BioChemistry Review

• Which of the following is an organic compound?

a. water c. oxygen

b. sugar d. table salt

• What example are enzymes normally compared to?

a. A post it note on a wall

c. A Co-worker

b. A lock & key d. A match

• Which of the following statements is true about catalysts?

a. Catalysts slow down the rate of chemical reactions.

b. All catalysts are enzymes.

c. Catalysts are used up during a chemical reaction.

d. Catalysts lower the activation energy of a chemical reaction.

• Which of the following statements about enzymes is NOT true?

a. Enzymes work best at a specified pH.b. Enzymes work in living and

nonliving thiings.c. Enzymes are proteins.d. Enzymes are organic catalysts.

• Which of the following is a form of energy that may be released during a chemical reaction?

a. heat c. light

b. sound d. all of the above

• If a reaction in one direction releases energy, the reaction in the opposite direction

a. also releases energy.

c. destroys energy.

b. absorbs energy. d. cannot occur.

• What is the term used to describe the energy needed to get a reaction started?

a. adhesion energy c. cohesion energy

b. activation energy d. chemical energy

• What is the process that changes one set of substances into another set of substances?

a. cohesion c. chemical reaction

b. adhesion d. dissolving

• Identify the reactant(s) in the chemical reaction, CO2 + H2O H2CO3.

a. CO2, H2O, and H2CO3

c. H2CO3

b. CO2 and H2O d. CO2

• In chemical reactions, atoms are

a. created. c. rearranged.b. destroyed. d. neutralized.

• Which statement is true?

a. Simple sugars are made of polysaccharides.

b. Glycerol is made of fatty acids.

c. RNA molecules are made of nucleotides.

d. Amino acids are made of proteins.

• Which of the following is NOT a function of proteins?

a. store and transmit heredity

b. help to fight disease

c. control the rate of reactions and regulate cell processes

d. build tissues such as bone and muscle

• Which of the following organic compounds is the main source of energy for living things?

a. carbohydrates c. nucleic acids

b. lipids d. proteins

• A monosaccharide is a

a. carbohydrate. c. nucleic acid.

b. lipid. d. protein.

• Amino acid is to protein as

a. fat is to lipid. c. sugar is to fat.

b. DNA is to RNA. d. simple sugar is to starch.

• If the pH of stomach acid and of oven cleaner were measured,

a. both would be below 7.b. both would be above 7.c. the pH of stomach acid would be above 7, but

the pH of oven cleaner would be below 7.d. the pH of stomach acid would be below 7, but

the pH of oven cleaner would be above 7.

• When salt is dissolved in water, water is the

a. reactant. c. solute.

b. solution. d. solvent.

• A solution is a(an)

a. breaking of a chemical bond.

b. chemical reaction.

c. evenly distributed mixture of two or more substances.

d. combination of two or more liquids.

• Which of the following lists the different types of chemical bonds in order of increasing attraction?

a. ionic, covalent, hydrogen

c. hydrogen, covalent, ionic

b. covalent, ionic, hydrogen

d. hydrogen, ionic, covalent

• Water molecules are polar, with the

a. oxygen side being slightly positive and the hydrogen side being slightly negative.

b. oxygen and hydrogen sides being slightly positive.

c. oxygen and hydrogen sides being slightly negative.

d. oxygen side being slightly negative and the hydrogen side being slightly positive.

• Which of the following statements about a compound is true?

a. The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.

b. Only the physical properties of a compound are usually the same as those of the elements from which it is formed.

c. Only the chemical properties of a compound are usually the same as those of the elements from which it is formed.

d. The physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.

a. starch e. structural proteinsb. cellulose f. hemoglobinc. chitin g. antibodiesd. glycogen h. enzymes

1. Indigestible plant structure2. Digestible plant storage3. Stored in liver for energy supply4. Animal & fungi structure; exoskeletons5. Transports oxygen in blood6. Defends against foreign substances7. Catalyze biochemical reactions by lowering

activation energy