Protein Questions and answers:
Ques. The site of protein digestion is
(a) Gullet
(b) Stomach
(c) Small intestine
(d) Oral cavity
Ques. Which of the following proteins acts as a hormone ?
(a) Trypsin
(b) Keratin
(c) Oxytocin
(d)Casein
Ques. 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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Ques. Irreversible precipitation of proteins is called
(a) Denaturation
(b) Hydrolysis
(c) Rearrangement
(d) Electrophoresis
Ques. Which of the following proteins stores oxygen in the muscles ?
(a) Pepsin
(b) Collagen
(c) Myoglobin
(d)Actin
Ques. The proteins with a prosthetic group are called
(a) Pseudo proteins
(b) Complex proteins
(c) Conjugated proteins
(d) Polypeptides
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Ques. Proteins are hydrolysed by enzymes into
(a) Dicarboxylic acids
(b) Hydroxy acids
(c) Amino acids
(d) Aromatic acids
Ques. Which of the following bonds determines the secondary structure of proteins ?
(a) Electrovalent bond
(b) Covalent bond
(c) Hydrogen bond
(d) Coordinate bond
Ques. 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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Ques. 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
Ques. 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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Ques. 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
Ques. Protein is not present in :
(a) Nail
(b) Hair
(c) Wool
(d) DNA
Ques. Which one of the following enzymes initiates protein digestion
(a) Aminopeptidase
(b) Carboxypeptidase
(c) Trypsin
(d) Pepsin
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Ques. 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
Ques. Proteins are built up of
(a) Dicarboxylic acids
(b) Amino acids
(c) Alcohols
(d) Hydroxy acids
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Ques. Which level of protein structure is affected by DNA
(a) Primary structure
(b) Secondary structure
(c) Tertiary structure
(d) Quaternary structure
What is Protein Synthesis?
Protein synthesis is a core biological process that occurs inside cells. It balances out the depletion of cellular proteins by producing new ones. Proteins perform many critical functions in our bodies, and they include enzymes, structural proteins, hormones, and many other functions. It is an essential part of the body.
During protein synthesis, a chain of amino acids is synthesized. Then, these amino acids are linked together and released into a cell. The protein synthesis product is then modified for a specific purpose within the cell. Some examples of this process include the coding of eye color and hair color. Once the chain is complete, the ribosome separates into its subunits and the protein is ready for use. The process of protein synthesis happens in many cells in the body at once, and a living cell can produce hundreds of proteins per second.
Protein synthesis begins with the splitting of DNA into two. The first half of the new sequence is transferred into RNA, while the second half of the mRNA is detached from DNA. The end result is a polypeptide chain, which can be functional or nonfunctional depending on the specific type of protein. Proteins can undergo several additional processes to make them function, including peptide bonding and Golgi body modifications.
