Which one of the following statements is TRUE? Question 3Select one:a.The toxic plant atropa belladonna is an acetylcholine receptor agonist that prevents muscle contraction and can cause paralysis.b.Constitutive activity of a receptor refers to the ability of a hormone to change the DNA in the cell – ie the constitution of the cell.c.A hormone that acts as a partial agonist at a receptor completely blocks cell signal transduction to prevent an effect on the cell.d.The faster the metabolic clearance rate of a substance, the shorter its half-life.e.Dopamine, epinephrine and norepinephrine are steroid hormones.
Question
Which one of the following statements is TRUE? Question 3Select one:a.The toxic plant atropa belladonna is an acetylcholine receptor agonist that prevents muscle contraction and can cause paralysis.b.Constitutive activity of a receptor refers to the ability of a hormone to change the DNA in the cell – ie the constitution of the cell.c.A hormone that acts as a partial agonist at a receptor completely blocks cell signal transduction to prevent an effect on the cell.d.The faster the metabolic clearance rate of a substance, the shorter its half-life.e.Dopamine, epinephrine and norepinephrine are steroid hormones.
Solution
The correct statement is: d. The faster the metabolic clearance rate of a substance, the shorter its half-life.
Here's why:
a. Atropa belladonna is an acetylcholine receptor antagonist, not an agonist. It blocks the action of acetylcholine at its receptor, which can lead to paralysis.
b. Constitutive activity of a receptor refers to the activity of a receptor in the absence of a ligand. It does not refer to the ability of a hormone to change the DNA in the cell.
c. A partial agonist does not completely block cell signal transduction. It produces a response, but not to the same extent as a full agonist.
d. The metabolic clearance rate refers to the body's ability to remove a substance. If a substance is cleared quickly, it will have a shorter half-life, which is the time it takes for the concentration of the substance to decrease by half.
e. Dopamine, epinephrine, and norepinephrine are catecholamines, not steroid hormones.
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