G3 Digestion recap (Enzymes & Digestion process)

Which describes physical digestion?

• Food is broken down into smaller pieces by mechanical means

• Food is broken up into smaller pieces by physical means

• Food is broken down into small molecule through enzymes

• Food is broken up into small molecules through enzymes

What is an enzyme?

• Substances that react to form products

• Fats that help to speed up product formation

• Proteins that help speed up the rate of biological reactions

• Proteins that are chemically changed at the end of a reaction

The class of enzymes that digest carbohydrates is called (a)  

What is the name of the enzyme that digests starch?

• starchase

• amylase

• amlactase

• glucase

Which is NOT a characteristic of an enzyme?

• speeds up chemical reactions

• need optimum pH to function

• need optimum temperature to function

• is chemically changed at the end of the reaction

The name of the substance that reacts with an enzyme is called (a)  

Which is true about enzyme and its substrate?

• enzyme and substrate are complementary in shape

• enzyme and substrate have the same shape

• substrates have an active site

• the substrate catalyses the reaction of the enzyme

What is the active site?

• site on the substrate where the enzymes attach to

• part of the enzyme where chemical reactions take place

• part of the substrate where physical reactions take place

• part of the enzyme that is changed after the reaction

What is the enzyme that is found in the saliva?

• salivary starch

• salivary glucose

• salivary amylase

• salivary protease

Which statement about the oesophagus is true?

• it produces carbohydrases to digest starch

• physical digestion takes place in the oesophagus

• chemical digestion by salivary amylase continues in oesophagus

• it is made up of muscles that push food towards the mouth