Mental Health First Aid Quiz

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Questions and Answers

Which of the following is NOT one of the two principal biological functions of steroids?

Both A and B are principal biological functions of steroids
As enzymes that catalyze chemical reactions (correct)
As important components of cell membranes that alter membrane fluidity
As signaling molecules

What are the two sterols from which all steroids are manufactured in cells?

Lanosterol and cycloartenol (correct)
Cycloartenol and squalene
Cholesterol and squalene
Lanosterol and squalene

What is the typical composition of the steroid core structure?

Fifteen carbon atoms bonded in four fused rings: two six-member cyclohexane rings and two five-member cyclopentane rings
Seventeen carbon atoms bonded in four fused rings: three six-member cyclohexane rings and one five-member cyclopentane ring (correct)
Sixteen carbon atoms bonded in three fused rings: two six-member cyclohexane rings and one five-member cyclopentane ring
Eighteen carbon atoms bonded in five fused rings: four six-member cyclohexane rings and one five-member cyclopentane ring

Flashcards

Steroid biological functions

Steroids primarily function as hormones (signaling molecules) and as structural components of cell membranes, not as enzymes that catalyze reactions.

Steroid Precursors

Lanosterol (in animals and fungi) and cycloartenol (in plants) are the biosynthetic precursors from which all steroids are derived.

Steroid Core Structure

The steroid core consists of seventeen carbon atoms in four fused rings: three cyclohexane rings (6 carbons each) and one cyclopentane ring (5 carbons).

Study Notes

Steroids

One of the two principal biological functions of steroids is NOT involved in gene expression.
The two sterols from which all steroids are manufactured in cells are lanosterol and cycloartenol.
The typical composition of the steroid core structure consists of four fused rings (three cyclohexane rings and one cyclopentane ring).