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Name _______________________ Period ___ Date _______ Test Form _________
Ch. 2 Test – Chemistry of Life
Form A
MULTIPLE CHOICE
1. Molecules like molecule B are found in
Molecule A (A) carbohydrates
(B) lipids
Molecule B (C) proteins
(D) nucleic acids
2. Which is the negatively charged particle in an atom?
(A) nucleus
(C) electron
(B) neutron
(D) proton
3. 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
4. Which of the following is NOT a lipid?
(A) oil
(B) wax
(C) steroid
(D) glycogen
5. Which of the following is produced from polymerization?
(A) a water molecule
(C) a glucose molecule
(B) monomers
(D) starch
6. The monomers that make up nucleic acids are known as
(A) nucleotides
(C) fatty acids
(B) monosaccharides
(D) amino acids
7. Which term does NOT apply to water?
(A) molecule
(B) compound
(C) ionic bonding
(D) covalent bonding
8. Solutions that contain concentration of [H+] higher than pure water
(A) have pH values above 7.
(C) are acids.
(B) are bases.
(D) are enzymes.
9. Which of the following is NOT a monomer?
(A) a glucose molecule
(B) an amino acid
(C) a nucleotide
(D) a protein
10. The shape of a protein is primarily determined by
(A) its size
(B) its amino acid type and sequence
(C) its location in the cell
(D) none of the above
11. Ice floats on water because
(A) water shrinks when it freezes
(B) water expands when it freezes
(C) ice has a higher density than water
(D) of cohesion
12. Which of the following is NOT a property of water that is explained by its polarity?
(A) a high heat of vaporization
(C) solvent for hydrophobic compounds
(B) high surface tension
(D) floats as a solid
13. When salt is dissolved in water, water is the
(A) solvent.
(B) reactant.
(C) solute.
(D) solution.
14. A lipid is composed of the elements carbon, oxygen, and
(A) alcohol
(C) phosphorus
(B) glycerol
(D) hydrogen
15. Glucose can be described as
(A) a monomer
(B) a polymer
(C) lipid
(D) protein
16. The main source from which both plants and animals get their energy is the
monosaccharide:
(A) fructose
(C) galactose
(B) sucrose
(D) glucose
17. At one end of a fatty acid one would find a(n)
(A) amino group
(B) phosphate group
(C) ion
(D) carboxyl group
18. Which of the biomolecules is most used for short-term energy storage and the most usable
energy source?
(A) carbohydrates
(C) proteins
(B) lipids
(D) enzymes
19. Which of the following statements about enzymes is NOT true?
(A) Enzymes work best at a specific pH.
(B) All enzymes have the same shape as their substrates.
(C) Enzymes are proteins.
(D) The shape of an enzyme allows it to do its job.
20. Which of the biomolecules is most used for long-term energy storage, cushioning and
protecting internal organs?
(A) carbohydrates
(C) proteins
(B) lipids
(D) enzymes
21. Identify the reactant(s) in the chemical reaction, CO2 + H2O → H2CO3
(A) CO2, H2O, and H2CO3
(C) H2CO3
(B) CO2 and H2O
(D) CO2
22. 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.
23. Enzymes affect the reactions in living cells by changing the
(A) products of the reaction.
(C) temperature of the reaction.
(B) speed of the reaction.
(D) pH of the reaction.
24. Which of the following statements about a compound is TRUE?
(A) The physical and chemical properties of a compound are usually the same as those of
the elements from which it is formed.
(B) Only the chemical properties of a compound are usually the same as those of the
elements from which it is formed.
(C) Only the physical 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 very different from
those of the elements from which it is formed.
25. What type of electrons is available to form bonds?
(A) covalent
(C) ionic
(B) valence
(D) nucleic
SHORT ESSAY QUESTIONS
26. Identify THREE properties of water and explain – in detail – how they are crucial to living
things. (10 pts)
27. (A) List the TWO types of triglycerides (fat molecules). (B) Explain – in detail – what
accounts for the difference in their physical form (at room temperature). (3 pts)
28. (A) What is an enzyme? (B) Explain – in detail – how enzymes act as catalysts in
chemical reactions. (4 pts)
29. Identify and contrast the two different types of chemical reactions in the diagrams below. (3
pts)
30. (a) Briefly explain how carbohydrates, proteins, nucleic acids and lipids are
synthesized. (B) List at least TWO functions for each type of biomolecules. (10 pts)