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Final exam for all Carbohydrate and Nitrogen lectures.
1. Which of the following digestive enzymes pairs can break peptide bonds at either terminal end of a polypeptide?
A. Trypsin&chymotrypsin
B. Elastase&collagenase
C. Aminopeptidase and carboxypeptidase
D. Dipeptidase&tripeptidase
E. Enterokinase and Phospholipase A
2. Which of the following enzymes pairs can perform autocatalysis once they are activated?
A. Pepsin&trypsin
B. Aminopeptidase&carboxypeptidase
C. Elastase&collagenase
D. Dipeptidase&tripeptidase
E. Chymotrypsin&Phospholipase A
3. Which of the following zymogens can help in the screening of gastric disorders?
A. Trypsinogen
B. Pepsinogen
C. Chymotrypsinogen
D. Procollagenase
E. Procarboxypeptidase
4. Which of the following disorders can affect the release of pancreatic digestive enzymes into the intestinal lumen?
A. Hartnup disease
B. Cystinuria
C. Cystic fibrosis
D. Atrophic gastritis
E. Duodenal ulcer
5. Which of the following mechanisms facilitates the absorption and release of hydrophobic amino acids into the body's cells?
A. Aquaporins
B. Autophagosomes
C. Secondary active transporters
D. Simple diffusion
E. Facilitated diffusion
6. Which of the following statements about the degradation of body's proteins is INCORRECT ?
A. Proteins for degradation are recognized based on the presence of ubiquiting tags, PEST sequences, N-terminal or oxidized residues.
B. A single ubiquitin isopeptide assigns a regulatory function to a protein but multiple ubiquitin isopeptides targets the protein for degradation.
C. E1 binds and transfer an ubiqutin molecule to E2 and E3 joins the ubiquitin from E2 to the end terminal end of a target protein.
D. Lysosomal proteases break down body' proteins into polypeptides; while, proteasome complexes break them into single amino acids.
E. Binding of N-acetylglucosamine to the active sites of the proteasome inhibits protein degradation and the removal of this molecule facilitates protein degradation.
7. Which of the following enzyme pairs works best at a pH ~7.0 to breakdown plants starches and glycogen into maltose, maltotriose and limit dextrins?
  1. Lingual&pancreatic lipase
  2. Lingual&pancreatic α-amylase
  3. Pancreatic lipase&colipase
  4. Intestinal dipeptidases&pancreatic trypsin
8. Which of the following complex carbohydrates can reduce the absorption of cholesterol inside the intestinal tract?
A. Glycogen
B. Soluble fibers
C. Insoluble fibers
D. Amylose
E. Amylopectin
9. What is the metabolic function of the intestinal glycosidases?
A. Breaks down smaller carbohydrates into glucose, fructose and galactose.
B. Cleaves hydroxyl groups of dietary complex carbohydrates molecules.
C. Digests dietary complex carbohydrate in the mouth and the stomach.
D. Joins two simple sugars together to form complex carbohydrate molecules.
E. Allows passage of simple sugars inside the intestinal cells.
10. A patient's laboratory test is positive for fructose in urine only. All blood test results are normal. Which of the following enzymes is deficient in this patient?
A. Aldolase B
B. Phosphoglucomutase
C. 4-Epimerase
D. Fructokinase
E. Galactokinase

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Source:  OpenStax, Biochemistry exercises. OpenStax CNX. Apr 06, 2016 Download for free at https://legacy.cnx.org/content/col11386/1.4
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