Drug Action Exam 1 Practice Test

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• Which step describes the alpha subunit dissociating from the beta-gamma to activate the effector?
• What is a drug product?
• EC50 represents the concentration of a drug that produces what percent of the maximal effect?
• What does a drug product contain?
• Desensitization is defined as which of the following descriptions?
• Which field studies Absorption, Distribution, Metabolism, and Excretion as the journey a drug travels through the body?
• LD50 is defined as which of the following?
• How do drug effects arise?
• Higher Kd and lower Ka values correlate with what?
• What is a non-real receptor?
• Which statement best describes compliance in pharmacotherapy?
• Which event marks the end of the G-protein cycle and allows reassembly of the heterotrimer?
• Therapeutic index is defined as the ratio of the dose to produce toxic/lethal effects to the dose to produce a therapeutic effect.
• In comparing multiple dose-response curves, which curve corresponds to the most potent drug?
• If both a partial agonist and a full agonist are present and the partial agonist concentration is high, what is the expected maximal response compared with full agonist alone?
• What is Kd primarily used for in pharmacology?
• Drug action is affected by which factors?
• Which statement about drug-receptor interactions is most accurate?
• Bioavailability is defined as which of the following?
• A receptor that is widely distributed across many tissues tends to produce which type of effect when activated?
• Which statement about GPCRs is true?
• Which statement best describes a high TI?
• Desensitization is reversible after the removal of the stimulating drug. Which statement is true?
• Which statement best describes low-binding affinity?
• What are the two primary functions of receptors?
• Desensitization in receptor signaling results in
• Real receptors are receptors for what type of ligands?
• In GPCR signaling, which step occurs immediately after a ligand binds to the receptor?
• Kd is the dissociation constant that reflects
• Side effects are defined as what?
• On a receptor binding curve, what does Bmax represent?
• Which is an example of an enzyme-linked receptor?
• Which statement best describes an irreversible antagonist?
• Which term describes the removal and storage of receptors away from the cell surface, reducing receptor availability?
• What is the effect of adding a competitive antagonist on the dose–response curve of the agonist?
• To interact with intracellular receptors, ligands must be what?
• What initiates the G-protein cycle?
• What is pharmacology?
• Which statement is not true about an irreversible antagonist?
• Why must ligands for intracellular receptors be lipid soluble?
• A reversible drug-receptor interaction is characterized by what?
• Which type of ion channel is activated by changes in the transmembrane voltage gradient?
• What are the two types of desensitization?
• If a drug has high binding affinity, which statement is true?
• Which statement describes the relationship between binding affinity and receptor occupancy at a given concentration?
• Which organs are primarily involved in drug excretion?
• Where can the enzymatic domain of enzyme-linked receptors be located?
• Which term refers to the finished dosage form?
• What are the different types of undesirable effects?
• An irreversible antagonist is defined as a drug that binds to the same receptor site as the agonist in an irreversible fashion.
• Which statement correctly describes intracellular receptors?
• Which term describes compounds that can activate a receptor but are unable to elicit a maximal response?
• Which statement about receptor-ligand binding forces is true?
• What must antagonists have regarding their action?
• Which statement best describes the molecular level of drug action?
• Duration of action is best described as which?
• Pharmacodynamics describes what?
• In which direction does the activation of a receptor by its ligand propagate a signal?
• What is important to remember about measuring drug bioavailability?
• Which statement best distinguishes an inverse agonist from a competitive antagonist?
• Tachyphylaxis is defined as which of the following?
• A larger TI value is associated with which of the following?
• Enzyme-linked receptors are characterized by what?
• Among dose-response curves, the one with the greatest maximal effect indicates higher:
• What does it imply if a receptor is an integral component of the cell membrane?
• Which statement correctly characterizes a noncompetitive antagonist?
• Which models describe theories of drug-receptor interaction?
• Which term describes the maximum achievable effect of a drug, regardless of dose?
• How are pharmacodynamic effects typically described?
• In the lock and key model, the active site is described as a keyhole that requires what characteristics?
• Synergism is defined as
• Which statement about drug nomenclature is true?
• In a leftward shift of a dose-response curve, what happens to potency?
• What types of drug responses are described?
• What best describes GPCR structure?
• Which of the following is an example of a physiological antagonist?
• Which of the following is a valid drug classification?
• Which term describes a compound that can activate a receptor but is unable to elicit the full maximal response?
• Up-regulation refers to which of the following in receptor biology?
• In the lock and key model, the active site is like a keyhole; what must the drug possess?
• Which model posits that both the drug and receptor may change shape for an ideal fit?
• What describes the receptor's role in pharmacodynamics?
• Binding affinity is best described as what?
• Which statement best distinguishes potency from efficacy?
• What is a chemical antagonist?
• Which statement best describes an inverse agonist?
• What happens when the concentration of a partial agonist increases relative to a full agonist in terms of binding?
• A larger TI value correlates with which of the following?
• Which statement best summarizes the GPCR signaling pathway?
• Which statement best describes ion channels?
• Which of the following lists are examples of real receptors?
• What is important to remember about the role of receptors?
• A receptor is defined as
• Regulatory molecules that have receptors include which of the following groups?
• What is the effect of albumin's tight binding with many drugs on the drug's availability for diffusion into its target organ?
• The association constant Ka describes how much drug-receptor complexes are being formed.
• Which processes do receptors use to transmit information?
• Which of the following is not an example of a GPCR?
• A hallmark of a quantal dose-response curve is that it shows:
• What describes an agonist?
• In a drug product, what are excipients?
• How does increasing the concentration of a partial agonist affect the response produced by a full agonist?
• Which description correctly identifies the system level of drug action?
• Which statement accurately reflects the relationship between TI and safety in general?
• Which are examples of drug targets?
• The dose-response curve typically plots which relationship?
• Which of the following is an example of drug classification?
• Irreversible antagonists tend to decrease the maximal response because they reduce the number of available receptors.
• Receptor reserve, also known as spare receptors, means
• Which statement best summarizes the overall effect of drugs?
• Which option defines an antagonist?
• Which term best describes a ligand produced outside the body but that binds to a receptor?
• Which term is NOT an example of drug nomenclature?
• Which term describes the process by which a receptor becomes less responsive after repeated stimulation?
• An irreversible drug-receptor interaction is characterized by what?
• Which statement about receptors is true?
• Which statement about drug-receptor interactions is most accurate?
• Which statement correctly describes the mechanism of a chemical antagonist?
• Which statement is true about Ka and Kd?
• Intrinsic Activity is defined as?
• What is the biggest difference between graded and quantal dose-response curves?
• Endogenous ligand is defined as what?
• In GPCRs, the extracellular domain is typically involved in what function?
• Real receptors are examples of which categories?
• Additivity is defined as
• What best describes the role of medicinal chemistry in drug discovery?
• Toxicology is the study of what?
• A drug that binds with high affinity but does not trigger full system activation is best described as which?
• Which term describes the delivery of a drug to the site of action by the bloodstream or lymphatic system?
• If TI equals 10, what is the relationship between TD50 and ED50?
• Which protein is important for plasma-protein binding?
• On a hyperbolic binding curve, Kd is defined as
• What is a drug substance?
• Which type of ion channel is activated by ligand binding to the channel?
• Which forces are involved in drug-receptor binding?
• Which statement best defines excretion?
• Common divisions of pharmacology include ...
• Most drugs are chemicals but not all chemicals are drugs. Which statement reflects this relationship?
• Which term describes the degree to which a drug binds to a receptor compared with other receptors?
• If a ligand is lipid-soluble, where is the receptor most likely located?
• How can the effect of a competitive antagonist be reversed?
• What is the basic function of real receptors?
• What is a pharmacophore?
• TI larger value indicates what about safety margins?
• Pharmacodynamics primarily focuses on what?
• ED50/EC50 describe what pharmacodynamic measure?
• What Purposes do changes from drug substances serve?
• Which statement about voltage-gated ion channels is true?
• Agonists are drugs that
• The sigmoidal binding curve used to describe drug-receptor interactions plots drug bound against what?
• What kinds of effects can be produced by drug action?
• The site of drug action is determined by
• In pharmacokinetics, what is essential for a drug to move from its site of administration to the bloodstream?
• Which of the following is an example of a drug action that does not involve receptors?
• What term describes the receptor's recognition and binding to ligands?
• Pharmacogenetics studies how genetic makeup variations correlate with responses to a specific medication.
• Desensitization can involve the production of intracellular messengers that inhibit receptor signaling. Which of the following exemplifies this mechanism?
• Down-regulation refers to which of the following changes in receptor numbers?
• LD50 represents which concept?
• Which statement best defines distribution in pharmacokinetics?
• What describes an antagonist?
• What is a drug response?
• What is an important characteristic of partial agonists?
• Which statement best describes the induced fit model?
• What is an example of a chemical antagonist?
• Which of the following is a mechanism of desensitization?
• Which option is a mechanism of desensitization?
• On a binding curve, what is typically graphed on the x-axis?
• Up-regulation increases receptor numbers while down-regulation decreases them. Which statement correctly contrasts these processes?
• Which of the following is NOT a molecular feature that influences receptor binding?
• Which term best describes the two essential stages of receptor signaling after ligand binding?
• What are the two types of desensitization?
• Two general divisions of drugs are
• What are the two main types of dose-response relationships?
• What does gating describe in relation to ion channels?
• How do enzyme-linked receptors modify proteins?
• Which statement best describes the cellular level of drug action?
• Which statement about albumin is true?
• ED50 and EC50 refer to the dose or concentration required to produce what percentage of the maximum response?
• What occurs when a receptor activates a G-protein?
• Which are examples of intracellular receptors?
• Onset of action refers to which of the following?
• Which statement about selectivity and side effects is true?
• What are the different levels of drug action?
• What term refers to the biochemical or physiological event after drug binding?
• In relation to receptor affinity, which statement is true about Ka values?
• Which statement best describes high-binding affinity?
• If a substance has a lower LD50, what does this generally indicate?
• What does every step of a drug's journey through the body involve?
• Exogenous ligand is defined as what?
• Compliance is defined as taking a drug according to the prescribed dosage regimen; essential for the successful treatment of disease.
• If two drugs have the same EC50 but different Emax, which has greater efficacy?
• What is the importance of medicinal chemistry?
• Tight albumin binding reduces diffusion to the target organ. What is the consequence?
• The most important class of receptors is formed by
• Which of the following is commonly considered a division of pharmacology?
• Ion channels typically respond on what timescale?
• EC50 is the concentration that produces what fraction of maximal effect?
• LD50 best describes which of the following?
• Which term describes the tissue level?
• Which are the major G-protein families?
• How does the addition of a noncompetitive agonist influence the dose–response curve?
• Which of the following correctly describes intracellular receptor characteristics?
• Can a high concentration of agonist overcome the effect of a noncompetitive antagonist?
• Emax represents which aspect of drug effect?
• Pharmacokinetics describes what?
• Why is the principle of receptor reserve important in interpreting dose-response relationships?
• What determines whether a drug will bind to a receptor among many binding sites in a cell?
• Which sequence correctly describes the steps of the G-protein regulatory cycle?
• In the resting state, which describes the G-protein?
• Which statement describes the system level of drug action?
• Examples of actions not mediated by receptors include
• What is a physiological antagonist?
• A noncompetitive agonist exerts its action by which mechanism?
• Conformational or shape changes in the receptor that reduce its activity are considered a mechanism of desensitization. Which option best represents this?
• Potency is defined as what?
• LD50 is best described as the dose lethal to 50% of subjects.
• Which ion-channel class is regulated by second messengers such as cAMP or Ca2+?
• The G-protein is a heterotrimer composed of which subunits?
• Which term describes side-effects that are not the intended therapeutic effect but are not toxic?
• What effect does the addition of an irreversible antagonist have on a dose-response curve?
• Drugs exert effects by
• Which statement correctly describes transmembrane receptors?
• LD50 refers to the dose lethal to what proportion of test units?
• Which of the following is an example of an exogenous ligand?
• Which statement about the speed of GPCR signaling is correct?
• What does binding affinity determine?
• What happens to the beta-gamma subunit after receptor activation?
• What is the role of receptor in drug action?
• Quantal dose-response curve plots what?
• What term describes the receptor's propagation of its regulatory signal into the target cell?
• Tolerance is defined as which of the following?
• Which term describes the measure of how strongly a drug binds to its receptor?
• What is drug bioavailability?
• Selectivity is defined as
• A drug that irreversibly binds to an allosteric site is best described as which?
• Which statement best defines absorption in pharmacokinetics?
• Which example illustrates the integrative effect of receptors?
• Lower Kd and higher Ka values correlate with what in receptor binding?
• What is the correct expression for TI?
• Which statement best defines metabolism in pharmacokinetics?
• Which statement best describes the tissue level of drug action?
• In heterologous desensitization, activating receptor A desensizes which receptor?
• How does increasing selectivity affect side effects?
• GPCRs are best described as which of the following?
• What best defines a receptor?
• Which mechanisms are involved in desensitization?
• Which term describes compounds that elicit a maximal response following receptor occupation and activation?
• Which statement describes the pathway of drug action?
• What is the effect of a noncompetitive antagonist on the dose–response curve?
• Which of the following best describes a competitive antagonist?
• In homologous desensitization, what happens when an agonist activates receptor A?
• Antagonists are drugs that
• Intrinsic activity describes
• Which statement best describes receptor reserve?
• What are the four common types of receptors?
• Which organ is primarily involved in enzymatic drug degradation?
• Drug targets that fit the receptor-ligand model include
• Which term describes the maximal efficacy of a drug?
• What are the two drug-body interactions?
• Which statement best defines pharmacokinetics?
• Which receptor type is typically activated by peptide ligands and signals via G proteins?
• Which statement best describes the effect of a noncompetitive agonist on receptor activation?
• In a receptor binding study, what does B represent?
• What must agonists have regarding their action?
• What is the purpose of receptor isoforms?
• Which statement about TI is false?
• Which statement about LD50 is false?
• Which statement best defines an agonist?