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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? |
- Lingual&pancreatic lipase
- Lingual&pancreatic α-amylase
- Pancreatic lipase&colipase
- 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 |
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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