Question

Section: 14.4 Gluconeogenesis Section 14.5 13) The oxidative phase of the pentose phosphate pathway: a converts pentoses to hexoses. b. produces ribulose-5-phosphate and NADPH for biosynthetic processes. c. is reversible under physiological conditions. d. has an enzyme requiring thiamine pyrophosphate as a coenzyme. Section: 14.5 Pentose Phosphate Pathway of Glucose Oxidation 14) The nonoxidative phase of the pentose phosphate pathway: a. has a heptose intermediate. b. is irreversible under physiological conditions. c. is impaired in glucose-6-phosphate dehydrogenase deficiency. d. is the reverse of the reactions in the oxidative pha Section: 14.5 Pentose Phosphate Pathway of Glucose Oxidation 15) Which statement regarding the overall pentose phosphate pathway is FALSE? a. It allows interconversion of hexoses and pentoses. b. It is a mitochondrial pathway C. The extent to which glucose-5-phosphate is used by glycolysis versus the pentose phosphate pathway is largely regulated by (NADP'1/INADPH). d. When both phases of the pathway are combined, the primary product is NADPH. Section: 14.5 Pentose Phosphate Pathway of Glucose Oxidation Chapter 12 Section 12.1 16) is NOT one of the six features of signal-transducing systems? e. Desensitization/adaptation f. Amplification 8. Regulation

Answer 1

Section 14.5

13. The Oxidative phase of the Pentose phosphate pathway

ans) b) Produces ribose 5-phosphate and NADPH for biosynthetic processes

Explanation:

The Pentose phosphate pathway has two specific phases.

1) Oxidative Phase

Oxidative Phase in the Pentose Phosphate Pathway will produce ribose 5-phosphate and will generate NADPH for biosynthetic process.

2) Non Oxidative Phase

Non Oxidative Phase is the second one which yield 5-Carbon Sugars.

14. The non oxidative phase of the pentose phosphate pathway

ans) d) is the reverse of the reaction in oxidative phase

Explanation:

The non oxidative phase of the pentose phosphate pathway, which posses reverseible reaction which gives way to the glycolysis intermediates particularly fructose 6-P and glyceraldehyde -3-P, which gets converted as five Carbon Sugars like ribose-5-P and in contra.

15. Which statement regarding the overall pentose phosphate pathway is FALSE

ans) b) It is a mitochondrial pathway

Explanation:

Pentose Phosphate Pathway is not a mitochondrial pathway. It is a metabolic pathway which is parallel to glycolysis. It leads to the formation of Pentoses ie., 5-Carbon sugars, NADPH and ribose 5-phosphate, which precedes for nucleotide Synthesis.

Section 12.1

16) ___________ is NOT one of the Six features of signal transducing Systems?

ans) g. Regulation

Regulation comes under Pentose Phosphate Pathway.

Explanation

Regulation comes under Pentose Phosphate Pathway.

What is Signal transducing Systems?

A Course of action which is responsible for the transference of a Signal to the overall Organism, exclusively in a crosswise or through a Cell is called Signal transduction. A System which carries out this process is called Signal transducing System.

Features of Signal Transducing Systems

1) Specificity

2) Amplification

3) Modularity

4) Desensitization/Adaption

5) Integration