The rate of diffusion of molecules would be fastest in a cell with an
A. internal concentration of 50 percent and an external concentration of 12 percent in warm temperatures.
B. internal concentration of 40 percent and an external concentration of 35 percent in warm temperatures.
C. internal concentration of 45 percent and an external concentration of 50 percent in cold temperatures.
D. internal concentration of 50 percent and an external concentration of 12 percent in cold temperatures.
Answer: A
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Lobsters and clams have _____ in common with fishes
a. external gills b. a two-chambered heart c. internal gills d. skin as a respiratory surface e. an open circulatory system
What cultural trait is unique to hominins? What will be an ideal response?
In humans, the body needs to maintain oxygen levels within narrow homeostatic ranges. If the blood oxygen level drops below that range, the body responds by
A) using positive feedback to further lower the oxygen level. B) using negative feedback loops to return the oxygen level to normal. C) setting this lower oxygen level as the new normal. D) using positive feedback to raise the oxygen level. E) using negative feedback loops to further lower the oxygen level.
In a direct ELISA, the reporter enzyme
A) is bound to the detection antibody and chemically modifies an added substrate to generate a colorimetric or chemiluminescent change. B) reacts directly with the antigen the assay is seeking. C) is bound to the detection antibody. D) chemically modifies an added substrate to generate a colorimetric or chemiluminescent change. E) reacts directly with the antigen the assay is seeking and chemically modifies an added substrate to generate a colorimetric or chemiluminescent change.