Lipids Multiple Choice Quiz

What are the constituent molecules in a lipid/triglyceride?

• Glycerol and amino acids

• Glycerol and fatty acids

• Fatty acids and glucose

• Glycerol and phosphate

What are the differences between a triglyceride and a phospholipid?

• Phospholipids have more fatty acids

• Phospholipids have a phosphate group instead of one fatty acid

• Triglycerides are found in membranes

• Triglycerides contain phosphate groups

Distinguish between a saturated and unsaturated fatty acid:

• Saturated fatty acids have carbon-carbon double bonds

• Unsaturated fatty acids have one or more carbon-carbon double bonds; saturated have none

• Saturated fatty acids have fewer hydrogens

• Unsaturated fatty acids are solid at room temperature

Which of the following is NOT a function of lipids?

• Energy storage

• Insulation

• Catalysis

• Protection

Why are lipids a good energy store?

• They have many C-H bonds and are energy-dense

• They dissolve in water

• They contain iron

• They are compact and insoluble

What is the general formula for a saturated fatty acid?

• CnH2n+2COOH

• CnH(2n)O2

• CnH2nO2

• CnH2n-2COOH

Why is consumption of too many saturated fats considered unhealthy?

• They are insoluble in water

• They can increase LDL cholesterol and risk of heart disease

• They are used in respiration

• They cause dehydration

Which part of a phospholipid is hydrophilic and which is hydrophobic?

• Fatty acid tails are hydrophilic, head is hydrophobic

• Both are hydrophilic

• Phosphate head is hydrophilic, fatty acid tails are hydrophobic

• Both are hydrophobic

What is the bond called between a fatty acid and glycerol?

• Hydrogen bond

• Ester bond

• Glycosidic bond

• Peptide bond

How would you test for the presence of a lipid?

• Add iodine

• Heat with Benedict’s

• Add ethanol and water – look for a milky-white emulsion

• Add biuret reagent