A Level Biology: Lipids

What are lipids?

• Macromolecules that contain carbon, hydrogen, and oxygen atoms

• Macromolecules that contain nitrogen, hydrogen, and oxygen atoms

• Macromolecules that contain carbon, hydrogen, and nitrogen atoms

• Macromolecules that contain carbon, nitrogen, and oxygen atoms

What is the main difference between lipids and carbohydrates?

• Lipids contain a lower proportion of oxygen

• Lipids contain a higher proportion of oxygen

• Lipids contain a lower proportion of carbon

• Lipids contain a higher proportion of carbon

Which of the following best describes the solubility of lipids in water?

• Polar and hydrophilic (soluble in water)

• Non-polar and hydrophobic (insoluble in water)

• Polar and hydrophobic (insoluble in water)

• Non-polar and hydrophilic (soluble in water)

What are the two groups of lipids that you need to know?

• Triglycerides and phospholipids

• Monosaccharides and disaccharides

• Amino acids and proteins

• Nucleotides and nucleic acids

What are the monomers of triglycerides?

• Glycerol and fatty acids

• Glucose and fructose

• Amino acids and peptides

• Nucleotides and nucleic acids

What is the chemical formula for a fatty acid?

• RCOOH

• HCOOH

• CH3OH

• CH3COOH

What is the main difference between saturated and unsaturated fatty acids?

• Saturated fatty acids have double bonds, while unsaturated fatty acids do not

• Saturated fatty acids have a higher number of carbon atoms than unsaturated fatty acids

• Saturated fatty acids are solid at room temperature, while unsaturated fatty acids are liquid

• Saturated fatty acids are found in animal fat, while unsaturated fatty acids are found in vegetable oils

What is the difference between cis-fatty acids and trans-fatty acids?

• Cis-fatty acids are metabolized by enzymes, while trans-fatty acids are not

• Cis-fatty acids have H atoms on the same side of the double bond, while trans-fatty acids have H atoms on opposite sides

• Cis-fatty acids are found in animal fat, while trans-fatty acids are found in vegetable oils

• Cis-fatty acids have a higher number of carbon atoms than trans-fatty acids

How is a triglyceride formed?

• By esterification of glycerol and fatty acids

• By condensation of glucose and fructose

• By hydrolysis of amino acids and peptides

• By polymerization of nucleotides and nucleic acids

How many water molecules are released when one triglyceride is formed?

• One

• Two

• Three

• Four