Multiple Choice
What is the effect of cholesterol in a membrane?
A) Increases membrane fluidity by preventing acyl chain packing.
B) Reduces membrane fluidity acyl chain movement.
D) Both a & b.
E) Neither a or b.
10. Lipids
Steroids
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following structures is a sterol?
A) A.
B) B.
C) C.
D) D.
A
B
C
D
Verified step by step guidance1
Identify the structural characteristics of a sterol. Sterols are a subgroup of steroids and have a characteristic structure of four fused rings: three cyclohexane rings and one cyclopentane ring, with a hydroxyl group (-OH) at the 3-position of the A-ring.
Examine each structure provided in the images. Look for the presence of the four-ring core structure typical of steroids, which includes three six-membered rings and one five-membered ring.
Check for the presence of a hydroxyl group (-OH) attached to the A-ring, which is a key feature of sterols.
Analyze structure A: It has the four-ring steroid structure but lacks the hydroxyl group, instead having a ketone group (C=O).
Analyze structure B: Similar to A, it has the steroid core but lacks the hydroxyl group, having a ketone group instead. Analyze structures C and D: Both have the steroid core and a hydroxyl group at the 3-position, which is characteristic of sterols.
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