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Final exam for all Carbohydrate and Nitrogen lectures.
| 1. Which of the following molecules
CANNOT be excreted by the kidneys as glucuronides? |
| A. |
Bile (stercobilin) |
| B. |
Progesterone |
| C. |
Bilirubin diglucuronide |
| D. |
Morphine |
| E. |
Thyroid hormone |
| 2. Which of the following molecules
DOES NOT
accumulate in blood
as a result of a defect in any of the enzymes of the urea cycle? |
| A. |
Any of the intermediates of the urea cycle |
| B. |
Ammonia in the form of NH4+ |
| C. |
Glutamine and alanine |
| D. |
All the intermediates of glycolysis |
| 3. Which of the following hormones regulates the excretion of both water and sodium counteracting the effects of other water homeostasis hormones? |
| A. |
Aldosterone |
| B. |
Antidiuretic hormone |
| C. |
Cortisol |
| D. |
Estrogen |
| E. |
Natriuretic peptides |
| 4. 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 |
| 5. 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 |
| 6. Which of the following zymogens can help in the screening of gastric disorders? |
| A. |
Trypsinogen |
| B. |
Pepsinogen |
| C. |
Chymotrypsinogen |
| D. |
Procollagenase |
| E. |
Procarboxypeptidase |
| 7. 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 |
| 8. 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 |
| 9. 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. |
| 10. 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 |
| 11. Which of the following enzymes pairs need to be activated via autocatalysis? |
| A. |
Pepsin&lysosomal proteases |
| B. |
Aminopeptidase&carboxypeptidase |
| C. |
Elastase&collagenase |
| D. |
Dipeptidase&tripeptidase |
| E. |
Chymotrypsin&Phospholipase A |
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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