Protein Questions and answers:
The site of protein digestion is
(a) Gullet
(b) Stomach
(c) Small intestine
(d) Oral cavity
Protein are diverse in nature because of
(a) Complexity of amino acids
(b) Different arrangement of amino acids
(c) Different molecular nature of amino acids
(d) Different molecular weight of amino acids
Which of the following proteins acts as a hormone ?
(a) Trypsin
(b) Keratin
(c) Oxytocin
(d)Casein
The proteins which are insoluble in water are
(a) Fibrous proteins
(b) Globular proteins
(c) Both (a) and (b)
(d) None of these
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Irreversible precipitation of proteins is called
(a) Denaturation
(b) Hydrolysis
(c) Rearrangement
(d) Electrophoresis
Which of the following proteins stores oxygen in the muscles ?
(a) Pepsin
(b) Collagen
(c) Myoglobin
(d)Actin
The proteins with a prosthetic group are called
(a) Pseudo proteins
(b) Complex proteins
(c) Conjugated proteins
(d) Polypeptides
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Proteins are hydrolysed by enzymes into
(a) Dicarboxylic acids
(b) Hydroxy acids
(c) Amino acids
(d) Aromatic acids
Which of the following bonds determines the secondary structure of proteins ?
(a) Electrovalent bond
(b) Covalent bond
(c) Hydrogen bond
(d) Coordinate bond
Proteins when heated with conc. HNO3 give a yellow colour. This is
(a) Oxidising test
(b) Xanthoprotic test
(c) Hoppe’s test
(d) Acid-base test
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In which of the following proteins are absent
(a) Pancreatic juice
(b) Saliva
(c) Bile
(d) Intestinal juice
Ques. Which of the following bonds is responsible for the coiled structure of proteins ?
(a) Dipeptide bond
(b) Peptide bond
(c) Hydrogen bond
(d) Ionic bond
Trypsin is a digestive enzyme which occurs in mammals and digests
(a) Starch in buccal cavity in an alkaline medium
(b) Protein in stomach in an acidic medium
(c) Protein in duodenum in an acidic medium
(d) Protein in duodenum in an alkaline medium
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The exact sequence of events during digestion of protein is
(a) Proteins -> peptones -> acid metaproteins and peptides
(b) Proteins -> proteoses and peptones -> peptides -> amino acids
(c) Proteins -> acid metaproteins -> proteoses -> amino acids -> peptides
(d) Proteins -> primary proteins -> peptides -> amino acids
Protein is not present in :
(a) Nail
(b) Hair
(c) Wool
(d) DNA
Which one of the following enzymes initiates protein digestion
(a) Aminopeptidase
(b) Carboxypeptidase
(c) Trypsin
(d) Pepsin
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The smallest structural units of proteins are called
(a) Amino acids
(b) Peptides
(c) Proteoses
(d) Peptones
Ques. Which of the following part of the cell is the centre of protein synthesis?
(a) Plasma membrane
(b) Golgi bodies
(c) Ribosome
(d) Lysosome
Proteins are built up of
(a) Dicarboxylic acids
(b) Amino acids
(c) Alcohols
(d) Hydroxy acids
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Which level of protein structure is affected by DNA
(a) Primary structure
(b) Secondary structure
(c) Tertiary structure
(d) Quaternary structure
