Cholesterol is synthesized by all animal cells and is mainly synthesized in the liver. cholesterol also serves as a precursor for several important biological compounds including all, except a. insulin b. vitamin d c. bite salts d. testosterone

The correct answer is A insulin

Explanation:

Cholesterol is a complex lipid which act as precursor for the synthesis of steroid compounds such as vitamin D a lipid soluble vitamin,testosterone a steroid hormone and bile salt helps in fat digestion.

     Insulin is a peptide hormone it is composed of amino acids linked with each other by peptide linkages .As a result insulin cannot be synthesized from cholesterol.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: