3.3 Organisms Exchange Substances With Their Environment Flashcards
Define digestion.
The hydrolysis of large insoluble biological molecules into smaller more soluble molecules that can be absorbed across cell membranes.
What is the enzyme that breaks down starch?
Amylase
What are the products of the hydrolysis of starch?
Maltose
Where is amylase used in the digestive system?
In the mouth and the small intestine
Where is amylase made?
It is made in the salivary glands, pancreas and the small intestine
What is the enzyme that breaks down maltose?
Maltase
What are the products of the hydrolysis of maltose?
Glucose
Where is maltase found in the digestive system?
It is embedded in the cell-surface membrane of the epithelial cells lining the small intestine
Where does protein digestion occur first?
In the lumen of the stomach
What is the role of endopeptidases?
They hydrolise the peptide bonds within the polypeptide chains to produce dipeptides
What is the role of exopeptidases?
They hydrolise the peptide bonds at the end of polypeptide chains to produce dipeptides
What are the role of dipeptidase?
They hydrolise the peptide bonds between the amino acids in the dipeptides.
Where are dipeptidases found?
They are embedded in the
Where are dipeptidases found?
It is embedded in the cell-surface membrane of the epithelial cells lining the small intestine
Where are endopeptidases and exopeptidases found in the digestive system?
It is found in the lumen of the gut
