Cell biology / Lipids

What are the building blocks of lipids?

• Monosaccharides

• Amino Acids

• Fatty Acids

• Nucleotides

What is the common name for lipids?

• fats

• oils

• waxes

• lubes

Which of the following is a source of saturated fat?

• 
• 
• 
• 

What type of lipid makes up the plasma membrane of the cell?

• Steroid

• Wax

• Phospholipid

• Cortisol

Cholesterol is an amphipathic lipid

• True

• False

• Maybe

Answer explanation

The only hydrophilic part of cholesterol is the hydroxyl group in the A-ring which makes it an amphipathic lipid and is therefore found on the surface of lipid layers along with phospholipid.

Which of the following occurs when hydrogen is reacted with vegetable oil?

• The hydrogenated vegetable oil will contain fewer trans fats.

• The hydrogenated vegetable oil will become solid at room temperature.

• The hydrogenated vegetable oil will become polarized.

• The hydrogenated vegetable oil will become a saturated fat.

Answer explanation

When hydrogenated, carbon atoms bond in a straight configuration and remain in a solid state at room temperature. This process of hydrogenation creates trans fats.

Lipids is insoluble in non-polar solvents such as hexane, chloroform, ether, and benzene.

• True

• False

• I don't know

• I don't care

Answer explanation

Lipids is soluble in non-polar solvents such as hexane, chloroform, ether, and benzene, and insoluble in water and polar solvents.

The phospholipid is an amphipathic liquid molecule.

• True

• False

• I don't know

• I don't care

Answer explanation

It contains both hydrophobic fatty acid C-H chains and a hydrophilic head group.

What are the components of a triglyceride molecule?

• One glycerol and two fatty acids

• One glycerol and one cholesterol

• One glycerol and three fatty acids

• One cholesterol and two fatty acids

Answer explanation

Triglycerides contain one glycerol and three fatty acid tails. The fatty acid tails may be identical or different (with different lengths or patterns of double bonds).

Which of the following are of elements of fatty acid structure?

i. A long hydrocarbon chain

ii. A carboxylic acid group

iii. Methyl or omega (ω) end

iv. water

• i, ii and iii

• ii, iii and iv

• i, iii and iv

• i, ii, iii and iv