A certain protein receptor is capable of binding the neurotransmitter epinephrine but does not bind to the neurotransmitters dopamine, glutamate, or serotonin. This is because the receptor displays what characteristic?
A. saturation
B. inhibition
C. specificity
D. acclimatization
E. accommodation
C
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Answer the following statement(s) true (T) or false (F)
1. A tissue containing cells capable of changing membrane potential is an excitable tissue. 2. The serous membrane lining the circulatory system is a mesothelium. 3. In an epithelium, there is almost no extracellular matrix. 4. Fibrocartilage is found in intervertebral discs. 5. Blood consists of cells and a ground substance made of formed elements.
________ is/are a genetic disorder.
A. Kidney stones B. Polycystic kidney disease C. Ischemic nephropathy D. Diabetic nephropathy
Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?
A) Second messengers act through receptors called K-proteins. B) Second messengers usually inactivate protein kinase enzymes. C) Cyclic AMP and calcium may be second messengers. D) Second messengers usually act to remove nitric oxide (NO) from the cell.
In a 10-percent aqueous solution of some salt, the salt is the solute and occupies 10 percent of the solution volume; the solvent—water—makes up the remaining ________ percent of the solution volume
A) 10 B) 50 C) 90 D) 95