Online Quiz 1 PDF

Which of the following is a nonessential amino acid? Question 1Answer a.Valine b.Arginine c.Leucine d.Tyrosine Which of the following is an aspartate-derived amino acid? Question 2Answer Valine Cysteine Isoleucine Leucine Which of the following is a nonpolar amino acid? Ques...

Which of the following is a nonessential amino acid? Question 1Answer a.Valine b.Arginine c.Leucine d.Tyrosine Which of the following is an aspartate-derived amino acid? Question 2Answer Valine Cysteine Isoleucine Leucine Which of the following is a nonpolar amino acid? Question 4Answer Histidine Valine Glutamine Lysine The precursors of urea in liver are.............. Question 5Answer Ammonia and Asp Gln and Asn Gln and Asp Ammonia and Glu The enzyme that catalyzes the conversion of Asp to Asn has two substrates which are..... NH4+ and Glu NH4+ and Asp Gln and Asp Gln and Glu ADP is an allosteric activator for the catabolic direction of GDH TRUE Which of the following is present in elastin? 6-N-Methyllysine 4-Hydroxyproline 5-Hydroxylysine Desmosine The origin of acetylcholine neurotransmitter is amino acid............ serine The histidine is converted to histamine by.................... reaction Transamination decarboxylation Hydrolytic deamination Oxidative deamination The precursors of cysteine are.......... Question 11Answer Methionine and Alanine Homoserine and Methionine Homocysteine and Alanine Methionine and Serine he assimilation of nitrogen in plants in dark is dependent on enzyme............ Question 13Answer GS GOGAT AS GDH The enzyme that catalyzes the following reaction has an EC number starting with Question 14Answer 6 4 3 2 Which of the following is a hormonal protein? Question 15Answer Epinephrine Insulin Estrogen Vasopressin PKU is a genetic disorder due to deficiency of.............. Question 16Answer PAH and/or dihydrobiopterin reductase PAH Low tyrosine intake The carbon skeleton origin of serine amino acid is Question 17Answer α-ketoglutarate Oxaloacetate Pyruvate 3-phosphoglycerate Which of the following is an acidic amino acid? Question 18Answer Tyrosine Proline Aspartic acid Lysine The albinism is a genetic disorder due to.................. Question 19Answer PAH deficiency Tyrosinase deficiency Low tyrosine intake DOPA decarboxylase deficiency The protein insulin consists of two polypeptides termed the A and B chains. Insulins from diff erent organisms have been isolated and sequenced. Human and duck insulins have the same amino acid sequence with the exception of six amino acid residues, as shown below. Is the pI of human insulin lower than or higher than that of duck insulin? Question 20Answer Lower Higher Which of the following is an achiral amino acid? Question 21Answer Glycine Proline Ornithine Serine The following reaction follows which type of amino acid transformations? Question 22Answer Oxidative deamination Amidation Reductive amination Transamination Which of the following is a basic amino acid? Question 23Answer Proline Aspartic acid Tyrosine Lysine Which of the following is a nonpolar amino acid? Question 24Answer Glutamine Lysine Histidine Leucine The precursor of methionine biosynthesis is.................. Question 25Answer Cysteine and Threonine Cysteine and Serine Cysteine and Aspartic Cysteine and Glutamic Which of the following amino acids is synthesized via shikimate pathway? Question 26Answer Tryptophan Isoleucine Histidine Lysine he origin of GABA neurotransmitter is amino acid............ Glutamic Which of the following is an essential amino acid? Question 28Answer Arginine Serine Tyrosine Leucine The enzyme that catalyzes the following reaction has an EC number starting with........... 6 2 1 4 The substrate for the synthesis of epinephrine and norepinephrine is tryptophan which is hydroxylated to 3,4-dihydroxyphenylalanine (DOPA) by tetrahydrobiopterin-requiring tryptophan hydroxylase. True False Which of the following is a conditionally essential amino acid Arginine Leucine Serine Lysine Find the pI of this peptide: Glu–His–Trp–Ser–Gly–Leu–Arg–Pro–Gly Ans : 7.8 Which of the following substrates has the lower Km value for enzyme asparagine synthetase? Question 36Answer Glutamine Ammonium Oxaloacetic Glutamic Which of the following is a nonpolar amino acid? Question 34Answer Phenylalanine Histidine Glutamine Lysine Which of the following is a storage protein? Question 37Answer Hemoglobin Collagen Ovalbumin Keratin Which of the following is a nonproteinogenic amino acid? Question 38Answer Desmosine γ-Carboxyglutamate Citrulline Selenocysteine If the pka values for ionizable groups in amino acid histidine are as following: pka1= 1.82, pka2=9.17 and pkR=6 Ans GTP is an allosteric inhibitor for the catabolic direction of GDH true false The amino acid that has the main route for deamination of most of amino acids is Question 42Answer Gln Asp Ala Glu The conversion of glutamine to glutamate is catalyzed by enzyme........ Question 43Answer GOGAT GDH GS AspAT GDH is the principal route for nitrogen assimilation in plant true false he oxidative deamination of amino acids is catalyzed by.................. Question 46Answer GPT GDH GOT GS Which of the following is a contractile protein? Question 47Answer Silk Fibroin Elastin Actin Myoglobin The nomenclature of the following peptide (One letter abbreviation) is..... MFK TYL SPL CPK Mixtures of amino acids can be analyzed by first separating the mixture into its components through ion exchange chromatography. Amino acids placed on a cation exchange resin containing sulfonate (-SO3-) groups flow down the column at different rates because of two factors that influence their movement: (1) ionic attraction between the sulfonate residues on the column and positively charged functional groups on the amino acids (2) hydrophobic interactions between amino acid side chains and the strongly hydrophobic backbone of the polystyrene resin. For each pair of amino acids listed, determine which will be eluted first from the cation-exchange column by a pH 7.0 buffer Amino Acid pka1 pka2 pkaR Asp 2.09 9.82 3.86 Lys 2.18 8.95 10.79 Arg 2.17 9.04 12.48 Met 2.28 9.21 Glu 2.19 9.67 4.25 Val 2.32 9.62 Gly 2.34 9.6 Leu 2.36 9.6 Ser 2.21 9.15 Ala 2.34 9.69 Your answer is correct. The correct answer is: Glu and Val → Glu, Gly and Leu → Gly, Arg and Met → Met, Ser and Ala → Ser, Asp and Lys → Asp Which of the following is a polar uncharged amino acid? Arginine Proline Asparagine Aspartic acid The serine is a substrate for hydroxymethyl transferase to form..... Question 51Answer Alanine Glycine Threonine Glyoxalate Which of the following is a nonpolar amino acid? Question 52Answer Histidine Glutamine Methionine Lysine A patient with high blood ammonia levels, elevated glutamine and decreased arginine relative to normal levels. These findings may be attributed to.... Question 53Answer High activity of GS Deficiency in one of the urea cycle enzymes High activity of arginase Low excretion of urea in urine due to kidney dysfunction he carbon skeleton of Leucine amino acid is originated from...... Question 54Answer Oxaloacetate 3-Phosphoglycerate Pyrvate α-ketoglutarate Threonine is biosynthesized in animals from aspartic acid true false The following reaction is catalyzed by which enzyme? Glutamate dehydrogenase (GDH) Aspartate aminotransferase GPT Alanine aminotransferase The origin of dopamine neurotransmitter is amino acid........ Tyrosine.... relationship between the Titration Curve and the Acid-Base Properties of Glycine A 100 mL solution of 0.1 M glycine at pH 1.72 was titrated with 2 M NaOH solution. The pH was monitored and the results were plotted as shown in the graph. The key points in the titration are designated (I) to (V). For each of the statements (a) to (o), identify the appropriate key point in the titration (Match the correct statement with its corresponding stage in the titration curve). The average net charge of glycine is -1. → V, Half of the amino groups are ionized. → IV, Glycine is present predominantly as a 50:50 mixture of+H3N-CH2-COOH and + H3N-CH2-COO- → II, The average net charge of glycine is zero. → III, Glycine has its maximum buffering capacity → II and IV, The predominant species is +H3N-CH2-COO- → III, Glycine is completely titrated (second equivalence point). → V, Glycine is present predominantly as the species +H3N-CH2-COOH → I, The pH is equal to the pKa of the carboxyl group → II An amino acid is degraded to form ketone bodies or krebs cycle intermediates..... Valine Isoleucine Leucine Methionine The precursor of proline amino acid is.................. Arginine Glutamate Aspartate Lysine The following reaction is catalyzed by...... Glutamine synthetase Glutamine synthase Glutaminase Glutamate amidase The origin of serotonin neurotransmitter is amino acid......... Tryptophan...