Description : When egg albumin is heated till it is coagulated, the secondary and tertiary structures of the proteins are completely lost resulting in a mixture of randomly arranged (A) Dipeptide chains (B) Tripeptide chains (C) Polypeptide chains(D) All of these
Last Answer : Answer : C
Description : The end product of protein digestion in G.I.T. is (A) Dipeptide (B) Tripeptide (C) Polypeptide (D) Amino acid
Last Answer : Answer : D
Description : Thyrotropin releasing hormone is a (A) Dipeptide (B) Tripeptide (C) Octapeptide (D) Decapeptide
Last Answer : Answer : B
Description : Which of the following is a dipeptide? (A) Anserine (B) Glutathione (C) Glucagon (D) β -Lipoprotein
Last Answer : Answer : A
Description : In glutathione (a tripeptide) is present apart from Glutamic acid and cysteine: (A) Serine (B) Glycine (C) Leucine (D) Phenyl alanine
Description : A tripeptide functioning as an important reducing agent in the tissues is (A) Bradykinin (B) Kallidin (C) Tyrocidin (D) Glutathione
Description : Which of the following is a tripeptide? (A) Anserine (B) Oxytocin (C) Glutathione (D) Kallidin
Description : What is a dipeptide?
Last Answer : Two amino acids are combined to form a dipep- tide
Description : Met-enkephalin is a (A) Tripeptide (B) Pentapeptide (C) Octapeptide (D) Decapeptide
Description : Iodine is required in human body for (A) Formation of thyroxine (B) Formation of Glutathione (C) Formation of potassium iodide (D) Adrenalin
Description : Selenium is a constituent of (A) Glutathione reductase (B) Glutathione peroxidase (C) Catalase (D) Superoxide dismutase
Description : Selenium is a constituent of the enzyme: (A) Glutathione peroxidase (B) Homogentisate oxidase (C) Tyrosine hydroxylase (D) Phenylalanin hydroxylase
Description : Methemoglobin can be reduced to haemoglobin by (A) Removal of hydrogen (B) Vitamin C (C) Glutathione (D) Creatinine
Description : Glutathione is a constituent of (A) Leukotriene A4 (B) Thromboxane A1 (C) Leukotriene C4 (D) None of these
Description : Removal of BSP dye by the liver involves conjugation with (A) Thiosulphate (B) Glutamine (C) Cystein component of glutathione (D) UDP glucuronate
Description : Sulphur-containing amino acid is (A) Glutathione (B) Chondroitin sulphate (C) Homocysteine (D) Tryptophan
Description : A peptide which acts as potent smooth muscle hypotensive agent is (A) Glutathione (B) Bradykinin (C) Tryocidine (D) Gramicidin-s
Description : Reduced glutathione functions in R.B.Cs to (A) Produce NADPH (B) Reduce methemoglobin to hemoglobin (C) Produce NADH (D) Reduce oxidizing agents such as H2O2
Last Answer : D
Description : Dehydrogenation of succinic acid to fumaric acid requires the following hydrogen carrier: (A) NAD+ (B) NADP+ (C) flavoprotein (D) Glutathione
Last Answer : C
Description : Glutathione is made up of which amino acids?
Last Answer : Glutamic acid, cysteine and glycine.
Description : Nonsense codons bring about (A) Amino acid activation (B) Initiation of protein synthesis (C) Termination of protein synthesis (D) Elongation of polypeptide chains
Description : mRNA of prokaryotes can code for (A) More than one polypeptide (B) Only one polypeptide (C) Many exons and introns (D) Introns only
Description : A mRNA of eukaryotes can code for (A) Only one polypeptide (B) Two polypeptides (C) Three polypeptides (D) Five polypeptides
Description : Streptomycin prevents synthesis of polypeptide by (A) Inhibiting initiation process (B) Releasing premature polypeptide (C) Inhibiting peptidyl transferase activity (D) Inhibiting translocation
Description : In prokaryotes, chloramphenicol (A) Causes premature release of the polypeptide chain (B) Causes misreading of the mRNA (C) Depolymerises DNA (D) Inhibits peptidyl transferase activity
Description : Tetracylin prevents synthesis of polypeptide by (A) Blocking mRNA formation from DNA (B) Releasing peptides from mRNA-tRNA complex (C) Competing with mRNA for ribosomal binding sites (D) Preventing binding of aminoacyl tRNA
Description : The amino terminal of all polypeptide chain at the time of synthesis in E. coli is tagged to the amino acid residue: (A) Methionine (B) Serine (C) N-formyl methinine(D) N-formal serine
Description : The smallest unit of DNA capable of coding for the synthesis of a polypeptide is (A) Operon (B) Repressor gene (C) Cistron (D) Replicon
Description : __________ hormone is a single chain polypeptide having 32 amino acids with molecular weight of 3,600. (A) Testosteron (B) Thyroxine (C) Calcitonine (D) Vasopressin
Description : This pancreatic hormone increases the blood-sugar level: (A) Insulin (B) Glucagon (C) Pancreozymin (D) Pancreatic polypeptide
Description : All the following statements about epidermal growth factor are true except (A) It is a protein (B) It possess quaternary structure (C) Its receptor is made up of a single polypeptide chain (D) Its receptor possesses tyrosine kinase domain
Description : All the following statements about βendorphin are true except µ : (A) It is a polypeptide (B) Its precursor is pro-opio-melanocortin (C) Its receptors are represent in brain (D) Its action is blocked by morphine
Description : Gastrin is a polypeptide made up of (A) Five amino acids (B) Twelve amino acids (C) Seventeen amino acids (D) Twenty amino acids
Description : CRH is a polypeptide made up of (A) 39 amino acids (B) 41 amino acids (C) 51 amino acids (D) 84 amino acids
Description : ACTH is a polypeptide made up of (A) 39 amino acids (B) 41 amino acids (C) 51 amino acids (D) 84 amino acids
Description : Human growth hormone has (A) One polypeptide chain and one intra-chain disulphide bond (B) One polypeptide chain and two intra-chain disulphide bond (C) Two polypeptide chains joined by one disulphide bond (D) Two polypeptide chains joined by two disulphide bond
Description : The number of amino acids in single chain polypeptide glucagons is (A) 21 (B) 29 (C) 31 (D) 39
Description : The α-cells of pancreas islets produce (A) Insulin (B) Glucagon (C) Somatostatin (D) Pancreatic polypeptide
Description : β-cells of islet of langerhans of the pancreas secrete (A) Insulin (B) Glucagon (C) Somatostatin (D) Pancreatic polypeptide
Description : δ-Cells of islet of langerhans of pancreas produce (A) Pancreatic polypeptide (B) Pancreatic lipase (C) Somatostatin (D) Steapsin
Description : Adrenocorticotropic hormone (ACTH) is a single polypeptide containing (A) 25 amino acid (B) 39 amino acid (C) 49 amino acid (D) 52 amino acid 208 MCQs IN BIOCHEMISTRY
Description : N-terminal amino acids of a polypeptide are estimated by (A) Edmann reaction (B) Sanger’s reagent (C) Formaldehyde test (D) Ninhydrine reaction
Description : Insulin is oxidized to separate the protein molecule into its constituent polypeptide chains without affecting the other part of the molecule by the use of (A) Performic acid (B) Oxalic acid (C) Citric acid (D) Malic acid
Description : Isoenzymes for a given reaction (A) Have different spedificities (B) Have identical affinities for the same substrate (C) Exhibit different electrophoretic motilities (D) Contain similar ratios of different polypeptide chains
Description : The first amino acid incorporated in a polypeptide in a ribosome of a bacterium is (A) N formyl methionine (B) Methionine (C) Alamine (D) Glycine
Description : The first amino acid incorporated in a polypeptide in a ribosome of a human is (A) N formyl methionine (B) Methionine (C) Phenyl alanine (D) Hydroxy lysine
Description : Insulin is made up of (A) A single polypeptide chain having 51 amino acid residues (B) A single polypeptide chain having 84 amino acid residues (C) A-chain having 21 and B-chain having 30 amino acid residues (D) A-chain having 30 and B-chain having 21 amino acid residues
Description : The minimum number of polypeptide chains in an immunoglobulin is (A) Two (B) Four (C) Five (D) Six
Description : At the lowest energy level α-helix of polypeptide chain is stabilised (A) By hydrogen bonds formed between the H of peptide N and the carbonyl O of the residue (B) Disulphide bonds (C) Non polar bonds (D) Ester bonds
Description : Globular proteins have completely folded, coiled polypeptide chain and the axial ratio (ratio of length to breadth) is (A) Less than 10 and generally not greater than 3–4 (B) Generally 10 (C) Greater than 10 and generally 20 (D) Greater than 10