Biomolecules & Metabolism Revision

The types of compounds that comprise the major food groups include carbohydrates, fats and proteins. A sample, containing only one of these three types of compounds, is analysed and found to contain the following percentages by mass:

Carbon 76.2%

Oxygen 11.3%

Nitrogen 0%

The compound:

• is likely to be a fat

• is likely to be a protein

• is likely to be a carbohydrate

• cannot be identified as the percentage composition of other elements has not been given

Which of the following compounds contain an amide functional group?

• CH₃CH₂NHCH₃

• CH₃N(CH₃)₂

• NH₂CH₃CHCOOH

• CH₃CH₂CONH₂

Which one of the following amino acids contains a non-polar Z group?

• Alanine

• Arginine

• Asparagine

• Aspartic Acid

Which of the following is true about the sugar substitute aspartame? Aspartame contains:

• a glycosidic link only

• a petide link and a glycosidc link

• an ester link only

• a peptide link and an ester link

Which of the following contains a glycosidic (or ether) link?

• fuctose

• glucose

• lactose

• glycerol

Arachidonic acid is a fatty acid with:

• 0 C=C bonds

• 2 C=C bonds

• 4 C=C bonds

• 6 C=C bonds

When a protein is heated to 80^ₒC, the part of the protein which is least affected is the:

• primary structure

• secondary structure

• tertiary structure

• quaternary structure

Based on the information shown, which one of the following servings has the highest energy content?

• 100g eggs

• 100g beef

• 100g bread

• 100g cheese

Which of the substances below provides the least amount of energy for the human body?

• cellulose

• stearic acid

• glycine

• starch

The data provided can be used to calculate the heat of combustion of the nut. Assuming complete combustion of the nut, the ΔH value is closest to:

• 2.98 kJ/g

• 3.79 kJ/g

• 2980 kJ/g

• 3790 kJ/g