All the following amino acids are non essential in mammals EXCEPT: a) Phenylalanine 2. Tryptophan is: c) Tyrosine d) glycine d) Aspartate a) Acidic amino acid b) Basic amino acid c). Aromatic amino acid d) mino ad 3.

Requirements:

All the following amino acids are non essential in mammals EXCEPT: a) Phenylalanine 2. Tryptophan is: c) Tyrosine d) glycine d) Aspartate a) Acidic amino acid b) Basic amino acid c). Aromatic amino acid d) mino ad 3. Which of the following is a dicarboxylic mono amino acid ? a) Phenylalanine b) Arginine c) Valinc dGlutamate 4. Glutathione is: 9)A tripeptide b) A porphoryin c) An aromatic amino acid d) A nucleoside 5. The protein present in hair & nails is: a Mucoprotein b) Metaloprotein c) Phosphoprotein dekatin 6. Denaturation of protein is characterized by all the followings EXCEPT: a) It may be reversible or irreversible d) It is caused by organic solventslete b) is accompanied by the change in the primary structure of protein c) It is accompanied by the loss of its native secondary & tertiary structure 7. Which of the following amino acid is not involved in protein structure ? a) phenylalanine b) arginine c) serine 4) Ornithine 8. regarding glutamic add, il PKa ofa-COOH =2, pka of side chain COOH – 4 & pKabla ami 10, so its P/ value will be:

a) 2 c) 6 d) 8 9. The primary structure of proteins is best described by: a) The total amino acid composition of protein d) The a-helical structure of the proteis-molecule b) The number & sequence of amino acids in the protein molecule c) The number of amino acid residues present in the protein molecules 10. Valine & Leucine are: a) Monoamino, dicarboxylic amino acids c) Diamino, monocarboxylic amino acids b) Branched chain amino acids d) Aromatic amino acids 11. Keratins are; a) chromoproteins b) Scleroprotein c) Globular proteins d) Derived 12.Denaturation of protein is characterized by all the following EXCEPT: a) It may be reversible or irreversible e) It is caused by organic solvents & detergents b) It may lead to destruction of the primary structure of protein c) It is accompanied by the loss of its native secondary & tertiary structure d) Denaturated proteins are easily digested by digestive proteolytic enzymes 13.During electrophoresis in a buffer PH=5, all the following amino acids will migrate cathode /-ve electrode) EXCEPT: a) Glycine (PI-6.7) c) Glutamic acid (PI-3.21 b). Arginine (PI-10) d) Lysine (PI=11)

e) Valine (7) 14.which of the following amino acids is not involved in proteins structure 7 a) Phenylalanine b) Proline chalanine d) Arginine c) S 15. Which one of the following correctly pairs an amino acid with a valid chemical characteristics 7 a) Glutamine : contain a hydroxyl gp in its side chain d) Serine : can form disulfide bond b) Cysteine, contain the smallest side chain e) Isoleucine : contains a branched side c) Glycine : contains an amide gp in its side chain 16. Which of the following statements about protein structure is correct? a) The a-helix is composed of more than one polypeptide chain d) B-pleated sheets exist only in the anti b) c. ontain proline e) enzymes are usually present in sepen c) the a-helix i stabill-ed by intramolecular hydrogen bonds 17.Glutathione is a tripeptide composed of: a) Aspartate, glycine and eysteine. C) Glutamine, cysteine and glycine. b) Glutamate, cysteine and glycine. D) Glutamine, cysteine and alanine. 18. Which one of the following proteins has a high content of sulfur-containing amim a) Collagen. b) Elastin c) Keratin.

d) Histones. 19.Protein denaturation involves the rupture of all the following bonds EXCEPT: a) Pepvide bond b) Hydrogen bond. c) Ionic bond. d) Disulfide bond 20. All the following amino acids are asymmetric EXCEPT: a) A) Serine. B) Glycine C) Valine D) Lysine 21.Write the ionic formula for the following aa at physiological PH: 1-alanine 2-glutamic acid 3-Lysine 4- Histadine 22.Each of the following amino acids contains an aromatic side chain EXCEPT: A) Tyrosine. B) Phenyl alanine. C) Histidine. D) Threonine. 23 Which of the following is a sulfur containing amino acid? A)Ornithine. B) Valine. C) Methionine. D) Aspargine. 24.The following amino acids contain branched side chains EXCEPTS A) Valine.

B) Lysine. C) Leucine. D) Isoleucine. 25.The amino acid that acts as a part of coenzyme is: A-B-alanine B- Histidine C- Aminobutyric acid Đ-Taurine 26.Which of the following is the isoelectric pH of lysine? (pKa a CooH=2;pka. ANH2=10; pka side chain NH2=9) A-6 B-5.5 C-9.5 D-12 27.At physiological pĦ which of the following amino acids carries a positive charge? A-Glutamate B- Aspartate C- Alanine D-Lysine

All the following amino acids are non essential in mammals EXCEPT: a) Phenylalanine 2. Tryptophan is: c) Tyrosine d) glycine d) Aspartate a) Acidic amino acid b) Basic amino acid c). Aromatic amino acid d) mino ad 3. Which of the following is a dicarboxylic mono amino acid ? a) Phenylalanine b) Arginine c) Valinc dGlutamate 4. Glutathione is: 9)A tripeptide b) A porphoryin c) An aromatic amino acid d) A nucleoside 5. The protein present in hair & nails is: a Mucoprotein b) Metaloprotein c) Phosphoprotein dekatin 6. Denaturation of protein is characterized by all the followings EXCEPT: a) It may be reversible or irreversible d) It is caused by organic solventslete b) is accompanied by the change in the primary structure of protein c) It is accompanied by the loss of its native secondary & tertiary structure 7. Which of the following amino acid is not involved in protein structure ? a) phenylalanine b) arginine c) serine 4) Ornithine 8. regarding glutamic add, il PKa ofa-COOH =2, pka of side chain COOH – 4 & pKabla ami 10, so its P/ value will be:

a) 2 c) 6 d) 8 9. The primary structure of proteins is best described by: a) The total amino acid composition of protein d) The a-helical structure of the proteis-molecule b) The number & sequence of amino acids in the protein molecule c) The number of amino acid residues present in the protein molecules 10. Valine & Leucine are: a) Monoamino, dicarboxylic amino acids c) Diamino, monocarboxylic amino acids b) Branched chain amino acids d) Aromatic amino acids 11. Keratins are; a) chromoproteins b) Scleroprotein c) Globular proteins d) Derived 12.Denaturation of protein is characterized by all the following EXCEPT: a) It may be reversible or irreversible e) It is caused by organic solvents & detergents b) It may lead to destruction of the primary structure of protein c) It is accompanied by the loss of its native secondary & tertiary structure d) Denaturated proteins are easily digested by digestive proteolytic enzymes 13.During electrophoresis in a buffer PH=5, all the following amino acids will migrate cathode /-ve electrode) EXCEPT: a) Glycine (PI-6.7) c) Glutamic acid (PI-3.21 b). Arginine (PI-10) d) Lysine (PI=11)

e) Valine (7) 14.which of the following amino acids is not involved in proteins structure 7 a) Phenylalanine b) Proline chalanine d) Arginine c) S 15. Which one of the following correctly pairs an amino acid with a valid chemical characteristics 7 a) Glutamine : contain a hydroxyl gp in its side chain d) Serine : can form disulfide bond b) Cysteine, contain the smallest side chain e) Isoleucine : contains a branched side c) Glycine : contains an amide gp in its side chain 16. Which of the following statements about protein structure is correct? a) The a-helix is composed of more than one polypeptide chain d) B-pleated sheets exist only in the anti b) c. ontain proline e) enzymes are usually present in sepen c) the a-helix i stabill-ed by intramolecular hydrogen bonds 17.Glutathione is a tripeptide composed of: a) Aspartate, glycine and eysteine. C) Glutamine, cysteine and glycine. b) Glutamate, cysteine and glycine. D) Glutamine, cysteine and alanine. 18. Which one of the following proteins has a high content of sulfur-containing amim a) Collagen. b) Elastin c) Keratin.

d) Histones. 19.Protein denaturation involves the rupture of all the following bonds EXCEPT: a) Pepvide bond b) Hydrogen bond. c) Ionic bond. d) Disulfide bond 20. All the following amino acids are asymmetric EXCEPT: a) A) Serine. B) Glycine C) Valine D) Lysine 21.Write the ionic formula for the following aa at physiological PH: 1-alanine 2-glutamic acid 3-Lysine 4- Histadine 22.Each of the following amino acids contains an aromatic side chain EXCEPT: A) Tyrosine. B) Phenyl alanine. C) Histidine. D) Threonine. 23 Which of the following is a sulfur containing amino acid? A)Ornithine. B) Valine. C) Methionine. D) Aspargine. 24.The following amino acids contain branched side chains EXCEPTS A) Valine.

B) Lysine. C) Leucine. D) Isoleucine. 25.The amino acid that acts as a part of coenzyme is: A-B-alanine B- Histidine C- Aminobutyric acid Đ-Taurine 26.Which of the following is the isoelectric pH of lysine? (pKa a CooH=2;pka. ANH2=10; pka side chain NH2=9) A-6 B-5.5 C-9.5 D-12 27.At physiological pĦ which of the following amino acids carries a positive charge? A-Glutamate B- Aspartate C- Alanine D-Lysine