MICRO CH16and17and18

MICRO CH16and17and18 - • At this point, pyruvate can...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: • At this point, pyruvate can either be used: – in – in Fermentation vs. Respiration • Fermentation – from 1 glucose molecule a net of 2 ATP are produced – partial – reduction of • fermentation products • • Respiration – from 1 glucose molecule up to 38 ATP are produced – complete – oxidation of pyruvate by – uses Fermentation • During fermentation, • During glycolysis, electrons from glucose are passed to 2 NAD+ creating 2 NADH • In fermentation, electrons from NADH are passed to • In this process (glycolysis followed by fermentation reactions), net gain of 2 ATP are made by Types of fermentation 1. Homolactic fermentation- once electrons from NADH are passed to • Ex. Lactobacillus ferments lactose sugar in milk to produce 2. Alcoholic fermentation- once electrons are passed from NADH to pyruvate, • Ex. Yeast ferment the sugar in malted grains to produce • In both types of fermentation, the electron donor is • Fermentation- energy generating process where one organic compound (ex.glucose) serves as the electron donor and a product of that compound serves as the electron acceptor (ex.pyruvate). Respiration • Some chemoheterotrophs can use oxygen or other compounds from the environment to • If electron acceptor is oxygen, process is called aerobic respiration • If electron acceptor is other compound from environment, process is called anaerobic respiration – final electron acceptor may be an inorganic compound such as nitrate, • In fermentation, the final electron acceptor is made by the cell from the electron donor – (ex. Pyruvate made form glucose • In respiration, the final electron acceptor is a compound found in the environment – (ex. Oxygen, nitrate The tricarboxylic acid (TCA) cycle • aka- Kreb’s cycle, citric acid cycle • cyclic pathway used to fully • End products: – – – CO2 (waste product) – Precursor metabolites • Occurs during • ______________________ completely to CO 2 • Only possible with • Respiration produces more energy than fermentation • ________________________________ complex – Converts pyruvate to acetyl-CoA • Substrate for TCA is • Precursor metabolites made in TCA cycle: – Alpha-ketoglutarate & oxaloacetate (used to make amino acids & nucleotides) Reactions of the TCA cycle • Acetyl CoA + oxaloacetate= • During this cycle, acetyl CoA is oxidized to CO 2 & original oxaloacetate is regenerated • ________________ released • _________________________________ are generated • precursor metabolites are See Fig 13.27 Aromatic Catabolism • Bacteria can degrade many compounds – Pseudomonas , Rhodococcus • ________________ compounds converted to – Allows growth in – Used for • Cleaning up • Cleaning industrial sites • Degrading Aerobic respiration • In aerobic respiration, the pair of electrons from NADH is passed through a series of intermediates to • NADH is oxidized back to NAD+, • Oxygen is the • There are several types of intermediates that pass electrons from...
View Full Document

This note was uploaded on 02/23/2012 for the course BIOL 2051 taught by Professor Brininstool during the Fall '07 term at LSU.

Page1 / 32

MICRO CH16and17and18 - • At this point, pyruvate can...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online