1. What is the role of arrestin in the process of hormone signaling? a. arrestin is activated by a hormone binding at the cell surface and acts to dephosphorylate a wide variety of enzymes such as glycogen phosphorylase kinase b. arrestin is functional in cytoplasmic chaperonins c. arrestin recognizes phosphorylated domains of constitutively activated receptors and promotes the receptor being endocytized d. arrestin is a chaperone that operates in the Golgi to properly fold glycosylated proteins 2. Cytochromes are proteins using _?_ as prosthetic groups. a. flavin b. copper atom c. Zn d. heme e. iron-sulfur 3. Where are H+ ions concentrated during electron movement through the ETC? a. intermembrane space b. matrix c. peroxisome d. cytoplasm e. sER 4. What is the cellular function of the GLUT-1 protein? a. it is a glucose lyase b. participates in muscle contraction c. acts as a kinase in the MAPK pathway d. it is a glucose permease e. it participates in removal of ROSs in the mitochondria 5. Do mitochondria have ribosomes? a. yes b. no c. only the mitochondria found in muscles cells have ribosomes 6. Which of the following tissue types responds to a hormonal signal triggered by high glucose levels by placing additional GLUT1/4 into the cell membrane? Mark all that apply. a. fat cells b. liver c. brain d. muscle e. kidney 7. Which of the following is used to both generate heat without appreciable ATP production and as a method of preventing ROS production in the mitochondria? a. oxaloacetate b. GPX c. uncoupling proteins d. MnSOD e. physostigmine 8. The human disease Cystinuria is caused by a malfunctioning... a. glucose transporter b. amino acid transporter c. cell membrane receptor d. H+ pump e. cytochrome c 9. What is the allosteric activator of PKA? a. NAD+ b. Ca2+ c. heme d. cAMP e. ADP 10. What is the benefit of phosphorylating glucose as it is brought into the cell? a. to prevent it being degraded in the cytosol b. to keep the gradient large inside the cell, thus promoting passive diffusion of glucose out of the cell c. to prevent cytoplasmic glucose from interfering with the gradients needed to import glucose d. to aid in bringing in more Na+ 11. What is a zymogen? a. a transport protein specific for Ca2+ ions b. an enzyme that requires cAMP as an allosteric activator c. a protein that operates in structures called chaperonins d. a transport protein that operates via indirect active transport e. an enzyme that must undergo proteolytic cleave to be activated
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Which of the following types responds to hormonal signals triggered by high glucose levels, placing GLUT4 into the cell membrane? **Answer: Muscle and adipose cells** Show more…
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