Question

Can someone quick answer/check these questions? Thank you, will rate! (the answers that I have came up with are in bold) Please help

51- Glycogenesis involves the following steps

a) isomerisation

b) activation

c) elongation or coupling

d) branching

e) all of the above

           

52 During the breakdown of glycogen, free glucose is formed from

A. the reducing end.

B. the non-reducing end.

C. glucose residues in an a 1-->4 linkage to the chain.

D. glucose residues in an a 1-->6 linkage to the chain.

E. hydrolysis of glucose 1-phosphate.

57-In the following pathway for conversion of glucose to glycogen, what is compound X?

glucose --> glucose 6-P --> X --> UDP-glucose ---> glycogen

A. glucose 6-pyrophosphate

B. glucose 1-phosphate

C. glucose 1,2-bisphosphate

D. fructose 6-phosphate

E. no intermediate is missing.

58. Theoretically, the maximum number of moles of ADP (or equivalent) phosphorylated to ATP (or equivalent) as one mole of glucose is completely oxidized to carbon dioxide and water in a liver cell is

A. 0

B. 2

C. 12

D. 24

E. 38

59. The enzyme that catalyzes the substrate-level phosphorylation of GDP to GTP in the TCA cycle is

A. 3-phosphoglycerate kinase.

B. succinyl-CoA synthase.

C. pyruvate kinase.

D. alpha ketoglutarate dehydrogenase.

E. succinate thiokinase

60. The tricarboxylic acid cycle is initiated by the condensation of

A. NAD and malate.

B. pyruvate and oxaloacetate

C. NAD and citrate.

D. acetyl-CoA and oxaloacetate.

E. acetyl-CoA and pyruvate.

64 Which enzyme complex in the TCA cycle requires the cofactors thiamine pyrophosphate, lipoic acid, CoA, FAD and NAD⁺?

A Citrate synthase

B a-ketoglutarate dehydrogenase

C Succiny-CoA synthetase (succinate thiokinase)

D Malate dehydrogenase

E Fumarase

65. You are the team physician for your local women's soccer team. Some of your new recruits have been disabled due to injury for the past four months and are about to start a conditioning program. Since their aerobic fitness is crucial to the stamina needed for the game of soccer, you put them on a progressive interval running program. As their aerobic fitness increases, which of the following enzymes in their skeletal muscle do you expect to mirror that increase?
A. Lactate dehydrogenase.
B. PEP carboxykinase.
C. Transaminase.
D. Hexokinase.
E. Succinate dehydrogenase.

66. Which of the following enzyme systems is most analogous to the pyruvate dehydrogenase complex?
A. malate dehydrogenase
B. succinate dehydrogenase
C. fumarase
D. isocitrate dehydrogenase
E. alpha-ketoglutarate dehydrogenase

67. Which enzyme would be impaired in a biotin deficiency?
A. fructose 1,6-bisphosphatase.
B. pyruvate kinase.
C. PEP carboxykinase.
D. pyruvate carboxylase.
E. malate dehydrogenase

68- Which of these statements is FALSE?

a) H type LDH subunits predominates in aerobic tissues such as heart muscle

b) M type LDH subunits predominates in anaerobic tissues such as skeletal muscle

c) H4 LDH has a low Km for pyruvate and is inhibited by high levels of pyruvate.

d) The M4 LDH enzyme has a high Km for pyruvate and is not inhibited by pyruvate.

e) The M type LDH is utilized for oxidizing lactate to pyruvate

Answer 1

Ans 51 e) All of the above

Gkycogenesis is the process in which glucose is formed out of glycogen .

The process involves activation of insulin followed by isomerization. Then UTP is converted into UMP to couple with glucose-1-phosphate . The branching occurs by the frmation of alpha 1-6 bonds.