Question 1

If a 10 mg morphine produces a greater analgesic response than can achieved by ibuprofen at any dose , which of the following statements is correct ?

Accepted Answer

Morphine is a full agonist, meaning that it produces a maximal response at any dose. Ibuprofen is a partial agonist, meaning that it produces a submaximal response at any dose. Therefore, morphine is a better drug to take for pain relief than is ibuprofen.

Question 2

In the presence of naloxone , a higher concentration of morphine is required to elicit full pain relief . Naloxone by it self has no effect . Which of the following is correct regarding these medications ?

Accepted Answer

Naloxone is a competitive antagonist, meaning it competes with morphine for the same receptor sites, requiring a higher concentration of morphine to achieve the same effect.

Question 3

In the presence of pentazocine , a higher concentration of morphine is required to elicit pain relief . Pentazocine by it self has a smaller analgesic effect than does morphine , even at the highest dose , Which of the following is correct regarding these medications ?

Accepted Answer

Morphine is a full agonist, and pentazocine is a partial agonist.

Question 4

In the presence of picrotoxin , diazepam is less efficacious at causing sedation , regardless of the dose . Picrotoxin by it self has no sedative effect even at the highest dose . Which of the following is correct ?

Accepted Answer

Picrotoxin is a noncompetitive antagonist because it reduces the efficacy of diazepam without having any sedative effect on its own, indicating it does not compete with diazepam at the same binding site.

Question 5

Which of the following would up regulate postsynaptic beta 1 adrenergic receptors?
Daily use of amphetamine that causes norepinephrine to be released .

Accepted Answer

The answer of Which of the following would up regulate...

Question 6

Which one of the following is a fundamental difference between competitive and noncompetitive antagonist ?

Accepted Answer

Competitive antagonists increase the EC50 of an agonist, indicating reduced potency, while noncompetitive antagonists decrease the Emax, indicating reduced efficacy.

Question 7

Which of the following regarding E max is correct ?

Accepted Answer

E max refers to the maximum effect achievable with a drug, assuming all receptors are occupied, and no further increase in response is observed with higher drug concentrations.

Question 8

Candesartan and irbesartan are angiotensin receptor blockers that are used to treat hypertension . The therapeutic dose range for candesartan is 4 to 32 mg , as compared to 75 to 300 mg for irbesartan . which of the following regarding this statement is correct ?

Accepted Answer

Candesartan is more potent than irbesartan because it achieves therapeutic effects at a lower dose range compared to irbesartan.

Question 9

A characteristic that distinguishes true receptors from other drug binding sites present in blood and other biological tissues is the characteristic of:

Accepted Answer

The answer of A characteristic that distinguishes true receptors from...

Question 10

A drug which does not produce any action by itself but decreases the slope of the log dose-response curve and suppresses the maximal response to another drug is a…

Accepted Answer

A noncompetitive antagonist binds to a site other than the active site on a receptor, reducing the efficacy of the agonist and suppressing the maximal response without affecting the initial slope of the dose-response curve.

Question 11

'Drug efficacy' refers to..

Accepted Answer

Drug efficacy refers to the maximal intensity of response that can be produced by the drug, indicating its ability to achieve the desired therapeutic effect.

Question 12

Competitive antagonists.

Accepted Answer

The answer of Competitive antagonists.
...

Question 13

A non-competitive antagonist :

Accepted Answer

A non-competitive antagonist decreases the maximum response to an agonist by binding to a different site than the agonist, preventing the agonist from eliciting its full effect, regardless of its concentration.

Question 14

The types of antagonism are:

Accepted Answer

Competitive antagonism is a type of antagonism where an antagonist competes with an agonist for binding to the same receptor.

Question 15

The term "chemical antagonism" means that:

Accepted Answer

Chemical antagonism occurs when two drugs interact to form an inactive compound, thereby reducing the effect of one or both drugs.

Question 16

An agonist is substance that:

Accepted Answer

An agonist is a substance that interacts with a receptor and initiates changes in cell function, producing various effects.

Question 17

If an agonist can produce maximal effects and has high efficacy it's called:

Accepted Answer

A full agonist is a compound that can produce maximal effects and has high efficacy by fully activating the receptor it binds to.

Question 18

If an agonist can produce submaximal effects and has moderate efficacy it's called:

Accepted Answer

A partial agonist is a drug that binds to a receptor and produces a response but not to the full extent as a full agonist, resulting in submaximal effects.

Question 19

antagonist is a substance that:

Accepted Answer

An antagonist binds to receptors but does not activate them, thus blocking or dampening the action of agonists or endogenous ligands.

Question 20

A competitive antagonist is a substance that:

Accepted Answer

A competitive antagonist binds to the same receptor site as the agonist, preventing the agonist from binding and thereby inhibiting its effect.

Quiz 4: Comprehensive Pharmacology Questions and Case Studies