Unit 2 - Proteins Flashcards
1
Q
What are the monomeric units of proteins?
A
Amino acids
2
Q
Where do we get amino acids from?
A
Our diet
3
Q
Outline the journey an amino acid takes from food to protein in a cell
A
- food is ingested
- enzymes in the stomach/small intestine hydrolyse protein into amino acids
- the amino acids are absorbed by the gut wall into the blood
- the amino acids leave the blood in the tissue fluid and enter cells
- proteins are synthesised on the ribosomes
4
Q
Give 4 functions of proteins
A
- enzymes
- hormones
- antibodies
- structural proteins
5
Q
What is a chain of amino acids called?
A
A polypeptide
6
Q
What is the function of haemoglobin?
A
Carries oxygen in the blood in erythrocytes
7
Q
How many oxygen atoms can one haemoglobin molecule carry?
A
8- remember ATOMS not MOLECULES
8
Q
What is the function of catalase?
A
Break down of hydrogen peroxide which otherwise is harmful to cells
9
Q
Define polypeptide
A
Chains of 3 or more amino acids
10
Q
Define protein
A
one or more polypeptides arranged as a complex macromolecule
