Discussion
Which of the following is not a type of steroid?
Answer: C
The one that is not a steroid is insulin.
Insulin is a peptide hormone made of two polypeptide chains, A and B, joined by disulphide bonds, secreted by the beta cells of the pancreas.
Steroids share the four-ring steroid nucleus. Cholesterol is the parent steroid, bile acids are made from cholesterol in the liver, and vitamin D is a secosteroid formed from a cholesterol derivative in the skin. So all three of the other options are steroids.
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