Which of the following statements is correct concerning biotin. A. Intestinal biotinyl carboxylase cleaves biotin from biotin-containing proteins B. Biotinidase cleaves biocytin to yield biotin C. The first step in the intestinal digestion of biotin –containing proteins is the oxidation of the valeric side chain D. A and B E. B and C 8. Identify
7. All of the following statements about oxidation of carbonyls are true except A) oxidation of aldehydes produces carboxylic acids. B) oxidation of ketones produces esters. C) Tollens' test involves reduction of Ag+. D) benedict's test involves reduction of Cu2+.
3. Oxidation of p-methylacetanilide. Here the methyl group on p-methylaniline is oxidized with potassium permanganate to transform the methyl group into a carboxyl-group and ultimate create p-acetamidobenzoic acid. 4. Hydrolysis of p-acetamidobenzoic acid will transform the amide group into an amine group and will create the amino acid p-aminobenzoic acid.
1. Average size of prokaryotes is: a. less than 2 microns 2. The periplasmic space separates the plasma from the outer membrane in Gram-negative bacteria b. True 3. What is/are the important biological function(s) of polysaccharides?
Activity III Questions Name these compounds: [pic] Compound A: Trans-2-Pentene Compound B: Cis-2-Pentene Provide a proper name for the compound below: 1. 1,2-Dimethylcyclobutane [pic] 2. Can this molecule be named as cis or trans? [pic] The molecule would be named cis because both of the hydrogens are on the same side of the double bond. 3.
Synthesis of the Diels-Alder Adduct Purpose: To investigate the methods behind Diels-Alder chemistry through the synthesis of 4-cyclohexene-cis- 1,2-dicarboxylic anhydride from butadiene sulfone and maleic anhydride. By using a hands-on approach through laboratory synthesis, I hope to gain a better understanding of the concepts governing Diels-Alder reactions. Theory: The Diels-Alder reaction is a cycloaddition reaction that occurs between a conjugated diene, a molecule with two alternating double bonds, and dienophile, an alkene, to form rings and bicyclic compounds. Because it involves the interaction of four π electrons that are supplied by the diene and the two π electrons supplied by the dienophile, the Diels-Alder reaction is often called [4 + 2] cycloaddition. In the reaction, two new σ bonds are formed and one π bond is formed at the expense of two π bonds, which results in a cyclic product.
Mendeleev was able to realize that he could arrange the 65 known elements on the table so that each element had a higher atomic weight than the atom on its left and similar properties as the elements in its column. By charting the elements like this, Mendeleev could see where there were gaps, meaning that there were more elements to discover. Each row of elements across the table is a period. There are seven periods. Every row down the table is a group, of which there are eighteen.
In all forms of digestion (whether of proteins, carbohydrates, or fats), larger molecules are broken down into smaller molecules by a reaction with water in which a water molecule is split in two, with each part joining a different product molecule. This type of reaction is called hydrolysis. Remember that proteins are long chains of amino acids linked together by amide functional groups called peptide bonds. When protein molecules are digested, a series of hydrolysis reactions convert them into separate amino acids. RCONR2 + H2O RCO2H + HNR2 In the laboratory, the reaction above is very slow unless a strong acid catalyst is added to mixture, yet in the small intestines, where the conditions are essentially neutral rather than acidic, most of the hydrolysis of proteins takes place rather quickly.
NADH dehydrogenase removes the electrons with the hydrogen atom from NADH. NADH dehydrogenase contains a flavin mononucleotide molecule that allows for the acceptance of electrons and a hydrogen from NADH. NADH dehydrogenase shuttles the hydrogen ion from NADH into the mitochondrial intermembrane space, then passes the electrons down the ETC cycle. NADH dehydrogenase contains an iron sulphur complex that allows transfer of electrons to coenzyme Q (CoQ) which is an intermediary complex between Complex 1 and Complex 3. An alternate name for Complex Q is Ubiquinone.
In this experiment we will perform a Grignard addition to an ester. First we will form the Grignard reagent from magnesium and bromobenzene and then we will add it to methyl benzoate to produce triphenylcarbinol (also called triphenylmethanol). Since we are using an ester as our electrophile in this reaction, the nucleophilic Grignard reagent, prepared from the bromobenzene and magnesium, will add to the carbonyl two times to give the triphenyl adduct that on treatment with aqueous acid gives the free alcohol. Method : Preparation of triphenylcarbinol through Grignard reaction involves three steps. The first step is preparation of Grignard reagent which has a formula of RMgX,