Description : Which of the following amino acids has an aromatic R group? (a) Serine (b) Cysteine (c) Asparagine (d) Tyrosine
Last Answer : Tyrosine
Description : Which of the following amino acids has an aliphatic R group? (a) Serine (b) Cysteine (c) Asparagine (d) Leucine
Last Answer : Leucine
Description : Branched chain amino acids are (A) Cysteine and cystine (B) Tyrosine and Tryptophan (C) Glycine and Serine (D) Valine, Leucine and Isoleucine
Last Answer : Answer : D
Description : .Khorana first deciphered the triplet codons of (a) serine and isoleucine (b) cysteine and valine (c) tyrosine and tryptophan (d) phenylalanine and methinonine.
Last Answer : (a) serine and isoleucine
Description : Khorana first deciphered the triplet codons of (a) serine and isoleucine (b) cysteine and valine (c) tyrosine and tryptophan (d) phenylalanine and methinonine
Last Answer : (b) cysteine and valine
Description : The amino acid with a nonpolar side chain is (A) Serine (B) Valine (C) Asparagine (D) Threonine
Last Answer : Answer : B
Description : In the A chain of insulin molecule the Cterminal amino acid is (A) Asparagine (B) Threonine (C) Valine (D) Tyrosine
Last Answer : Answer : A
Description : An amino acid that does not form an αhelix is (A) Asparagine (B) Tyrosine (C) Tryptophan (D) Proline
Description : An essential amino acid in man is (A) Proline (B) Threonine (C) Asparagine (D) Tyrosine
Description : Which of the following is the simplest amino acid? (a) Alanine (b) Asparagine (c) Glycine (d) Tyrosine
Last Answer : (c) Glycine
Description : In E. coli the chain initiating amino acid in protein synthesis is (A) N-formyl methionine(B) Methionine (C) Serine (D) Cysteine
Description : The active site of an enzyme is formed by a few of the enzymes: (A) R groups of the amino acids (B) Amino groups of the amino acids (C) Carboxyl group of the amino acids (D) Exposed sulfur bonds
Last Answer : Answer : C
Description : Which among the following is an essential amino acid? (A) Cysteine (B) Leucine (C) Tyrosine (D) Aspartic acid
Description : Which of the following amino acid has been shown as one of the active site of phosphoglucomutase? (A) Lysine (B) Tyrosine (C) Serine (D) Histidine
Description : Activation or inactivation of certain key regulatory enzymes is accomplished by covalent modification of the amino acid: (A) Tyrosine (B) Phenylalanine (C) Lysine (D) Serine
Description : Small amount of urinary oxalates is contributed by the amino acid: (A) Glycine (B) Tyrosine (C) Alanine (D) Serine
Description : An essential amino acid in man is (A) Aspartate (B) Tyrosine (C) Methionine (D) Serine
Description : Glycine is a unique amino acid because it (a) has no chiral carbon (b) has a sulfur containing R group (c) cannot form a peptide bond (d) is an essential amino acid
Last Answer : has no chiral carbon
Description : For synthesis of CTP and UTP, the amino group comes from (A) Amide group of Asparagine (B) Amide group of glutamine (C) α-Amino group of glutamine (D) α-Amino group of glutamate
Description : All the following amino acids are nonessential except (A) Alanine (B) Histidine (C) Cysteine (D) Proline
Description : All the following are sulphur containing amino acids found in proteins except (A) Cysteine (B) Cystine (C) Methionine (D) Threonine
Description : For the synthesis of amino acids cysteine, cystine and methionine the element required is a. Sulphur b. Oxygen c. Nitrogen d. None of these
Last Answer : Ans: D
Last Answer : (D) Threonine
Description : In glutathione (a tripeptide) is present apart from Glutamic acid and cysteine: (A) Serine (B) Glycine (C) Leucine (D) Phenyl alanine
Description : Methionine is synthesized in human body from (A) Cysteine and homoserine (B) Homocysteine and serine (C) Cysteine and serine (D) None of these
Description : Cysteine can be synthesized from methionine and (A) Serine (B) Homoserine (C) Homocysteine (D) Threonine
Description : Most amino acids are substrates for transamination except (A) Alanine (B) Threonine (C) Serine (D) Valine
Description : All amino acids are optically active except (A) Glycine (B) Serine (C) Threonine (D) Tryptophan
Description : Most of the ammonia released from L-αamino acids reflects the coupled action of transaminase and (A) L-glutamate dehydrogenase (B) L-amino acid oxidase (C) Histidase (D) Serine dehydratase
Description : Hopkins-Cole test is for identification of (A) Tyrosine (B) Tryptophan (C) Arginine (D) Cysteine
Description : Sakaguchi’s reaction is specific for (A) Tyrosine (B) Proline (C) Arginine (D) Cysteine
Description : Which of the following amino acids produce a vasoconstrictor on decarboxylation? (A) Histidine (B) Tyrosine (C) Threonine (D) Arginine
Description : Side chains of all following amino acids contain aromatic rings except (A) Phenyl alanine (B) Alanine (C) Tyrosine (D) Tryptophan
Description : Side chains of all amino acids contain aromatic rings except (A) Pheynl alanine (B) Alanine (C) Tyrosine (D) Tryptophan
Description : Skeletal muscle breakdown produces predominantly liberation of which two amino acids? A. Lysine. B. Tyrosine. C. Alanine. D. Glutamine. E. Arginine.
Last Answer : Answer: CD DISCUSSION: Alanine is released from skeletal muscle and extracted by the liver, where it is converted to new glucose. Glutamine is also released from muscle and participates in ... these two amino acids account for approximately two thirds of the nitrogen released from skeletal muscle
Description : Serotonin is synthesised from (A) Serine (B) Phenylalanine (C) Tyrosine (D) Tryptophan
Description : Name the Sulfur containing amino acids.
Last Answer : Cysteine and methionine.
Description : Which of the following amino acids has a heterocyclic R group? (a) Glycine (b) Threonine (c) Proline (d) Aspartic acid
Last Answer : Proline
Description : All of the following statements about aspartate are true except (A) It is non-essential amino acid (B) It is a dicarboxylic amino acid (C) It can be synthesized from pyruvate and glutamate (D) It can be converted into asparagine
Description : Sulphur containing amino acid is (A) Methionine (B) Leucine (C) Valine (D) Asparagine
Last Answer : (A) Methionine
Description : Toxicity of mercury and cadmium is being reversed by protein mainly using the amino acid residue ____________. (a) Cysteine (b) Glycine (c) Lewcine (d) Lysine
Last Answer : (a) Cysteine
Description : The active site of an enzyme is formed by (A) R group of amino acids (B) NH2 group of amino acids (C) CO group of amino acids (D) Sulphur bonds which are exposed
Description : Amino acids excepting histidine are not good buffering agents in cell because (A) They exist as zwitter ions (B) Their pk and not in the physiological pH of a cell (C) Only Histidine has pk of its R group at 6.0 unlike the others which have at a different pH (D) None of these
Description : Carbon skeleton of the following amino acid can serve as a substance for gluconeogenesis (A) Cysteine (B) Aspartate (C) Glutamate (D) All of these
Description : Which of the amino acid produces a vasodilator on decarboxylation? (A) Glutamin acid (B) Histidine (C) Ornithine (D) Cysteine
Description : In nitroprusside test, amino acid cysteine produces a: (A) Red colour (B) Blue colour (C) Yellow colour (D) Purple colour
Description : Which amino acid is present at 6th position of β-chain of Hbs instead of glutamate in HbA? (A) Cysteine (B) Valine (C) Aspartate (D) Glutamate
Description : The limiting amino acid in wheat is (A) Leucine (B) Lysine (C) Cysteine (D) Methionine
Description : The limiting amino acid of fish proteins is (A) Tryptophan (B) Cysteine (C) Lysine (D) Threonine