QCM : Digestive System: Enzymes and Absorption — 3 questions

Questions et réponses du QCM

1. What is one important effect of hydrochloric acid in the stomach that also helps pepsin work effectively?

It raises the pH so pepsin can function in the intestine
It neutralises the stomach contents so pepsin becomes inactive
It creates a very low pH that kills harmful microbes and helps set the optimum pH for pepsin
It breaks proteins directly into amino acids without enzymes

It creates a very low pH that kills harmful microbes and helps set the optimum pH for pepsin

Explication

Hydrochloric acid makes the stomach highly acidic, which helps denature harmful microorganisms and provides the optimum pH for pepsin activity. Pepsin depends on this acidic environment to work well.

2. What is the primary role of hydrochloric acid in gastric juice?

To increase the pH of food in the stomach for enzyme function.
To create a low pH environment that denatures harmful microorganisms and primes pepsin activity.
To neutralise stomach acid entering the small intestine.
To directly digest proteins in food.

To create a low pH environment that denatures harmful microorganisms and primes pepsin activity.

Explication

Hydrochloric acid creates a low pH that denatures microbes and provides the optimum environment for pepsin to work effectively, which is essential for protein digestion in the stomach.

3. Which statement best describes enzymes in digestion?

They are physical processes that break food into smaller pieces
They are carbohydrates that store energy for digestion
They are organs that absorb digested food into the body
They are proteins that act as biological catalysts and are not changed by the reaction

They are proteins that act as biological catalysts and are not changed by the reaction

Explication

Enzymes are protein catalysts that speed up chemical reactions without being consumed. Mechanical digestion is the physical breakdown of food, not an enzyme process.

Révisez avec les flashcards

Mémorisez les réponses avec 9 flashcards sur Digestive System: Enzymes and Absorption.

Hydrochloric acid — role?

Creates low pH to denature microbes and prime pepsin.

Hydrochloric acid role

Creates low pH, denatures microbes, primes pepsin

Enzymes — function?

Speed up reactions without being consumed.

Voir les flashcards →

Approfondir avec la fiche

Consultez la fiche de révision complète sur Digestive System: Enzymes and Absorption.

Voir la fiche →

Cours similaires

Principes fondamentaux de la sécurité incendie

SVT

Introduction aux notions fondamentales en mathématiques

Mathématiques

Introduction aux fluides et écoulements

Physique

Périmètres et Aires

Mathématiques

Maths bac 2026 pour débutants

Mathématiques

Introduction aux circuits électriques simples

Physique

Crée tes propres QCM

Importe ton cours et l'IA génère des QCM avec corrections en 30 secondes.

Générateur de QCM