Probiotics are foods, like yogurt, or dietary supplements that contain living bacteria. Why would someone want to knowingly consume bacteria?
A. to populate their gut with "good" bacteria
B. to reduce the ability of pathogens to
populate the gut
C. to reduce or eliminate gastrointestinal
problems
D. All of the answer options are correct.
D
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A simplified form of the Fick diffusion equation is J = KA (C1-C2) where J is the rate of diffusion, K is a constant, A is the area across which diffusion is occurring, and C1 and C2 are the concentrations of the substance on either side of the membrane. Given this, which of the following would INCREASE the rate of diffusion of a solute?
A. An increase in C1 while holding C2 constant B. An equivalent decrease in both C1 and C2 C. An equivalent increase in both C1 and C2 D. A decrease in D E. A decrease in A
If an enzyme's optimal temperature is 37?C, you also know that
a. the enzyme has a cofactor. b. the enzyme is likely to be active at 30?C and at the same reaction rate. c. the enzyme will probably be inactive at a pH below 4.5. d. the enzyme will completely denature at 38?C. e. the enzyme's activity will drop at temperatures above 37?C and likely be eliminated by 60?C.
The white matter differs from gray matter in
that
a. white matter is found in the brain, and gray matter is found in the spinal cord. b. white matter consists of bundles of myelinsheathed axons, and gray matter consists of cell bodies, dendrites, and neuroglial cell. c. white matter transmits sensory information, and gray matter transmits motor information. d. white matter is associated with the sympathetic nervous system, and gray matter is associated with the parasympathetic nervous system. e. all of these are true.
Which organisms stain as either Gram-positive or Gram-negative?
a. Bacteria b. Mercaria c. Archaea d. Eukarya