Structure and properties of proteins
Answers are for parents and teachers.
1
Write the 4 levels of protein structure with one example each.
Primary: amino acid sequence; secondary: keratin helix; tertiary: myoglobin; quaternary: haemoglobin.
2
What is the approximate mass of a protein of 500 amino acids? (residue 120)
60000
3
How many polypeptide chains are in 10 haemoglobin molecules? (4 in each)
40
4
Write the difference between albumins and globulins.
Albumins dissolve in pure water, globulins in weak salt solution.
5
Why is protein-rich food (meat, milk, legumes) important during growth?
The body needs amino acids to build its own proteins; it gets the essential ones only from food.