Which of the following statements is true regarding glycogen phosphorylase? Glycogen phosphorylase in muscle is allosterically...
- Which of the following statements is true regarding glycogen phosphorylase?
- Glycogen phosphorylase in muscle is allosterically activated by ATP and G6P.
- Glycogen phosphorylase catalyzes the cleavage of both alpha1, 4) and alpha (1,6) bonds.
- Glycogen phosphorylase is activated by both phosphorylase kinase and PKA.
- All of the above are false
Homework Answers
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Which of the following statements is true regarding glycogen
phosphorylase?
Glycogen phosphorylase in muscle is allosterically...
1. Which of the following is true regarding glycogen metabolism? a. Glycogen synthase is activated by...
1. Which of the following is true regarding glycogen metabolism? a. Glycogen synthase is activated by phosporylation. b. Glycogen phosphorylase kinase activates glycogen phosphorylase through phosphorylation. c. The activation of PKA is downstream of insulin signaling in muscle cells. d. Glycogen phosphorylase releases free glucose from the ends of glycogen.
which of the following statements is/are true?? can make more than ONE answer a The oxidation...
which of the following statements is/are true?? can make more
than ONE answer
a The oxidation of glyceraldehyde-3-phosphate requires NAD+ as an electron acceptor. b Under aerobic conditions NADH passes electrons to 02. c Under anaerobic conditions NADH reduces pyruvate to lactate and is thereby recycled to NAD+. You are given three tubes containing three unidentified bacteria. One bacterium lives by fermentation. d One bacterium lives by aerobic oxidation of glucose via the citric acid cycle. One bacterium lives by...
Which statement is true? Epinephrine activates glycogen phosphorylase. Epinephrine increases glycolysis in muscle. Insulin decreases glycogen...
Which statement is true? Epinephrine activates glycogen phosphorylase. Epinephrine increases glycolysis in muscle. Insulin decreases glycogen breakdown by increasing phosphoprotein phosphatase-1 activity. All of the above
QUESTION 4 Which of the following enzymes directly converts phosphorylaseb into the more active form, phosphorylase...
QUESTION 4 Which of the following enzymes directly converts phosphorylaseb into the more active form, phosphorylase a? A. CAMP-dependent protein kinase B. phosphorylase kinase C. protein kinase A D. adenylate kinase E phosphoprotein phosphatase The biotin prosthetic group of pyruvate carboxylase is covalently attached to a residue of the enzyme ? A. Vakine B. serine C. lysine D. arginine E. the biotin is attached non-covalently Which of the following serves as the energy source for the metabolic conversion of oxaloacetate...
McCardle syndrome is due to a skeletal muscle deficiency of glycogen phosphorylase. Which of the following...
McCardle syndrome is due to a skeletal muscle deficiency of glycogen phosphorylase. Which of the following would be observed in such a patient with this syndrome? Skeletal muscle has high level of glycogen with no branches Fasting hypoglycemia Skeletal muscle has high level of glycogen with shorter than normal branches Skeletal muscle has abnormally low glycogen Skeletal muscle has high level of glycogen with normal structure
Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly. The activated r...
Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly. The activated receptor stimulates a G protein, which opens a K channel in the plasma membrane, as shown in the figure below. Which of the following would enhance this effect of the acetylcholine? plasma membrane closed K' channel GTP Pr complex activated α subunit K CHANNEL open K'channel OPENING EXTRACELLULAR SPACE CYTOSOL GTP G-PROTEIN INACTIVATION K" CHANNEL CLOSING closed K' channel rt inactive G protein GOP...
18. Which of the following statements is not true concerning glycolysis in anaerobic muscle A. Its...
18. Which of the following statements is not true concerning glycolysis in anaerobic muscle A. Its rate is slowed by a high (ATP]/(ADP) ratio B. It results in no change of NADH C. It results in net synthesis of ATP D. It is an endergonic process 19. Which of the following enzymes catalyzes the first committed step of glycolysis? A. phosphofructokinase B. hexokinase C. phosphoglucomutase D. glucose-6-phosphate isomerase E. triose phosphate isomerase
ANSWER TO ALL asap (BIOCHEMISTRY) The standard reduction potential of cytochrome cl (Fet) is 0.22 V...
ANSWER TO ALL asap (BIOCHEMISTRY)
The standard reduction potential of cytochrome cl (Fet) is 0.22 V and the standard reduction potential of cytochrome a (Fe3+) is 0.29 V. Is this reaction favorable or not? cytochro cytochrome cl (Fe?") + cytochrome a (Fe) → cytochrome a (Fe?") + cytochrome cl (Fe) A. Favorable B. NOT favorable QUESTION 13 Which of the following is true regarding the activity of phosphofructokinase (PFK)? 1. It is used by glycolysis and gluconeogenesis II. It is...
Regarding inflammasomes, indicate if the following statements are TRUE or FALSE. 19. Inflamasome is the primary...
Regarding inflammasomes, indicate if the following statements are TRUE or FALSE. 19. Inflamasome is the primary mechanism of interferon activation 20. inflammasome components form heptamers when activated by pathogens in the cytoplasm 21. inflammasome formation blocks the kinase activity of caspase-1 22. inflammasomes are found exclusively in macrophage or dendritic cells
QUESTION 4 Which of the following is true of glycogen synthase? • The enzyme has measurable...
QUESTION 4 Which of the following is true of glycogen synthase? • The enzyme has measurable activity only in liver. • It uses glucose-6-phosphate as donor of glucose units • It catalyzes addition of glucose residues to the nonreducing end of a glycogen chain by formation of (a1 + 4) bonds. • The conversion of an active to an inactive form of the enzyme is controlled by the concentration of CAMP
which of the following statements is/are true?? can make more
than ONE answer
a The oxidation of glyceraldehyde-3-phosphate requires NAD+ as an electron acceptor. b Under aerobic conditions NADH passes electrons to 02. c Under anaerobic conditions NADH reduces pyruvate to lactate and is thereby recycled to NAD+. You are given three tubes containing three unidentified bacteria. One bacterium lives by fermentation. d One bacterium lives by aerobic oxidation of glucose via the citric acid cycle. One bacterium lives by...
QUESTION 4 Which of the following enzymes directly converts phosphorylaseb into the more active form, phosphorylase a? A. CAMP-dependent protein kinase B. phosphorylase kinase C. protein kinase A D. adenylate kinase E phosphoprotein phosphatase The biotin prosthetic group of pyruvate carboxylase is covalently attached to a residue of the enzyme ? A. Vakine B. serine C. lysine D. arginine E. the biotin is attached non-covalently Which of the following serves as the energy source for the metabolic conversion of oxaloacetate...
Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly. The activated receptor stimulates a G protein, which opens a K channel in the plasma membrane, as shown in the figure below. Which of the following would enhance this effect of the acetylcholine? plasma membrane closed K' channel GTP Pr complex activated α subunit K CHANNEL open K'channel OPENING EXTRACELLULAR SPACE CYTOSOL GTP G-PROTEIN INACTIVATION K" CHANNEL CLOSING closed K' channel rt inactive G protein GOP...
18. Which of the following statements is not true concerning glycolysis in anaerobic muscle A. Its rate is slowed by a high (ATP]/(ADP) ratio B. It results in no change of NADH C. It results in net synthesis of ATP D. It is an endergonic process 19. Which of the following enzymes catalyzes the first committed step of glycolysis? A. phosphofructokinase B. hexokinase C. phosphoglucomutase D. glucose-6-phosphate isomerase E. triose phosphate isomerase
ANSWER TO ALL asap (BIOCHEMISTRY)
The standard reduction potential of cytochrome cl (Fet) is 0.22 V and the standard reduction potential of cytochrome a (Fe3+) is 0.29 V. Is this reaction favorable or not? cytochro cytochrome cl (Fe?") + cytochrome a (Fe) → cytochrome a (Fe?") + cytochrome cl (Fe) A. Favorable B. NOT favorable QUESTION 13 Which of the following is true regarding the activity of phosphofructokinase (PFK)? 1. It is used by glycolysis and gluconeogenesis II. It is...
QUESTION 4 Which of the following is true of glycogen synthase? • The enzyme has measurable activity only in liver. • It uses glucose-6-phosphate as donor of glucose units • It catalyzes addition of glucose residues to the nonreducing end of a glycogen chain by formation of (a1 + 4) bonds. • The conversion of an active to an inactive form of the enzyme is controlled by the concentration of CAMP
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