Concept explainers
(a)
Interpretation: To determine the structural difference between ADP and AMP.
Concept introduction:
(b)
Interpretation: To determine the structural difference between ATP and CTP.
Concept introduction: Nucleotide is the basic unit required for the formation of nucleic acid which is required for completion of various metabolic reactions. The basic structure of nucleotide consists of three units: nitrogen-containing base, a pentose sugar, and a phosphate group. The nitrogen-containing base and pentose sugar are collectively known as a nucleoside. A nucleoside unit attached to a phosphate group together forms a nucleotide unit. ATP, AMP, ADP, and CTP are examples of nucleotides present in the human body.
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EBK GENERAL, ORGANIC, AND BIOLOGICAL CH
- A histidine was determined to be the critical residue involved in an enzyme-catalyzed reaction. If the pKa of the histidine is known to be 6.5 in the active site and the pH of maximum catalytic activity is 7.2, what is likely the primary role of histidine in the catalytic reaction? A. forms a covalent bond with the substrate B. reduces the entropy of the substrate C. stabilizes a charged intermediate D. acts as a proton donor Aspartate and lysine are in the active site of an enzyme. They are both known to participate directly in catalysis. The pKa's of the residues are found to be 3.2 and 9.6, respectively for aspartate and lysine. The optimum pH for the enzyme is 6.4. Which forms of these two residues will predominate when the enzyme is most active? A. aspartate is protonated; lysine is deprotonated B. both residues are deprotonated C. aspartate is deprotonated; lysine is protonated D. both residues are protonatedarrow_forwardMatch each reaction description to the type of enzyme that catalyzes the reaction. 1. Oxidation and reduction of compounds 2. Transfers a functional group from one compound to another compound 3. Utilizes water to break bonds within a compound 4. Addition/removal of a group of atoms and bonds within a compound 5. Forms a bond between two compounds A. Ligase B. Transferase C. Hydrolase D. Oxidoreductase E. Isomerase F. Lyasearrow_forwardWhich of the following enzyme classes catalyze reactions in which two molecules become covalently linked to each other? A. Kinase B. Hydrolase C. Isomerase D. Ligasearrow_forward
- Researchers have identified an enzyme that can catalyze two different chemical reactions. Which of the following is most likely true based on this finding? A B C D The reactants involved in the two reactions are very similar in their charge and shape. The reactant in one reaction acts as an allosteric inhibitor while the reactant in the sec- ond acts as an allosteric activator. The enzyme contains both alpha-helices and beta-sheets in their secondary structures. The catalytic activity of the enzyme is dependent on both competitive inhibition and al- losteric regulation.arrow_forwardUse drawings to explain how an enzyme (such as hexokinase, mentioned in the text) can distinguish its normal substrate (here d-glucose) from the optical isomer l-glucose, which is not a substrate. (hint: remembering that a carbon atom forms four single bonds that are tetrahedrally arranged and that the optical isomers are mirror images of each other around such a bond, draw the substrate as a simple tetrahedron with four different corners and then draw its mirror image. using this drawing, indicate why only one optical isomer might bind to a schematic active site of an enzyme.)arrow_forwardWhich of the following is a primary function of molecule b ?arrow_forward
- Sphingolipids can contain of all of the following except A. glycerol. B. sphingosine. C. phosphocholine. D. a mono- or oligosaccharide.arrow_forwardWould you expect the products of an endergonic reaction to be more stable than the reactants? a. yes because the energy of activation is negative in these cases. b. no because the products have higher potential energy which result in less stable molecules. c. no because the energy of activation is always lower in an endergonic reaction, which results in a less stable product. d. yes because the products have higher free energy and therefore require more energy to break bonds.arrow_forwardExplain the chemical structure of ATP. Why is it considered to be a modified nucleotide?arrow_forward
- Which of the following does not form part of the structure of ATP? a) deoxyribose b) adenine c) ribose d) phosphate groups e) All of the above form ATParrow_forwardwhat type of intermolecular forces exist between the side chains of each of the following pairs of amino acid: a. isoleucine and valine b. threonine and phenylalanine c. lys and glu d. arg and asparrow_forwardWhich of the following pairs of amino acids stabilizes a fold in a polypeptide chain through ionic interaction at physiological pH? A. cysteine and cysteine B. phenylalanine and valine C. glutamate and lysine D. serine and threoninearrow_forward
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