Biochemistry MC Questions. Quick response! Please correct answers. Biochemistry
ID: 207837 • Letter: B
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Biochemistry MC Questions. Quick response! Please correct answers. Biochemistry MC Questions. Quick response! Please correct answers. Biochemistry MC Questions. Quick response! Please correct answers. 11. Which of the folliowing is not true regarding slycogen? A) glycogen is a polymer of glucose units B) its degradation and synthesis are coordinately regulated C) it cannot be depleted from the liver since its storage is highly conserved. D) the breakdown of stored glycogen in the liver provides glucose to other tissues E) an enzyme catalyzes the cleavage of glycogen releasing glucose 12. Ketone bodies are formed in the liver and transported to other tissue via the blood mainly as: A) oxaloacetate and acetate B) pyruvate and alanine. C) -hydroxybutyryl-CoA derivatives. D) lactate and pyruvate. E) -hydroxybutyrate and acetoacetate. A for fatty acid synthesis? A) It is stimulated by citrate. B) It requires ATP. c) It requires bicarbonate (soluble form of CO) D) It requires NADPH, H E) it is inhibited by palmitate. 14. Which of the following does not occur in glucagon stimulated regulation of metabolic pathways. A) activation of protein kinase A B) activation of fructose-2,6-bisphosphatase C) inhibition of glycogen synthase D) activation of hormone sensitive lipase E) activation of an enzyme that degrades CAMP 15if malonyl-CoA is synthesized from radiolabeled "co, and unlabeled acetyl-CoA, and the labeled malonate is then used for fatty acid synthesis, the final fatty acid product ill have radioactive "C carbon in: A) no C atom B) every C atom. C) every even-numbered C-atom D) every odd-numbered C-atom. E) only the omega-carbon atom (farthest carbon from C-1). 16. The control of fatty acid synthesis and catabolism is regulated by which factors? Malonyl-COA inhibits the transport of fatty acids into the mitochondrial matrix Each process occurs in a separate cellular compartment. A) B) C) Acetyl CoA carboxylase is inhibited by hormone induced phosphorylation by PKA E) A and 8 only B and C above. 17. Gluconeogenesis is the synthesis of A) glucose from glycogen B) pyruvate from glucose C) glucose from non-hexose precursors D) fatty acids from glucose and other hexoses E) cholesterol from acetyl-CoA CHEM 432 ExamExplanation / Answer
11. It cannot be depleated from the liver since its storage is highly conserved.
This statement is wrong because during exercise glycogen gets depleted from liver.
12. Beta- Hydroxybutyrate and acetoacetate.
There are three ketone bodies Beta-hydroxybutyrate,acetoacetate and acetone. Acetone cannot be reconverted to acetyl-CoA and hence released through urine whereas others reconvert.
13. It is inhibited by palmitate. This is wrong because starting point of fatty acid synthesis is palmitic acid.
14. Activation of enzyme that degrades cAMP. This statement is not true because glucagon triggers production of cAMP.
15. only the omega carbon atom
16. A,B and C above
17. Glucose from non-hexose precursor.
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