Question

please answer 1-6 :) 1. Glycogen metabolism is regulated, up to a point, by a cyclic...

please answer 1-6 :)

1. Glycogen metabolism is regulated, up to a point, by a cyclic AMP cascade. At what point do glycogen synthesis pathways diverge from glycogen degradation pathways?

a. Protein kinase A leads to the activation of glycogen degradation, and also to the inhibition of glycogen synthase by conversion from b to a.

b. Phosphorylase kinase converts phosphorylase b to phosphorylase a and glycogen synthase a to glycogen synthase b.

c. Protein kinase A leads to the activation of glycogen degradation, and also to the inhibition of glycogen synthase by conversion from a to b.

d. Phosphorylase kinase converts phosphorylase a to phosphorylase b and glycogen synthase a to glycogen synthase b.

e. Cyclic AMP converts inactive PKA to active PKA, causing the inactivation of phosphorylase kinase.

2. The activated glucose donor of glycogen synthesis is:

a. glucose 1,6-bisphosphate.

b. uridine diphosphate glucose.

c. glucose 1-phosphate.

d. uridine triphosphate glucose.

e. glucose 6-phosphate.

3. A complete oxidation of a glucose residue derived from glycogen yields _____ ATP.

a. 4

b. 7

c. 31

d. 2

e. 11

4. How many molecules of ATP are hydrolyzed to incorporate one dietary glucose molecule into glycogen?

a. 2

b. 6

c. 8

d. 4

e. 1

5. What enzymes regulating liver-glycogen metabolism predominate in the fasting state? Select all that apply.

a. glycogen phosphorylase a

b. glycogen phosphorylase b

c. glycogen synthase b

d. protein phosphatase 1

e. glycogen synthase a

6. What protein is activated in the cytoplasm due to activation of the insulin receptor?

a. protein kinase A

b. protein phosphatase 1

c. glycogen phosphorylase

d. glycogen synthase kinase

e. insulin-receptor substrate

Homework Answers

Answer #1

1. C is the right answer. Glycogen synthesis pathways diverge from glycogen degradation pathways when protein kinase A leads to activation of glycogen degradation and also inhibition of glycogen synthase by conversion from a to b.

2. B is the right answer. The activated glucose donor in the glycogen synthesis is uridine diphosphate glucose. It is the activated form of glucose and glycogen synthase helps in transferring the glucose to growing glycogen chain.

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
please answer 1-4 1. The debranching enzyme releases a free glucose molecule by: a. phosphorylation of...
please answer 1-4 1. The debranching enzyme releases a free glucose molecule by: a. phosphorylation of the glucose residue. b. hydrolysis of the α-1,6-glycosidic bond. c. shifting a phosphoryl group from C-1 to C-6 in the glucose residue. d. hydrolysis of the α-1,4-glycosidic bond. e. dephosphorylation of the glucose residue. 2.  One mechanism for turning off glycogen degradation involves the removal of a phosphate group from glycogen phosphorylase by the enzyme _______. 3. How many glucose molecules can one glycogen phosphorylase...
During prolonged fasting, the majority of glucose produced by liver cells is due to the action...
During prolonged fasting, the majority of glucose produced by liver cells is due to the action of A) glucose-6-phosphatase B) glucokinase C) insulin-responsive tyrosine kinase D) hexokinase E) AMP-dependent protein kinase (AMPK)
1)Which of the following will be affected in an opposite manner (inhibited by one and stimulated...
1)Which of the following will be affected in an opposite manner (inhibited by one and stimulated by the other) by cAMP-dependent protein kinase and AMP-activated protein kinase? Select all that apply Phosphofructokinase-2 in ischemic heart Lipolysis in adipose tissue Glycogenesis in skeletal muscle Glycogenolysis in liver Cholesterol biosynthesis in liver Gluconeogenesis in liver Glucose uptake via GLUT 4 transporters 1)Which of the following will be activated by phosphorylation of key enzymes by protein kinase A (cAMP dependent protein kinase? (select...
1. Which sentence best defines signal transduction in a biochemical context? a. Alteration of cell functions...
1. Which sentence best defines signal transduction in a biochemical context? a. Alteration of cell functions in response to the environment b. Generation of a chemical change in response to information c. Induction of cell death upon nutrient starvation d. Responses to stimuli 2. Which statement is correct? a. G protein-coupled receptors produce second messengers indirectly while receptor enzymes catalyse second messenger generation b. Second messengers stimulate the activity of G protein-coupled receptors. c. Receptor enzymes produce second messengers through...
Bioinformatics #4 1. What does the box labeled “INSR” refer to, and how many amino acids...
Bioinformatics #4 1. What does the box labeled “INSR” refer to, and how many amino acids are found in this protein? Insulin; 1382 Insulin receptor; 1382 Insulin; 4149 Insulin receptor; 4149 2. For INSR, the membrane-bound location of this protein is __________________, while the dephosphorylated form of this protein, the active (or sensitized) state, is indicated by the ____ symbol. a. indicated by the 2 thick parallel gray lines on the map; +p B. indicated by the 2 thick parallel...
1- Nonreceptor tyrosine kinases are: Select one: a. Transmembrane receptors b. Membrane proteins with no enzymatic...
1- Nonreceptor tyrosine kinases are: Select one: a. Transmembrane receptors b. Membrane proteins with no enzymatic activity c. Enzymes that phosphorylate serine and threonine residues d. Peripheral membrane enzymes that associate with receptors e. Inhibitors of transmembrane receptors 2- Which of the following statements about MAP kinase pathways is FALSE? Select one: a. MAP kinases phosphorylate serine and threonine residues b. MAP kinases can be activated by tyrosine kinases c. MAP kinases are present in all eukaryotic cells d. MAP...
1. A membrane bilayer has two sides, side A and side B. If there are 100...
1. A membrane bilayer has two sides, side A and side B. If there are 100 glucose molecules on side A and 46 on side B, the free energy of moving glucose from side B to side A is: A. positive B. negative C. zero, because glucose is uncharged D. It depends on the temperature, which is not given. 2. Which of the following statements about lipids is not true: A. Lipids are mostly made of carbon and hydrogen atoms....
Adenylyl cyclase and PI-PLCb are Which of the following answers is incorrect? a. both effectors in...
Adenylyl cyclase and PI-PLCb are Which of the following answers is incorrect? a. both effectors in GPCRs’ signaling pathways b. both produce secondary messengers when activated by the trimeric G protein-alpha subunit. c. both inactivated when trimeric G protein-alpha subunit is hydrolyzing the GTP to GDP. d. both activated by the activated trimeric G protein-alpha subunit. e. both activated by the trimeric G protein-alpha subunit binding to GDP. what is the major functional difference between GPCRs and RTKs? a.RTKs can...
4. What is the difference between a tyrosine kinase and a serine/threonine kinase? (a)  One is involved...
4. What is the difference between a tyrosine kinase and a serine/threonine kinase? (a)  One is involved in signal transduction and one is not. (b)  One adds phosphate groups to proteins, the other removes them. (c)  One adds phosphate groups to proteins, the other adds phosphate groups to sugars. (d)  One is used in animals, the other in plants. (e)  They add phosphate groups to different amino acid side chains in proteins. 5.  Kinase cascades are useful in signal transduction because: (a)  they are species specific (b)  they...
1.) which statement does not describe a step in the response to photon absorption by rhodopsin?...
1.) which statement does not describe a step in the response to photon absorption by rhodopsin? a. Rhodopsin catalyzes GDP/GTP exchange on transducin b. light absorption converts all-trans-retinal to 11-cis-retinal c. all-trans-retinal is replaced with 11-cis-retinal d. rhodopsin is phosphorylated by rhodopsin kinase e. arrestin binds to the phosphorylated end of rhodopsin 2.) what is the abbreviated nomenclature for a 14-carbon omega-3 fatty acid that contains no other double bonds? a. 13:1 (delta11) b. 14:1 (delta3) c. 14:0(delta11) d. 17:1(delta14)...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT