Nt1310 Final Exam
Let re-learn some stuff and earn some points back. These are questions missed by most of you on the exam.
You can only earn up to a maximum of 120 points total (your exam 1 score + what you earned here).
One point per correctly answered question (20 points) 1. Oxidative phosphorylation requires all of the items listed below except a. ATP synthase in the correct position in the membrane. b. The flow of electrons from NADH to protein in the membrane. c. A matrix more positively charged than the inter-membrane space. d. A terminal electron acceptor which is oxygen in mitochondria. e. Enzyme complexes embedded in a membrane. 2. Which of the following statement about enzymes is FALSE? a. An enzyme can be used over and over …show more content…
again because it is not changed in the chemical reaction. b. Enzymes are necessary to cause certain reactions to occur in cells that cannot occur in the absence of enzymes. c. An enzyme shows specificity for its substrate(s). d. Once a substrate binds to an enzyme, it can leave the active site on the enzyme unaltered. e. Some enzymes require the presence of trace metals to be active. 3. What is a molecule that is similar in structure to a messenger and binds with that messenger’s receptor to stimulate a response from the target cell called? a. Agonist b. Noncompetitive inhibitor c. Competitive inhibitor d. Antagonist e. Blocker 4. When molecules are passively transported across a membrane, the direction of their movement is dictated by the molecule’s tendency to move ________. a. From lower to higher concentration b. In both directions; there is no preference c. Out of a cell d. Into a cell e. From higher to lower concentration
5. Based solely upon its electrical charge, the inside of a typical cell will tend to attract extracellular ___________ to move inward. a. Cations b. Ions whose concentration gradient allows them c. Anions d. Uncharged ions e. Proteins 6. The _______ is the site of ribosomal RNA production a. Cytosol b. Nucleus c. Nucleolus d. Lysosome e. Mitochondria 7. The _________ is the site where lipids, triglycerides, and steroids are synthesized, as well as where calcium is stored within the cell. a. Rough endoplasmic reticulum b. Nucleolus c. Lysosome d. Mitochondria e. Smooth endoplasmic reticulum 8. Which of the following does NOT directly determine the rate at which an ion will move passively across a membrane? a. Magnitude of driving force b. Permeability of the membrane c. Amount of ATP available d. Membrane surface area e. Concentration gradient 9. Which of the following is NOT a function of cytoskeleton? a. Mechanical support b. Cellular metabolism c. Cellular movement d. Suspension of organelles e. Contraction
10. Which of the following statements about glucose transport (symport) with sodium is true? a. Glucose moves out of the cell while sodium moves into the cell. b. Glucose and sodium both move into the cell. c. Glucose moves into the cell while sodium moves out of the cell. d. Sodium moves out the cell, but the movement of glucose will vary based on the type of cell. 11. Down-regulation may allow a target cell to a. Increase its number of receptors for a ligand. b. Increase its binding affinity for a ligand. c. Decrease its number of receptors for a ligand. d. A and B 12. A membrane permeable to water separates a chamber into two compartments: A and B. Compartment A contains a 10 mM solution of non-penetrating solute, whereas compartment B contains a 40 mM solution of non-penetrating solute. Which of way does water move?
13. Which of the following pairs of characteristics is more likely to make a substance diffuse through the cell membrane? a.
Large, non-polar molecule b. Large amphipathic molecule c. Small, non-polar molecule d. Large, polar molecule e. Small, polar molecule 14. Which of the following statements best describes the function of tyrosine kinase? a. It catalyzes the formation of cAMP. b. It catalyzes the phosphorylation of a protein in the extracellular fluid. c. It catalyzes the phosphorylation of a protein inside the cell. d. It catalyzes the formation of calcium inside cell. e. It sequesters calcium in the cytosol.
15. Which of the following describes the signal transduction mechanism for estrogen, a steroid hormone? a. Activation of enzyme-linked receptor (JAK kinase) b. Activation of cAMP second messenger system c. Opening of fast ligand-gated channels d. Altering transcription of mRNA 16. Lipid-soluble hormones a. Bind to receptors inside the cytoplasm or nucleus. b. Function by activating cAMP c. Bind to receptors on the surface of the cell d. Cannot diffuse through the cell membrane e. Function by way of a second messenger system 17. ATP synthase is able to use the potential energy that originates from ____ to produce ATP. a. Krebs
cycle b. The hydrogen gradient across the inner mitochondrial membrane c. Glycogenesis d. The sodium gradient across the inner mitochondrial membrane 18. An ion widely important in intracellular signaling is a. Potassium b. Chloride c. Calcium d. Cobalt e. Sodium 19. Which of the following is found in DNA and not RNA? a. Thymine only b. Deoxyribose only c. Both adenine and thymine d. Both thymine and deoxyribose e. Adenine only 20. In some cases, signals originating within one cell can diffuse directly to a neighboring cell through ____________. a. Tight junctions b. Desmossomes c. Cadherins d. Gap junctions e. Occludins
You can only earn up to a maximum of 120 points total (your exam 1 score + what you earned here).
One point per correctly answered question (20 points) 1. Oxidative phosphorylation requires all of the items listed below except a. ATP synthase in the correct position in the membrane. b. The flow of electrons from NADH to protein in the membrane. c. A matrix more positively charged than the inter-membrane space. d. A terminal electron acceptor which is oxygen in mitochondria. e. Enzyme complexes embedded in a membrane. 2. Which of the following statement about enzymes is FALSE? a. An enzyme can be used over and over …show more content…
again because it is not changed in the chemical reaction. b. Enzymes are necessary to cause certain reactions to occur in cells that cannot occur in the absence of enzymes. c. An enzyme shows specificity for its substrate(s). d. Once a substrate binds to an enzyme, it can leave the active site on the enzyme unaltered. e. Some enzymes require the presence of trace metals to be active. 3. What is a molecule that is similar in structure to a messenger and binds with that messenger’s receptor to stimulate a response from the target cell called? a. Agonist b. Noncompetitive inhibitor c. Competitive inhibitor d. Antagonist e. Blocker 4. When molecules are passively transported across a membrane, the direction of their movement is dictated by the molecule’s tendency to move ________. a. From lower to higher concentration b. In both directions; there is no preference c. Out of a cell d. Into a cell e. From higher to lower concentration
5. Based solely upon its electrical charge, the inside of a typical cell will tend to attract extracellular ___________ to move inward. a. Cations b. Ions whose concentration gradient allows them c. Anions d. Uncharged ions e. Proteins 6. The _______ is the site of ribosomal RNA production a. Cytosol b. Nucleus c. Nucleolus d. Lysosome e. Mitochondria 7. The _________ is the site where lipids, triglycerides, and steroids are synthesized, as well as where calcium is stored within the cell. a. Rough endoplasmic reticulum b. Nucleolus c. Lysosome d. Mitochondria e. Smooth endoplasmic reticulum 8. Which of the following does NOT directly determine the rate at which an ion will move passively across a membrane? a. Magnitude of driving force b. Permeability of the membrane c. Amount of ATP available d. Membrane surface area e. Concentration gradient 9. Which of the following is NOT a function of cytoskeleton? a. Mechanical support b. Cellular metabolism c. Cellular movement d. Suspension of organelles e. Contraction
10. Which of the following statements about glucose transport (symport) with sodium is true? a. Glucose moves out of the cell while sodium moves into the cell. b. Glucose and sodium both move into the cell. c. Glucose moves into the cell while sodium moves out of the cell. d. Sodium moves out the cell, but the movement of glucose will vary based on the type of cell. 11. Down-regulation may allow a target cell to a. Increase its number of receptors for a ligand. b. Increase its binding affinity for a ligand. c. Decrease its number of receptors for a ligand. d. A and B 12. A membrane permeable to water separates a chamber into two compartments: A and B. Compartment A contains a 10 mM solution of non-penetrating solute, whereas compartment B contains a 40 mM solution of non-penetrating solute. Which of way does water move?
13. Which of the following pairs of characteristics is more likely to make a substance diffuse through the cell membrane? a.
Large, non-polar molecule b. Large amphipathic molecule c. Small, non-polar molecule d. Large, polar molecule e. Small, polar molecule 14. Which of the following statements best describes the function of tyrosine kinase? a. It catalyzes the formation of cAMP. b. It catalyzes the phosphorylation of a protein in the extracellular fluid. c. It catalyzes the phosphorylation of a protein inside the cell. d. It catalyzes the formation of calcium inside cell. e. It sequesters calcium in the cytosol.
15. Which of the following describes the signal transduction mechanism for estrogen, a steroid hormone? a. Activation of enzyme-linked receptor (JAK kinase) b. Activation of cAMP second messenger system c. Opening of fast ligand-gated channels d. Altering transcription of mRNA 16. Lipid-soluble hormones a. Bind to receptors inside the cytoplasm or nucleus. b. Function by activating cAMP c. Bind to receptors on the surface of the cell d. Cannot diffuse through the cell membrane e. Function by way of a second messenger system 17. ATP synthase is able to use the potential energy that originates from ____ to produce ATP. a. Krebs
cycle b. The hydrogen gradient across the inner mitochondrial membrane c. Glycogenesis d. The sodium gradient across the inner mitochondrial membrane 18. An ion widely important in intracellular signaling is a. Potassium b. Chloride c. Calcium d. Cobalt e. Sodium 19. Which of the following is found in DNA and not RNA? a. Thymine only b. Deoxyribose only c. Both adenine and thymine d. Both thymine and deoxyribose e. Adenine only 20. In some cases, signals originating within one cell can diffuse directly to a neighboring cell through ____________. a. Tight junctions b. Desmossomes c. Cadherins d. Gap junctions e. Occludins