Sample Practice Questions
Choose the best answer (Use CAPITAL letters).
1. Ionic bonds are formed between which of the following:
(A) Atoms sharing electrons
(B) Ions of opposite charge
(C) A partially positive hydrogen and a partially negative atom
(D) Two anions
(E) Two cations
2. All of the following are characteristics of water EXCEPT
(A) It is a polar molecule
(B) It is an excellent solvent
(C) It has a high heat capacity
(D) It has high surface tension
(E) It interacts well with nonpolar molecules
3. All of the following are carbohydrates EXCEPT
(A) Glucose
(B) Cellulose
(C) Polypeptides
(D) Starch
(E) Glycogen
4. Enzymes do all of the following EXCEPT
(A) Speed up reactions
(B) Respond to specific inhibitors
(C) Get consumed during reactions
(D) Bind substrates within an active site
(E) Release products
5. What scenario best describes a hydrolysis reaction?
(A) A water molecule is added across a covalent bond, breaking that bond.
(B) A new covalent bond is formed by the removal of a water molecule.
(C) Electrons are completely transferred between reactants.
(D) Amino acids are linked together with peptide bonds.
(E) Water molecules surround and separate ionically bonded atoms.
Answers and explanations for the multiple-choice questions are:
1. (B) Ionic bonds are formed between ions of opposite charge. Anions have negative charge
and cations have positive charge. Answer (A) describes covalent bonds. Answer (C)
describes hydrogen bonds. Answers (D) and (E) are wrong because ions of like charge do not
bond, but repel each other.
2. (E) Water interacts much more favorably with polar substances than with nonpolar substances.
All of the other choices are characteristics of water.
3. (C) Polypeptides fold to form functional proteins. Glucose, starch, and glycogen are all
carbohydrates.
4. (C) Enzymes are biological catalysts. Catalysts speed up reactions without themselves getting
altered or consumed.
5. (A) Hydrolysis is the breaking of a covalent bond by the addition of a water molecule
across that bond. Answers (B) and (D) describe a dehydration reaction. Answer (C)
describes a redox reaction. Answer (E) describes dissolution of an ionic compound.
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