In the absence of oxygen, the metabolic fate of pyruvic acid will be :
It will be utilized for reoxidation of NADH
Glycolysis reduces NAD+ to NADH at the glyceraldehyde-3-phosphate dehydrogenase step. Without oxygen the electron transport chain cannot reoxidise this NADH, so glycolysis would stop as soon as the NAD+ pool ran out.
In fermentation, pyruvate itself (lactate dehydrogenase in muscle and lactic bacteria) or its decarboxylation product acetaldehyde (alcohol dehydrogenase in yeast) acts as the electron acceptor, regenerating NAD+ so glycolysis can continue.
Complete oxidation of pyruvate to CO2 through the link reaction and the citric acid cycle requires oxygen as the final electron acceptor, so it cannot occur anaerobically. Pyruvate is reduced, not partially oxidised, in lactate fermentation, and its fate is set by oxygen supply rather than by energy need.
Hence, It will be utilized for reoxidation of NADH.
Similar Questions
DNA is supercoiled state can be relaxed by an enzymatic process. Which enzyme catalyses relaxation of supercoiled DNA?
Adaptive radiation produced numerous lineages from reptiles during chordate evolution. One of the following gave rise to mammals:
Which one produces highest isotope effect?
Which one of the following conditions is true for parthenogenesis?
The urge to inhale in human being results from:
Which of the following is responsible for triggering formation of other enzymes?
Which of the following is critical for differentiation of bipotential gonads towards ovarian pathway?
The PCR technique that allows measuring of DNA amplification at each cycle of PCR rather than the end point detection is:
Abscisic acid responsive elements (ABREs) are over-represented in promoter of genes involved in ............
In humans pointed eyebrows are dominant over smooth eyebrows and downward pointed frontal hairline is dominant over continuous hairline. What phenotypic ratio would you expect in the offspring from a cross between an individual heterozygous for both genes and an individual homozygous recessive for both genes?
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
