Purchase Solution

DNA mRNA Role of a Coenzyme

Not what you're looking for?

Ask Custom Question

Consider the role of the coenzyme NAD in glucose oxidation. In the process of glycolysis the formation of pyruvate involves the reduction of the coenzyme NAD to NAD.2H.

(a) Which other stages of glucose oxidation produce molecules of the reduced coenzyme, NAD.2H?

(b) Explain what happens to NAD.2H produced during glycolysis in:

i) an animal cell respiring aerobically
ii) an animal cell respiring anaerobically

(c) The oxidation of NAD.2H is an energy-releasing process. Name the energy-requiring process it is coupled to and why this is important for the cell.

Purchase this Solution

Solution Summary

The expert analyzes the DNA mRNA role of a coenzyme. The stages of glucose oxidation which produces molecules of the reduced coenzyme is determined.

Solution Preview

(a) NADH is produced in the oxidation of glucose to CO2 (carbon dioxide). Essentially, NAD is reduced to NADH while glucosed is oxidized to CO2. But that oxidation to carbon dioxide doesn't take place in just one step. It occurs in a multitude of steps through glycolysis and the Krebs cycle. NADH is produced in the conversion of glyceraldehyde-3-phosphate to glycerate-1,3-bisphosphate. This is the single step in glycolysis where NADH is produced that is mentioned in the question. But, in addition to that, NADH is also produced in the Krebs cycle (tricarboxylic acid cycle, TCA) and in the preparatory step to make acetyl-CoA.

Essentially, when pyruvate is converted to acetyl-CoA, NAD is reduced to NADH.

Also, in the Krebs cycle itself, NADH is produced ...

Purchase this Solution


Free BrainMass Quizzes
Pregnancy Knowledge

How much do you know about being pregnant? Test your Pregnancy IQ with this quiz!

The Transfer of Energy in an Ecosystem

This quiz will assess your knowledge of how energy is transferred in an ecosystem and the different levels of trophic organization.

Bacterial Genetics

This quiz test your knowledge of the genetics of bacteria.

Basic Immunology Quiz

Intro to immuno quiz. Covers the basics of immunology and recognition of foreign substances by the body.

Light and Sight Vocabulary

This quiz introduces basic definitions of vocabulary related to light and how human eyes. This information is important for an understanding of sight.