Preview

Urease

Powerful Essays
Open Document
Open Document
1423 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Urease
An experiment to determine the amount of urea in a specimen of urine.

Introduction.

Metabolism produces a number of toxic by-products, particularly the nitrogenous wastes that result from the breakdown of proteins and nucleic acids. Amino (NH2) groups are the result of such metabolic reactions and can be toxic if ammonia (NH3) is formed from them. Ammonia tends to raise the pH of bodily fluids and interfere with membrane transport functions. To avoid this the amino groups are converted into urea, which is less toxic and can be transported and stored to be released by the excretory system.
Urea is the result of two amino groups being joined to a carbonyl (C=O) to form CO(NH2)2, the process of which is called the ornithine cycle and takes place in the liver. The ornithine cycle was developed by Hans Krebs in 1932 and is similar to the Krebs cycle through the use of oxaloacetate. One of the steps in the cycle the breakdown of arginine into ornithine and urea, a reaction catalysed by the enzyme arginase. (See below) (Fig 1.0)

Arginine Orthinine Urea

Urease is the enzyme which catalyses the hydrolysis of urea according to the following equation:

(NH2)2CO(aq) + 3H2O(l)  CO2(g) + 2NH3(g)

The acidic ammonium carbonate is formed because the carbon dioxide dissolves in water to produce carbonic acid (H2CO3), which immediately reacts with ammonia to form the ammonium carbonate. This is shown by the following equation:

2NH3(g) + H2CO3(aq)  (NH4+)2CO3(aq)

The resulting solution can then be titrated against hydrochloric acid with methyl orange as the indicator in order to determine how much urea was present initially. The point of neutralisation using a methyl orange indicator is determined using the following colour changes.

 Acid  Red.
 Neutral  Yellow.
 Alkali  Orange.

Enzymes are nearly all made up of globular proteins. The structure

You May Also Find These Documents Helpful

  • Powerful Essays

    Chapter 10 review

    • 3492 Words
    • 14 Pages

    The end product of muscle metabolism is: a. b. c. D uric acid carbon dioxide ammonia creatinine Mader - 010 Chapter... #36 3 15. Blood pressure in the glomerular capillaries is: a. b. c.…

    • 3492 Words
    • 14 Pages
    Powerful Essays
  • Satisfactory Essays

    The proteins we gain through eating are processed into amino acids and use to replace the proteins already found in the body. There is a total of 20 different amino acids that combine together to make the different proteins. Amino acids that cannot be produce by the body are known as essential amino acids, and are acquired through the foods we eat. These essential amino acids are necessary for the body to function.…

    • 450 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Without the BCKD enzyme, those amino acids will be accumulated abnormally throughout the body and build up to toxic levels.…

    • 596 Words
    • 3 Pages
    Good Essays
  • Better Essays

    Metabolic reactions that take place within the body can produce a surplus of amino acids of which can be converted into the waste product otherwise known as urea through the process of deamination in the liver. Proteins obtained through an individual’s diet are broken down into amino acids. The excess amino acids made during this process are unable to be stored in the…

    • 2787 Words
    • 11 Pages
    Better Essays
  • Satisfactory Essays

    Biology Quiz Paper

    • 1178 Words
    • 5 Pages

    | | The most important source of nitrogen entering the body is from: | | | Student Response | Value | Correct Answer | Feedback | A. | nucleic acids. | | | | B. | amino acids contained in dietary protein. | 100% | | | C. | urea. | | | | D. | ammonia.…

    • 1178 Words
    • 5 Pages
    Satisfactory Essays
  • Powerful Essays

    Atkins or "fadkins"

    • 1253 Words
    • 5 Pages

    3. Janine also said: “ If you eat way too much protein and not enough carbs you can ruin your kidneys forever because of all the nitrogen you have to process breaking down the protein. Find out if Janine is right about this, too. Check a biology textbook for…

    • 1253 Words
    • 5 Pages
    Powerful Essays
  • Good Essays

    Amino Acids Research Paper

    • 1177 Words
    • 5 Pages

    Amino acids are biologically organic compounds containing amine and carboxylic acid functional groups, usually along with a side-chain specific to each amino acid. The elements that are key of an amino acid are carbon, hydrogen, oxygen, and nitrogen. There are about 500 different kinds of amino acids found but we recognize 23 of the amino acids that are known, they are classified into three groups, essential semi-essential, and non-essential. Each amino acid has unique characteristics arising from the size, shape, solubility, and ionization properties of its R group. In the form of proteins, amino acids comprise the second-largest component of human muscles, cells and other tissues, water being first. Outside proteins, amino…

    • 1177 Words
    • 5 Pages
    Good Essays
  • Good Essays

    Hydrolysis Report

    • 1525 Words
    • 7 Pages

    Hydrolysis is a chemical reaction that uses water to split complex molecules. The water molecule H2O is split in the mechanism of hydrolysis, hydrogen cations and hydroxide anions. When the enzyme catalyzes its reaction inside the cell, it is referred to as intracellular hydrolases. When the enzymes secreted from the organism to catalyze reactions outside the cell, it is referred to as exoenzymes or extracellular hydrolases. Four hydrolysis reactions are discussed in the report, bile esculin hydrolysis, starch hydrolysis, urea hydrolysis and casein hydrolysis. Bile esculin hydrolysis determines whether an organism is able to hydrolyze the glycoside esculin. Starch Hydrolysis identifies organisms that can hydrolyze starch. Urea hydrolysis tests for the ability of organisms to hydrolyze urea via the intracellular enzyme urease. Casein hydrolysis tests for organisms capable of hydrolyzing casein via the casease.…

    • 1525 Words
    • 7 Pages
    Good Essays
  • Powerful Essays

    The digestive system

    • 5068 Words
    • 21 Pages

    Chemical breakdown results from the action of digestive enzymes and other chemicals acting on food as it passes through the GI trac…

    • 5068 Words
    • 21 Pages
    Powerful Essays
  • Good Essays

    Excretion: A primary waste product of cellular metabolism is ammonia, a poisonous substance that contains nitrogen. A buildup of ammonia and other waste products would kill an animal. Therefore, excretion is critical to life. Most animals have an excretory system that either eliminates ammonia quickly or converts it into a less toxic substance that is removed from the body. Excretory systems vary from groups of cells that pump water out of the body to complex organs such as kidneys.…

    • 468 Words
    • 2 Pages
    Good Essays
  • Good Essays

    acids are broken down, they release toxic ammonia (NH3). To rid the body of this…

    • 635 Words
    • 3 Pages
    Good Essays
  • Better Essays

    Niacin Informative Speech

    • 1056 Words
    • 5 Pages

    ,,,,,, As you may remember from your high school biology courses, glycolysis, the citric acid cycle and the electron transport chain are responsible for creating ATP which is our body’s main energy source. Niacin also plays an important role in DNA repair as well as steroidal hormone production from the adrenal glands.,,,,,,…

    • 1056 Words
    • 5 Pages
    Better Essays
  • Powerful Essays

    Unit 8.3.1 Study Guide

    • 4808 Words
    • 20 Pages

    | The removal of metabolic waste products from the body eg. Nitrogenous wastes such as urea.…

    • 4808 Words
    • 20 Pages
    Powerful Essays
  • Good Essays

    Amines and Amines

    • 671 Words
    • 3 Pages

    Amines are the smaller and simpler products of the decomposition of larger and more complex organic compounds like proteins. They often have foul odours, as do many nitrogen compounds, such as the smell of rotting fish and decomposing animal tissue and are produced by bacteria.…

    • 671 Words
    • 3 Pages
    Good Essays
  • Better Essays

    metabollic pathways

    • 1088 Words
    • 5 Pages

    Rates of drug metabolism vary from a patient to another. This is brought about by differences in genetic factors, co-existing disorders and the drug interactions. In many cases of drugs, metabolism occurs in two phases. The phase (I) reactions normally involve the formation of a new functional group. The phase (II) reactions involve the conjugation with a substance that is endogenous such as an acid, sulfate. The reactions in phase (II) are synthetic in nature. Metabolites from synthetic reactions are readily excreted by the kidneys and liver organs. The rate of Metabolism increases with the drug concentration increase. There are two types of metabolism, catabolism and anabolism. In anabolism, energy is directed towards the synthesis of cellular components from small molecules. In catabolism, large molecules are broken down to produce energy.…

    • 1088 Words
    • 5 Pages
    Better Essays