Which of the following statements regarding proline is INCORRECT? It is an imino acid Maintains healthy myocardium It helps strengthen joints Free proline can be hydroxylated to hydroxyproline 2.Which of the following compounds contributed to the two nitrogen atoms in urea ? Ammonia and glutamate Ornithine and aspartate Ammonia and alanine Glutamine and glutamate
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- Which of the following statements regarding proline is INCORRECT?
- It is an imino acid
- Maintains healthy myocardium
- It helps strengthen joints
- Free proline can be hydroxylated to hydroxyproline
2.Which of the following compounds contributed to the two nitrogen atoms in urea ?
- Ammonia and glutamate
- Ornithine and aspartate
- Ammonia and alanine
- Glutamine and glutamate
3. Which of following statements about hydroxyproline is INCORRECT?
- There is no codon for hydroxyproline.
- It is present in large amounts in collagen.
- Hydroxylation of proline residues is catalysed by a dioxygenase.
- Free proline cannot be hydroxylated to hydroxyproline.
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- Which of the following statements is not true about the catalytic triad in chymotrypsin? Group of answer choices the side chain of the serine 195 is hydrogen bonded to the imidazole ring of histidine the -NH group of the imidazole ring of histidine is hydrogen bonded to the carboxylate group of aspartate 102 the histidine residue serves to position the aspartate 102 side chain and to polarize its carboxylate group so that it is poised for deprotonation histidine acts as a general base catalyst none of theseUnbranched homopolymer of N-acetyl glucosamine is : 1.Cellulose 2.Chitin 3.Curcumin 4.Concanavalin AThe peptide CMYLES is reacted with phenylisothiocyanate under basic conditions followed by incubation with anhydrous trifluoroacetic acid. What are the products of this reaction? PTH-CMYLES Thiazolinone derivative of cysteine, MYLES O PTH-C, PTH-M, PTH-Y, PTH-L, PTH-E, PTH-S PTH-C, MYLES PTH-S, CMYLE
- a-Keto acids other than a-ketoglutarate can accept the amino group from pyridoxamine in enzyme-catalyzed transamination reactions. What amino acids are formed when the following a-keto acids accept the amino group?O OO O Opyruvate oxaloacetateA pentapeptide was found to have the composition Ala Arg Gly Pro Trp. Reaction of the pentapeptide with Sanger’s reagent, followed by hydrolysis, gave the DNP derivative of proline. Treatment of the pentapeptide with carboxypeptidase initially produced alanine. Treatment of the pentapeptide with trypsin gave a tetrapeptide which, when treated with chymotrypsin, produced a tripeptide. What is the sequence of the pentapeptide? (note: trypsin cleaves after basic amino acids) *A mutant form of polypeptide hormone angiotensin II has the amino acidcomposition (Asp, Arg, Ile, Met, Phe, Pro, Tyr, Val)The following observations are made:• Trypsin yields a dipeptide containing Asp and Arg and a hexapeptide withall the rest.• Cyanogen bromide cleavage yields a dipeptide containing Phe and Proand a hexapeptide containing all the others.• Chymotrypsin cleaves the hormone into two tetrapeptides, of composition (Asp, Arg, Tyr, Val) and (Ile, Met, Phe, Pro)• The dipeptide of composition (Pro, Phe) cannot be cleaved by either chymotrypsin or carboxypeptidase.What is the sequence of angiotensin II?
- The formation of thymidylate is typically coupled with the synthesis of which amino acid? O Cysteine Glutamate Alanine Serine O Glycine O Glutaminehelp with filling in the blanks The amino acid [alanine/aspartate/glutamate] can be transaminated to a- ketoglutarate, the amino acid [alanine/aspartate/glutamate] can be transaminated to pyruvate, and the amino acid [alanine/aspartate/glutamate] can be transaminated to oxaloacetate. As a result, all three amino acids are considered [glucogenic/ketogenic/metagenic]. The carbon of urea comes directly from [carbon dioxide/a-carbon of an amino acid/glucose]. The nitrogen atoms in urea come from [ammonia/DNA/pyruvate] and [aspartate/glutamate/alanine] directly.Conversion of amino acid nitrogen into urea by the liver for excretion normally involves all the following enzyme activities EXCEPT O Ornithine transcarbamoylase Carbamoyl phosphate synthetase II Glutamate dehydrogenase Arginase Which of the following statements about the
- A mutant form of polypeptide hormone angiotensin II has the amino acid composition (Asp, Arg, Ile, Met, Phe, Pro, Tyr, Val) The following observations are made: Trypsin yields a dipeptide containing Asp and Arg, and a hexapeptide with all the rest. • Cyanogen bromide cleavage yields a dipeptide containing Phe and Pro, and a hexapeptide containing all the others. • Chymotrypsin cleaves the hormone into two tetrapeptides, of composition (Asp, Arg, Tyr, Val) and (Ile, Met, Phe, Pro) • The dipeptide of composition (Pro, Phe) cannot be cleaved by either chymotrypsin or carboxypeptidase. What is the sequence of angiotensin II?D-Gluconic acid is formed from D-Glucoge Select one:a. By substitutonb. By oxydationc. By esterificationd. By reductionAll the following amino acids produce an intermediate of the TCA cycle except Isoleucine Leucine Valine Proline