Cell Membrane Transport Quiz
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Questions and Answers

Which of the following is NOT a function of the cell membrane?

  • Separating activities of the cell into different areas (correct)
  • Receiving and responding to extracellular signals
  • Regulating what enters and leaves the cell
  • Defining the boundary of a cell

    • What is the principal function of the 'lipid bilayer' in the biological membrane?

  • To mediate direct interactions with other cells
  • To control the movement of molecules
  • To form a permeability barrier (correct)
  • To confine particular molecules to particular places

    • Which of the following is NOT a membrane-bound organelle?

  • Nucleus
  • Golgi apparatus
  • Mitochondrion
  • Lysosome (correct)

    • Which type of inhibition does not change the affinity of the enzyme for the substrate?

    <p>Non-competitive inhibition</p> Signup and view all the answers

    Which type of inhibition reduces the maximum velocity (Vmax) of the enzyme reaction?

    <p>Non-competitive inhibition</p> Signup and view all the answers

    Which type of inhibition follows Michaelis-Menten kinetics?

    <p>Competitive inhibition</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the phospholipid bilayer?

    <p>It allows hydrophilic molecules to pass through spontaneously</p> Signup and view all the answers

    Which of the following is the most hydrophobic component of the membrane?

    <p>Cholesterol</p> Signup and view all the answers

    Which type of membrane protein spans the entire membrane?

    <p>Transmembrane proteins</p> Signup and view all the answers

    What is the function of peripheral membrane proteins?

    <p>Attachment to cytoskeleton</p> Signup and view all the answers

    Which of the following is NOT a requirement for transport across the membrane?

    <p>Diffusion</p> Signup and view all the answers

    Which of the following is an example of primary active transport?

    <p>Na+/K+ pump</p> Signup and view all the answers

    What is the Michaelis constant (Km) in enzyme kinetics?

    <p>The substrate concentration at ½ Vmax</p> Signup and view all the answers

    What type of inhibition occurs when an inhibitor binds to the same site as the substrate and competes for access?

    <p>Competitive inhibition</p> Signup and view all the answers

    Which of the following routes of administration is best for larger volumes and when faster absorption is desired?

    <p>Intravenous</p> Signup and view all the answers

    Which of the following factors can affect the rate of drug absorption from the gut?

    <p>All of the above</p> Signup and view all the answers

    Which of the following routes of administration avoids first-pass metabolism?

    <p>Intravenous</p> Signup and view all the answers

    Which of the following is NOT a characteristic of oral administration?

    <p>Avoids first-pass metabolism</p> Signup and view all the answers

    Which of the following is NOT one of the four key processes involved in pharmacokinetics?

    <p>Excretion</p> Signup and view all the answers

    What is the term used to define the transfer of a drug from the site of administration to the general circulation?

    <p>Absorption</p> Signup and view all the answers

    Which of the following is NOT a route of drug administration?

    <p>Excretion</p> Signup and view all the answers

    What is the term used to describe the irreversible loss of unchanged drug from the body?

    <p>Excretion</p> Signup and view all the answers

    Which route of administration is most suitable for lipid-soluble drugs and expensive bronchodilators?

    <p>Inhalation</p> Signup and view all the answers

    Which of the following is NOT an advantage of various routes of administration?

    <p>Avoids first pass metabolism</p> Signup and view all the answers

    What determines the route of administration?

    <p>All of the above</p> Signup and view all the answers

    What is bioavailability?

    <p>The fraction of the administered dose that reaches the systemic circulation as intact drug</p> Signup and view all the answers

    Which of the following is NOT a major step of information processing in biology from storage in the form of DNA through to generation of pure protein?

    <p>Mutation</p> Signup and view all the answers

    Which of the following is NOT a type of bond that holds DNA together?

    <p>Peptide bond</p> Signup and view all the answers

    Which of the following is NOT a fundamental element of chromosomes in the human genome?

    <p>Exons</p> Signup and view all the answers

    Which of the following modifications promotes relaxation of chromatin structure?

    <p>Acetylation of specific histone residues</p> Signup and view all the answers

    Which of the following regions of DNA is always in the heterochromatin form?

    <p>Centromeres</p> Signup and view all the answers

    What is the role of Histone Deacetylases (HDACs) in gene expression?

    <p>They promote DNA condensation</p> Signup and view all the answers

    Which of the following statements about DNA is correct?

    <p>The sugar-phosphate backbone is on the exterior and the purine and pyrimidine bases are on the interior</p> Signup and view all the answers

    Which of the following is NOT a force holding DNA together?

    <p>Base stacking</p> Signup and view all the answers

    Which of the following is the most basic repeating structural unit of chromatin?

    <p>Nucleosome</p> Signup and view all the answers

    Which of the following is NOT a type of chromatin?

    <p>Solenoid</p> Signup and view all the answers

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