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Summary OCR A/AS-Level Biology 2.2.7 Cholesterol £2.99   Add to cart

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Summary OCR A/AS-Level Biology 2.2.7 Cholesterol

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Revision summary of key knowledge from OCR A/AS-Level Biology 2.2.7 Cholesterol.

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  • Chapter 2.2.7
  • June 26, 2023
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  • 2022/2023
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Cholesterol
Cholesterol
 A steroid alcohol or sterol (hence chole-sterol)
 Sterols are a type of lipid which are not made from glycerol or fatty acids
 Consists of four carbon-based rings called isoprene-units
 Small and hydrophobic therefore it can pass through the hydrophobic middle of
phospholipid bilayer membranes
 Regulates the fluidity of the membrane
 Mainly found in the liver of animals
 Plants have a cholesterol derivative in their membranes called stigmasterol
 Stigmasterol only differs from cholesterol in the extra double bond between C 22 and C23
 Steroid hormones are all made of cholesterol, hence they can pass through the
hydrophobic part of membranes

Structure
 Formula: C₂₆H₄₆0

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