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.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.