transcription.