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Questions and Answers
Which of the following is NOT one of the two principal biological functions of steroids?
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?
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?
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
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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).
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