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Which of the following is a correct structure for L-valine? Which of the following is a correct structure for L-valine? A) I B) II C) III D) IV E) V


A) I
B) II
C) III
D) IV
E) V

Correct Answer

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Which amino acid is produced from the following reaction sequence? Which amino acid is produced from the following reaction sequence? A) alanine B) valine C) leucine D) isoleucine E) none of these


A) alanine
B) valine
C) leucine
D) isoleucine
E) none of these

Correct Answer

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Chymotrypsin,a digestive enzyme,catalyzes the hydrolysis of the peptide bond at the carboxyl end of which of the following amino acids? Chymotrypsin,a digestive enzyme,catalyzes the hydrolysis of the peptide bond at the carboxyl end of which of the following amino acids? A) phenylalanine B) tyrosine C) tryptophan D) histidine E) A,B & C


A) phenylalanine
B) tyrosine
C) tryptophan
D) histidine
E) A,B & C

Correct Answer

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Which of the following amino acids will migrate towards the anode at pH 7? Glycine: pI=6.0 Lysine: pI=9.7

Correct Answer

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Glycine

Which of the following dipeptides is formed when alanine and valine are reacted in the presence of dicyclohexylcarbodiimide (DCC) ?


A) Ala-Val
B) Val-Ala
C) Ala-Ala
D) Val-Val
E) all of these

Correct Answer

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Which of the following is a predominant form of serine at physiological pH? Which of the following is a predominant form of serine at physiological pH? A) I B) II C) III D) IV E) V


A) I
B) II
C) III
D) IV
E) V

Correct Answer

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Which amino acid is produced from the following reaction sequence? Which amino acid is produced from the following reaction sequence? A) alanine B) valine C) leucine D) isoleucine E) none of these


A) alanine
B) valine
C) leucine
D) isoleucine
E) none of these

Correct Answer

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B

Which of the following tetrapeptides is not cleaved by trypsin?


A) Gly-Lys-Cys-Phe
B) Cys-Ala-Arg-Ser
C) Gly-Ser-Ile-Lys
D) Ala-Lys-Tyr-Arg
E) none of these

Correct Answer

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Which of the following is a predominant form of arginine at pH 2? Which of the following is a predominant form of arginine at pH 2? A) I B) II C) III D) IV E) V


A) I
B) II
C) III
D) IV
E) V

Correct Answer

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Provide the steps necessary to prepare the tetrapeptide Thr-Val-Ile-Met using the Merrifield synthesis.

Correct Answer

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Which of the following tetrapeptides is not cleaved by chymotrypsin?


A) Gly-Lys-Cys-Trp
B) Cys-Tyr-Arg-Phe
C) Phe-Ser-Ile-Lys
D) Ala-Trp-Tyr-Arg
E) none of these

Correct Answer

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Which amino acid is produced from the following reaction? Which amino acid is produced from the following reaction? A) methionine B) serine C) cysteine D) lysine E) none of these


A) methionine
B) serine
C) cysteine
D) lysine
E) none of these

Correct Answer

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Trypsin,a digestive enzyme,catalyzes the hydrolysis of the peptide bond at the carboxyl end of which of the following amino acids? Trypsin,a digestive enzyme,catalyzes the hydrolysis of the peptide bond at the carboxyl end of which of the following amino acids? A) arginine B) lysine C) histidine D) tryptophan E) A & B


A) arginine
B) lysine
C) histidine
D) tryptophan
E) A & B

Correct Answer

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Which of the following dipeptides is formed when tyrosine is treated with (Boc) 2O and proline is treated with benzyl alcohol first and then reacted in the presence of DCC followed by treatment with trifluoroacetic acid and aqueous NaOH?


A) Tyr-Pro
B) Pro-Tyr
C) Pro-Pro
D) Tyr-Tyr
E) all of these

Correct Answer

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Which of the following alkenes is used to prepare isoleucine using an asymmetric catalytic hydrogenation? Which of the following alkenes is used to prepare isoleucine using an asymmetric catalytic hydrogenation? A) I B) II C) III D) IV E) none of these Which of the following alkenes is used to prepare isoleucine using an asymmetric catalytic hydrogenation? A) I B) II C) III D) IV E) none of these


A) I
B) II
C) III
D) IV
E) none of these

Correct Answer

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A

Which of the following is a predominant form of aspartic acid at pH 1? Which of the following is a predominant form of aspartic acid at pH 1? A) I B) II C) III D) IV E) V


A) I
B) II
C) III
D) IV
E) V

Correct Answer

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Which of the following amino acids have a pI around pH 10? Which of the following amino acids have a pI around pH 10? A) I B) II C) III D) IV E) V


A) I
B) II
C) III
D) IV
E) V

Correct Answer

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Which amino acid is produced from the following reaction? Which amino acid is produced from the following reaction? A) methionine B) serine C) cysteine D) lysine E) none of these


A) methionine
B) serine
C) cysteine
D) lysine
E) none of these

Correct Answer

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Which of the following is the correct sequence of the tetrapeptide that is formed by the following reaction sequence? Which of the following is the correct sequence of the tetrapeptide that is formed by the following reaction sequence? A) Cys-Ala-Phe-Ser B) Cys-Phe-Ala-Ser C) Ser-Ala-Phe-Cys D) Ser-Phe-Ala-Cys E) none of these


A) Cys-Ala-Phe-Ser
B) Cys-Phe-Ala-Ser
C) Ser-Ala-Phe-Cys
D) Ser-Phe-Ala-Cys
E) none of these

Correct Answer

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When more than fifty amino acids are connected to each other,they form _________.


A) a tripeptide
B) a protein
C) a polypeptide
D) a tetrapeptide
E) none of these

Correct Answer

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Showing 1 - 20 of 99

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