The post Introduction to Protein Metabolism: Digestion and Absorption and MCQs for GPAT, NEET, CSIR NET, SSC appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
]]>Digestion of proteins
Proteolytic enzymes which are produced by the stomach, small intestine and pancreas perform the breakdown of proteins into its amino acids. Digestion in mouth of proteins does not occur, protein digestion starts from stomach
1. Digestion in stomach
In stomach, the protein diet stimulate the secretion of gastrin. The gastrin in turn stimulates the secretion of HCL, pepsin and renin. These three works for the digestion of proteins.
2. Digestion in small intestine
Digestion in small intestine occur in two ways:
Proenzyme (inactive form) | Enzyme (active form) |
Trypsinogen | Trypsin |
Chymo-trypsinogen | Chymotrypsin |
Pro-elastase | Elastase |
Absorption of Proteins
The below diagram explains the transport of L-amino acids across the intestinal membrane.
1. Where do digestion of protein takes place?
A. Mouth
B. Small intestine
C. Stomach
D. Both b and C
E. All of the above
2. What stimulate the secretion of gastrin?
A. Pepsin
B. Protein diet
C. Lipid diet
D. Both A and B
3. What is the daily protein requirement of an adult man?
A. 50-70g
B. 180-200g
C. 70-100g
D. 20-30g
4. Pepsin breaks the peptide bond of which type of protein?
A. Aromatic amino acid
B. Basic amino acid
C. Acidic amino acid
D. Both A and C
5. Match the following-
A. Dipeptidase 1. Results in each amino acid
B. Trypsin 2. Hydrolyze the peptide bond
C. Carboxy peptidase 3. Breaks the C-terminal of peptide bond
D. Hydrochloric acid 4. Denature of protein
6. Is renin and rennin same? If no, why?
A. Both are same
B. No, renin regulates water balance and rennin function is to clot milk
C. No, rennin regulates water balance and renin function is to clot milk
D. No, Rennin regulates BP and renin regulates electrolyte balance
7. Which of the following is pancreatic enzyme?
A. Aminopeptidase
B. Elastase
C. Tyrpsin
D. All of the above
8. Which of the following statement is NOT true?
A. Exopeptidase consist of elastase, trypsin etc
B. Amino acids are more stable than imino acid
C. Carboxypeptidase is calcium dependent enzyme
D. Dipeptidase is cobalt and magnesium dependent enzyme
9. What is the inactive form of elastase?
A. Pro elastase
B. Elastinogen
C. Elastin
D. none of the above
10. Through which vein, amino acids after digestion reaches the liver?
A. Renal vein
B. Hepatic portal vein
C. Carotid vein
D. none of the above
11. What is the inactive form of chymotrypsin?
A. Pro chymotrypsin
B. Chymotrypsinogen
C. Chymotrysinase
D. None of the above
12. What is the function of chymotrypsin?
A. Break peptide bond of aromatic amino acid
B. Break peptide bond of aliphatic amino acid
C. Break peptide bond of acidic amino acid
D. Break peptide bond of basic amino acid
13. Aminopeptidase breaks which terminal of peptide bond?
A. C-terminal
B. N-terminal
C. D-terminal
D. All of the above
14. Which of the following breaks the C-terminal of peptide bond?
A. Aminopeptidase
B. Dipeptidase
C. Trypsin
D. None of the above
15. Which of the following is a zinc containing enzyme?
A. Pepsin
B. Trypsin
C. Carboxypeptidase
D. Elastase
ANSWERS:-
1. Both B and C
2. Protein diet
3. 70-100g
4. Both A and C
5. a – 1 b – 2 c – 3 d – 4
6.No, renin regulates water balance and rennin function is to clot milk
7. All of the above
8. Exopeptidase consist of elastase, trypsin etc
9. Pro elastase
10. Hepatic portal vein
11. Chymotrypsinogen
12. Break peptide bond of aromatic amino acid
13. N-terminal
14. None of the above
15. Carboxypeptidase
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REFERENCE:- Pankaja Naik- Biochemistry; 4th edition; page no:- 263-265.
The post Introduction to Protein Metabolism: Digestion and Absorption and MCQs for GPAT, NEET, CSIR NET, SSC appeared first on Gpatindia: Pharmacy Jobs, Admissions, Scholarships, Conference,Grants, Exam Alerts.
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