Chapter 14 & 15 Quiz

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Which of the following is an example of catabolism?

Conversion of small molecules into acetyl COA

Synthesis of more complex molecules from simple precursors

Conversion of energy from fuels into biologically useful forms (correct)

Oxidation of acetyl COA to produce ATP

What is the main function of digestive enzymes?

To break down proteins into amino acids

To cleave substrates by addition of a water molecule (correct)

To convert small molecules into acetyl COA

To activate zymogens or proenzymes

Why are all digestive enzymes originally secreted as zymogens or proenzymes?

To increase their catalytic activity

To prevent them from being active before reaching their target site (correct)

To protect them from degradation

To ensure proper digestion

Which enzyme is responsible for the cleavage of proteins into smaller fragments in the stomach?

Pepsinogen Signup and view all the answers

What activates secretin in the stomach?

Low pH of stomach acids Signup and view all the answers

Which enzyme cleaves trypsinogen into trypsin in the small intestine?

Enteropeptidase Signup and view all the answers

What is the role of lipases in lipid digestion?

Cleavage of lipids Signup and view all the answers

Which enzyme is responsible for the cleavage of peptides on the C-terminus of lysine and arginine residues in the small intestine?

Trypsin Signup and view all the answers

What stimulates the release of NaHCO3 from the pancreas, neutralizing the acid in the stomach?

Secretin Signup and view all the answers

What enzyme is responsible for the cleavage of trypsinogen into trypsin in the small intestine?

Enteropeptidase Signup and view all the answers

Which enzyme is a self-cleaving proenzyme that is converted into a proteolytic enzyme in the stomach?

Pepsinogen Signup and view all the answers

What hormone is stimulated by peptide digestion products of pepsin and causes the pancreas to secrete digestive enzymes?

Cholecystokinin Signup and view all the answers

What is the role of lipases in lipid digestion?

Cleavage of lipids into smaller fragments Signup and view all the answers

What is the primary role of catabolism?

Conversion of energy from fuels into biologically useful forms Signup and view all the answers

Why are fats a more efficient fuel source than carbohydrates such as glucose?

Fats are more reduced than glucose Signup and view all the answers

What is the activated carrier of 2-carbon fragments (acetyl groups) in metabolism?

Coenzyme A Signup and view all the answers

What is the oxidized form of NAD+ in fuel oxidation?

NADH Signup and view all the answers

Which of the following is an example of anabolism?

Synthesis of more complex molecules from simple precursors Signup and view all the answers

What is the main function of catabolism?

Conversion of energy from fuels into biologically useful forms Signup and view all the answers

Which of the following pathways can be both catabolic and anabolic?

Conversion of small molecules into acetyl COA Signup and view all the answers

What are all digestive enzymes originally secreted as?

Zymogens or proenzymes Signup and view all the answers

What is the mechanism by which digestive enzymes cleave their substrates?

Addition of a water molecule Signup and view all the answers

Which of the following is NOT a function of lipases in lipid digestion?

Activation of zymogens Signup and view all the answers

Which of the following is an example of catabolism?

Oxidation of acetyl COA to produce ATP Signup and view all the answers

Which of the following is responsible for the breakdown of proteins into smaller fragments in the stomach?

Protease Signup and view all the answers

What is the role of secretin in the stomach?

Regulation of pancreatic enzyme secretion Signup and view all the answers

What is the main product of digestion of small molecules?

CO2 Signup and view all the answers

Chapter 14 & 15 Quiz

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Questions and Answers

Which of the following is an example of catabolism?

What is the main function of digestive enzymes?

Why are all digestive enzymes originally secreted as zymogens or proenzymes?