Back to Basics - Food Molecules

15 Points Per Correct Answer - No time limit  

1. What name can be given to glucose, fructose and galactose? Monosaccarides Polysaccarides Disaccarides Non-Reducing sugars

2. It is widely known that the building blocks of proteins are amino acids. What reaction allows several amino acids to join together to form a protein? Hydrolysis Condensation reaction Evapouration reaction Hydrogenation

3. Many people talk about "good" and "bad" fats. What must a fat contain to be classed as a "good" fat? No C=C double bonds A hydrocarbon chain shorter than 100 carbons A hydrocarbon chain longer than 100 carbons At least one C=C double bond

4. When using Biuret's test, which macromolecule will produce a positive reaction (colour change from blue to lilac)? Carbohydrate Protein Fat All three

5. After eating proteins, fats or carbohydrates, they must be digested as they are large insoluble molecules and so cannot be absorbed into the blood stream. Enzymes catalyse the breakdown of these molecules into smaller soluble molecules. Which macromolecule would be most likely to bind with endopeptidase? Carbohydrate None of these Fat Protein

6. Once digested, fats, proteins and carbohydrates eventually enter the bloodstream. Which of the following recombine to form chylomicrons in epithelial cells of the small intestine before eventually entering the bloodstream via the subclavian vein? Amino acids Fatty acids and glycerol Glucose Fructose

7. Which macromolecule's functions include insulation, waterproofing, energy storage and shock absorption? Proteins Fats Carbohydrates All three

8. Which carbohydrate is a long unbranched chain of beta-glucose molecules, which is indigestible to mammals? Starch Glycogen Cellulose Lactose

9. Animal cell membranes are mainly composed of a phospholipid bilayer. What happens to a triglyceride to form a phospholipid? Gain of two organic phosphates Gain of two inorganic phosphates Loss of one fatty acid and gain of one inorganic phosphate group All three fatty acids replaced by inorganic phosphates

10. There are 20 naturally occurring amino acids and the many combinations of these monomers gives rise to a huge number of proteins, all with different functions. One use of proteins in the human body is as enzymes. Which of these bonds holds an enzyme in its tertiary structure? Oxygen bonds Hydrogen bonds Carbon bonds Nitrogen bonds