Which of the following statements about sterols is true? A) All sterols share a fused-ring structure with four rings. B) Sterols are found in the membranes of all living cells. C) Sterols are soluble in water, but less so in organic solvents such as chloroform. D) Cholesterol is the principal sterol in fungi. E) The principal sterol of animal cells is a hopanol.

Option A) All sterols share a fused-ring structure with four rings.

Explanation:

Sterols are a class of lipids containing the steroid nucleus with hydroxyl groups. The sterane nucleus has four rings fused together: 3 cyclohexane rings fused in a nonlinear manner and a terminal cyclopentane ring

A common example is cholesterol.

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1. is geographic distribution

2 is increasing complexity

3 is transitional forms