Quiz

QUIZ

1. Which organic molecule is not considered a biochemical molecule?

a. Glucose b. Oligopeptide c. Octane d. Lipoic acid

Answer: c. Each of these is representative of an organic molecule; however, hydrocarbons like octane are organic but not biochemical in nature because they do not exist in living things. Only methane is a hydrocarbon that exists in life.

2. What is the definition of an organic molecule?

a. A molecule that is neither acidic nor basic. b. A molecule that contains carbon. c. A molecule found in living things. d. A molecule that is hydrophobic or water-hating.

Answer: b. Organic molecules, by definition, contain carbon so these are carbon-based molecules.

3. Which of the following is considered a polymer rather than a monomer?

a. Amino acid b. Glucose c. Glycogen d. Fructose

Answer: c. Glycogen is a long chain of glucose molecules so it is a polymer rather than a monomer. The other choices represent single subunits or monomers.

4. What needs to be an end product of a chemical reaction that is a dehydration synthetic reaction?

a. Some type of monomer b. Water c. Carbon dioxide d. Some type of acid or base

Answer: b. In a dehydration reaction in biochemistry, a polymer is often created and water is always one of the end products. Water is taken out of the monomers in order to make the polymer.

5. Which type of lipid has a ringed structure?

a. Fatty acid b. Triglyceride c. Phospholipid d. Cholesterol

Answer: d. The main difference between cholesterol and other lipids is that cholesterol has a ringed structure and the others are straightchained structures.

6. What part of the phospholipid molecule will most likely associate with water?

a. Glycerol b. Phosphate c. Saturated fatty acid d. Unsaturated fatty acid

Answer: b. The polar and most hydrophilic component of the phospholipid molecule is phosphate, which will be the part that interacts with water.

7. What defines the amino group on all amino acids?

a. NO group b. COOH group c. NHO group d. NH2 group

Answer: d. All amino acids have an NH2 amino functional group as well as a COOH carboxyl functional group that together define what an amino acid is.

8. What type of bonding is not seen in peptides and proteins that give its shape?

a. Disulfide bonds b. Hydrogen bonds c. Metallic bonds d. Ionic bonds

Answer: c. Metallic bonds are not seen on proteins but the others are seen in a protein or peptide to give the molecule its three-dimensional shape.

9. What kind of carbohydrate is glucose?

a. Pentose b. Hexose c. Tetrose d. Triose

Answer: b. Glucose is a hexose because it has six carbon atoms in the molecule. Most of the common carbohydrate monomers are hexoses.

10. What are glycogen and cellulose made of?

a. Sucrose b. Galactose c. Glucose d. Fructose

Answer: c. All of the major polysaccharides in nature are ultimately made from strings of glucose molecules.