Questions 1-12

Reviewing Concepts
Multiple Choice
Choose the letter of the best answer.

1. Which of the following is not an organic molecule?
a. cellulose
b. sucrose
c. water
d. testosterone

Answer: c

2. Which of the following terms includes all the other terms on this list?
a. polysaccharide
b. carbohydrate
c. monosaccharide
d. glycogen

Answer: B

3. Which term is most appropriate to describe a molecule that dissolves easily in water?
a. hydrocarbon
b. hydrophobic
c. hydrophilic
d. organic

Answer: C

4. Cholesterol is an example of what kind of molecule?
a. protein
b. lipid
c. amino acid
d. carbohydrate

Answer: B

5. The 20 amino acids vary only in their
a. carboxyl goups.
b. side groups.
c. amino groups.
d. lipid groups.

Answer: B

6. A specific reactant an enzyme acts upon is called the
a. catalyst.
b. sucrase.
c. active site.
d. substrate.

Answer: C

7. An enzyme does which of the following?
a. adds heat to a reaction, speeding it up
b. lowers the activation energy of a reaction
c. cools a reaction, slowing it down
d. raises the activation energy of a reaction

Answer: B

Short Answer
8. Besides satisfying your hunger, why else might you consume a big bowl of pasta the night before a race?

Answer: You need the carbohydrate to keep you're energy up during the big race.

9. How are glucose, sucrose, and starch related?

Answer: Sucrose and starch are related because they are all Saccharides.

10. What are steroids? Describe two functions they have in cells.

Answer: A steroid is a lipid characterized by a carbon skeleton with four fused rings. Two functions they have in cells would be: circling you're body with chemical signals, and make the appearance of a male and a female different.

11. How are polypeptides related to proteins?

Answer:Polypeptides build up the structure of the protein

12. How does denaturation affect the ability of a protein to function?

Answer: Denaturation affect the ability of a protein to function because it changes their shape so they might not function properly.