Biology  by Bradford
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1.5 Lipids: revision map

The subtopic in the middle and four tasks round it: label two diagrams, complete a table and fill 14 gaps. Every box rests on a learning objective of the topic in the AP Biology course and exam description. Type into the blanks and check them, or print it on A4, Letter or A3 with an answer key.

Unit 1 practice questionsThe whole Unit 1 map

Topic 1.5

Lipids

AP Biology ยท Unit 1 Chemistry of LifeName

1.5.ASaturated and unsaturated fatty acids

room temperature: solidroom temperature: liquid1234
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1.5.AA bilayer in water

outside the cellinside the cell123
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Topic 1.5Lipids

1.5.ATypes of lipid

LipidBuilt fromMain job
glycerol and three fatty acidslong-term energy storage and insulation
glycerol, two fatty acids and a phosphate groupforms the cell membrane bilayer
four fused carbon ringshormones such as estrogen; cholesterol in animal membranes

What they share is that they are mostly , so they are not soluble in water. They are not polymers.

1.5.ASaturation sets the structure

A saturated fatty acid has no carbon-carbon double bonds, so its tail is straight and the molecules pack tightly: fats of this kind, such as animal fat, are at room temperature. An fatty acid has one or more double bonds, each bending the tail, so molecules cannot pack as closely and plant oils are liquid. In a membrane, kinked tails keep the bilayer . A phospholipid is amphipathic: its polar head meets water and its nonpolar tails face each other.

Word bank double bondfluidglycerolhydrocarbon tailhydrophilic headhydrophobic tailsnonpolarPhospholipidsaturated fatty acidsolidSteroidTriglycerideunsaturatedwater

Answer key

Every box on the sheet with its gaps filled in, as the subtopic reads in full.

  1. LabelSaturated and unsaturated fatty acids

    1. glycerol
    2. saturated fatty acid
    3. double bond
    4. hydrocarbon tail

  2. LabelA bilayer in water

    1. hydrophilic head
    2. hydrophobic tails
    3. water

  3. TableTypes of lipid

    LipidBuilt fromMain job
    Triglycerideglycerol and three fatty acidslong-term energy storage and insulation
    Phospholipidglycerol, two fatty acids and a phosphate groupforms the cell membrane bilayer
    Steroidfour fused carbon ringshormones such as estrogen; cholesterol in animal membranes

    What they share is that they are mostly nonpolar, so they are not soluble in water. They are not polymers.

  4. GapsSaturation sets the structure

    A saturated fatty acid has no carbon-carbon double bonds, so its tail is straight and the molecules pack tightly: fats of this kind, such as animal fat, are solid at room temperature. An unsaturated fatty acid has one or more double bonds, each bending the tail, so molecules cannot pack as closely and plant oils are liquid. In a membrane, kinked tails keep the bilayer fluid. A phospholipid is amphipathic: its polar head meets water and its nonpolar tails face each other.