Tobject]user: polypeptides contain
a. two amino acids joined by peptide bonds
b. four amino acids joined by peptide bonds
c. five to ten amino acids joined by peptide bonds
d. more than ten amino acids joined by peptide bonds

Answer is: D. more than ten amino acids joined by peptide bonds.

Polypeptide is a long and unbranched peptide chain with more than ten amino acids.

Proteins consist of one or more polypeptides arranged in a biologically functional way.

Peptide bond is a covalent chemical bond linking two consecutive alpha-amino acids from C1 (carbon number one) of one alpha-amino acid and N2 (nitrogen number two) of another along a peptide or protein chain.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

it would be a gas formation