Biochemistry Lipids Quiz

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Biochemistry Lipids Quiz - Quiz

Check out our amazing biochemistry quiz designed to test how much you know about lipids. You must have studied fats and lipids in your biochemistry chapters. It's time to check your knowledge regarding the same. Lipids are macro biomolecules that are insoluble in water but soluble in non-polar solvents like alcohol and ether. The following quiz also contains questions related to fats or oils. So, give it a try and expand your memory about lipids.


Questions and Answers
  • 1. 

    The basic backbone of most fat or oil molecules is an alcohol called....

    • A.

      Glycerol

    • B.

      Glycerin

    • C.

      Glyceric acid

    • D.

      Glycogen

    Correct Answer
    A. Glycerol
    Explanation
    Glycerol is a very simple 3 carbon molecule. Each carbon carries a hydroxyl functional group. (OH)

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  • 2. 

    Which of these statements best describes the composition of Lipids?

    • A.

      C, H, O in a 1:2:1 Ratio

    • B.

      C, H, O, N, P all present

    • C.

      C, H, O in no specific ratio

    • D.

      C, H, O, S

    Correct Answer
    C. C, H, O in no specific ratio
    Explanation
    Lipids are a diverse group of organic compounds that are primarily composed of carbon (C), hydrogen (H), and oxygen (O). Unlike carbohydrates, lipids do not have a specific ratio of these elements; their composition varies widely depending on the type of lipid. While some lipids may contain small amounts of other elements like nitrogen (N), phosphorus (P), or sulfur (S), the primary elements found in lipids are C, H, and O. Therefore, option C is the most accurate description of the composition of lipids.

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  • 3. 

    Which of the following functional groups would be found in typical lipids?

    • A.

      Carboxyl -COOH (O=C-O-H)

    • B.

      Hydroxyl -OH

    • C.

      Carbonyl -C=O

    • D.

      All of these are possible

    Correct Answer
    C. Carbonyl -C=O
    Explanation
    The carbonyl functional group (-C=O) is commonly found in lipids, specifically in compounds such as fatty acids and triglycerides. This functional group consists of a carbon atom double-bonded to an oxygen atom. While hydroxyl (-OH) and carboxyl (-COOH) functional groups are present in other types of organic compounds, they are not typically found in lipids. Therefore, option C, stating that the carbonyl functional group is found in typical lipids, is correct.

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  • 4. 

    The image below shows a molecule of Octanoic Acid. Which type of molecule is it?

    • A.

      An alcohol

    • B.

      An unsaturated fatty acid

    • C.

      A saturated fatty acid

    • D.

      None of the above mentioned

    Correct Answer
    C. A saturated fatty acid
    Explanation
    The molecule only exhibits single bonds between carbons (C-C)

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  • 5. 

    Which of the following would be true of this molecule?

    • A.

      It is a triglyceride fat

    • B.

      It is most likely liquid at room temperature

    • C.

      It is most likely a solid at room temperature

    • D.

      Only a & b

    • E.

      Only a & c

    Correct Answer
    D. Only a & b
    Explanation
    This is clearly a triglyceride: Glycerol bonded to 3 fatty acids. The second and third fatty acids have bent chains, indicating that they're unsaturated fatty acids. Hence this is more likely to be an oil than a solid fat.

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  • 6. 

    Which of these statements best describes these molecules?

    • A.

      They are both fatty acids.

    • B.

      They are both saturated fatty acids.

    • C.

      The top one is an unsaturated fatty acid; the lower one is saturated.

    • D.

      The top one is a saturated fatty acid; the lower one is polyunsaturated.

    • E.

      They are both unsaturated fatty acids.

    Correct Answer
    D. The top one is a saturated fatty acid; the lower one is polyunsaturated.
    Explanation
    Only the lower molecule shows any double bonds; it is unsaturated - specifically, because it has two C=C double bonds, it is a polyunsaturated fat.

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  • 7. 

    Which of these is NOT a typical role for lipids in a living organism?

    • A.

      Provide stored energy reserves

    • B.

      Form a structural component of cell membranes & many tissues

    • C.

      A source of glucose, when broken down

    • D.

      A material from which hormones can be produced

    • E.

      Protection of internal organs, insulation beneath skin

    Correct Answer
    C. A source of glucose, when broken down
    Explanation
    Vertebrates store lipids for future nutritional energy, and even as insulation & protection of internal organs. Lipids make up all eukaryotic cell membranes. Steroid hormones are of lipid origin. Only starches produce glucose when digested.

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  • 8. 

    This is a molecule of Linoleic acid. Which statement best describes it?

    • A.

      It is an unsaturated fatty acid.

    • B.

      It is a saturated fatty acid.

    • C.

      It is a triglyceride fat.

    • D.

      It is a sterol.

    Correct Answer
    A. It is an unsaturated fatty acid.
    Explanation
    The carboxyl group at one end (red) and the bent shape of the molecule, indicatin a double or triple Carbon bond, make this an unaturated fatty acid.

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  • 9. 

    Which molecule is shown below?

    • A.

      Triglyceride

    • B.

      Fatty acid

    • C.

      Cholesterol

    • D.

      Glycerol

    Correct Answer
    C. Cholesterol
    Explanation
    The four-ring structure is a tell-tale sign of cholesterol

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  • 10. 

    Examine the diagram below, showing a phospholipid. The areas labelled A, B, C, D are (in order...)...

    • A.

      Protein, phosphate, carbohydrate, lipid

    • B.

      Phosphate, glycerol, fatty acids, nitrogenous base

    • C.

      Amino acid residue, phosphate group, glycerol, fatty acids

    • D.

      Fatty acids, phosphate, carbohydrate, hydrocarbon

    • E.

      Amino acid residue, fatty acid, glycerol, phosphate

    Correct Answer
    C. Amino acid residue, phosphate group, glycerol, fatty acids
    Explanation
    Area A: This is the phosphate group. It is the polar head of the phospholipid molecule and consists of a phosphorus atom bonded to four oxygen atoms. The phosphate group is hydrophilic, meaning it attracts water.
    Area B: This is the glycerol backbone. It is a three-carbon alcohol molecule that forms the central core of the phospholipid molecule. The glycerol backbone is also hydrophilic.
    Area C: These are the fatty acid tails. They are two hydrocarbon chains, typically 14-20 carbons long, attached to the glycerol backbone by ester bonds. The fatty acid tails are hydrophobic, meaning they repel water.
    Area D: This is the nitrogenous base. It is a molecule containing a nitrogen atom, such as choline or ethanolamine, attached to the phosphate group by a phosphodiester bond. The nitrogenous base can be either hydrophilic or hydrophobic depending on its specific structure

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  • 11. 

    The main role of phospholipids in living cells is to...

    • A.

      Store energy for future nutritional leads

    • B.

      Make the cell wall in plant cells

    • C.

      Make insect exoskeletons

    • D.

      Form cell membranes in all eukaryotic cells

    • E.

      Form the basis of many hormones

    Correct Answer
    D. Form cell membranes in all eukaryotic cells
    Explanation
    Phospholipids arranged in a bilayer are the basis of all cell membranes.

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  • 12. 

    Examine the image of a phospholipid, below. Note that some areas are labelled hydrophobic, and others are hydrophilic. What is the term we use for molecules, like this one, that have both properties?

    • A.

      Hydrogenous

    • B.

      Ambivalent

    • C.

      Amphiphilic

    • D.

      Ambidextrous

    • E.

      Antipasto

    Correct Answer
    C. Amphiphilic
    Explanation
    Please don't tell me you picked antipasto. Unless you're hungry.

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  • 13. 

    In an aqueous environment, phospholipids will form which of the following?

    • A.

      Micelles

    • B.

      Liposomes

    • C.

      Bilayers

    • D.

      All of the above

    • E.

      Only a & c

    Correct Answer
    D. All of the above
    Explanation
    All 3 can form, depending on concentration. They form spontaneously, based on hydrophobic-hydrophilic interactions.

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  • 14. 

    Which of the following common materials behaves as an amphoteric molecule?

    • A.

      Olive oil

    • B.

      Detergent

    • C.

      Lard

    • D.

      Fat

    Correct Answer
    B. Detergent
    Explanation
    Detergent molecules are amphoteric.

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  • 15. 

    The first cells likely developed from spontaneous associations of phospholipids, called....?

    • A.

      Liposomes

    • B.

      Micelles

    • C.

      Macrophages

    • D.

      Lipoproteins

    • E.

      Microlipids

    Correct Answer
    A. Liposomes
    Explanation
    Liposomes are hollow spheres; capturing the right chemical mix plus a little DNA or RNA gives you a primitive cell.

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  • 16. 

    All plant lipids are liquids, or oils.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Many plant lipids are solids, i.e. cocoa butter.

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  • 17. 

    Lipids and carbohydrates have virtually the same composition.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Lipids and carbohydrates have different compositions. Lipids, including fats and oils, are composed of carbon, hydrogen, and oxygen, but the ratio of hydrogen to oxygen is higher than in carbohydrates. Carbohydrates, such as sugars and starches, have a 1:2:1 ratio of carbon, hydrogen, and oxygen.

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  • 18. 

    When lipids are being digested, the cell uses up one water molecule.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Lipids are hydrophobic, meaning they do not dissolve in water. Therefore, the body uses bile to emulsify lipids and break them down into smaller components for absorption. During this process, the body does not use up a water molecule.
    Therefore, the statement “When lipids are being digested, the cell uses up one water molecule” is false.

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  • 19. 

    Which of the following best describes the formation of lipids?

    • A.

      Isomerization

    • B.

      Polymerization

    • C.

      Dehydration synthesis

    • D.

      Ammonification

    Correct Answer
    C. Dehydration synthesis
    Explanation
    Dehydration synthesis is the best description for the formation of lipids. This process involves the removal of water molecules to join smaller molecules together and form larger molecules. In the case of lipids, dehydration synthesis occurs when glycerol and fatty acids combine to form triglycerides. This reaction releases a water molecule for each bond formed, resulting in the synthesis of lipids.

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  • 20. 

    The breakdown of lipids involves the breaking of a bond using water. This is a process called...?

    • A.

      Hydration

    • B.

      Dehydration

    • C.

      Hydrophobia

    • D.

      Hydrophilia

    • E.

      Hydrolysis

    Correct Answer
    E. Hydrolysis
    Explanation
    The breaking (lysis) of a molecule using water (hydro) is hydrolysis.

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  • Current Version
  • Mar 28, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 10, 2011
    Quiz Created by
    Astosich
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