The Human Digestive System (OCR GCSE Biology A, Combined (Gateway Science Suite)): Quizzes
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Practise the questions
13 questions from this quiz
Why does food need to be broken down in the digestive system?
Why does food need to be broken down in the digestive system?
It's too large & insoluble to be absorbed
What is one purpose of hydrochloric acid in the stomach?
What is one purpose of hydrochloric acid in the stomach?
Kills bacteria in food
Where does absorption of soluble molecules like glucose occur?
Where does absorption of soluble molecules like glucose occur?
Small intestine
What does the liver produce to help digest lipids?
What does the liver produce to help digest lipids?
Bile
What does the large intestine absorb from undigested food?
What does the large intestine absorb from undigested food?
Water
What are enzymes in terms of their catalytic function?
What are enzymes in terms of their catalytic function?
Biological catalysts
In the lock and key hypothesis, what forms when substrate binds to enzyme?
In the lock and key hypothesis, what forms when substrate binds to enzyme?
Enzyme-substrate complex
What is the optimum temperature for most enzymes?
What is the optimum temperature for most enzymes?
37°C
What happens to an enzyme when temperature gets too high?
What happens to an enzyme when temperature gets too high?
It becomes denatured
What does amylase break starch down into?
What does amylase break starch down into?
Maltose
What do lipase enzymes convert lipids into?
What do lipase enzymes convert lipids into?
Fatty acids & glycerol
What colour does iodine turn if starch is present?
What colour does iodine turn if starch is present?
Blue-black
How does bile help lipase enzymes work more effectively?
How does bile help lipase enzymes work more effectively?
Breaks fats into smaller droplets