which of the following is not true about protien

1. 20 amino acids are used in sythesis of all protiens
2. protiens are heteropolymers of amino acids
3. cellulose is most abudant in biosphere
4. proteins contain peptide bonds

Hello student
Correct answer is 3. Cellulose is most abundant in biosphere
Cellulose is most abundant Protein in animal world. Rubisco is most abundant protein in plants but whole biosphere.