Biology Test: Chapter 2, 7 2009-2010
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____1.The first carbon compounds that scientists studied were called _____ compounds because they came from living organisms.
a. / water / c. / homogeneousb. / organic / d. / biological
____2.What are the basic building blocks of proteins?
a. / nucleic acids / c. / amino acidsb. / peptide bonds / d. / glycerol and fatty acids
____3.The various enzymes in our bodies are _____.
a. / lipids / c. / nucleotidesb. / carbohydrates / d. / proteins
____4.Unlike carbohydrates and fats, proteins contain _____.
a. / nitrogen / c. / hydrogenb. / carbon / d. / oxygen
____5.Carbohydrates have a ratio of ___ carbon, ___ hydrogen, and ___ oxygen.
a. / 4:10:4 / c. / 2:1:1b. / 1:2:1 / d. / all of these answers
____6.Your body likes to use these rather than fats because they are easier to burn
a. / lipids / c. / carbohydratesb. / proteins / d. / nucleic acids
____7.Glucose is an example of what type of carbohydrate?
a. / monosaccharide / c. / polysaccharideb. / disaccharide / d. / all of these answers
____8.______helps with contracting muscles.
a. / lipids / c. / carbohydratesb. / proteins / d. / nucleic acids
____9.Steroid is an example of
a. / lipid / c. / carbohydrateb. / protein / d. / nucleic acid
____10.Lipids have a larger portion of the elements ___ and ___ compared to the element ___.
a. / C, O, H / c. / C, H, Ob. / O, H, C / d. / H, O, C
____11.Which of the following molecules are classified as carbohydrates?
a. / amino acids / c. / nucleotidesb. / fats / d. / sugars
____12.All of the following are examples of lipids except
a. / oil. / c. / steroids.b. / starch. / d. / candle wax.
____13.The molecule on which an enzyme acts is called a(n)
a. / active site. / c. / polar molecule.b. / inactive site. / d. / substrate.
____14.An enzyme
a. / is used up in a reaction.b. / raises the activation energy of a reaction.
c. / bonds with an active site on a substrate molecule.
d. / lowers the activation energy of a reaction.
____15.Which element is found in proteins but not carbohydrates or lipids?
a. / C / c. / Nb. / H / d. / O
____16.When the substrate fits into the enzyme they mold together to start a reaction and then form a product. This is called
a. / lock and key model / c. / fluid mosaic modelb. / induced fit model / d. / none of these
____17.A solution with a pH of 11 is
a. / acidic / c. / neutralb. / basic / d. / a buffer
____18.Acidic solutions have a pH that is
a. / less than 7 / c. / a negative numberb. / between 0 and 14 / d. / more than 7
____19.All organic compounds contain the element
a. / C / c. / Cab. / N / d. / Na
____20.Which of the following is a carbohydrate?
a. / DNA / c. / waxb. / insulin / d. / sucrose
____21.Polysaccharides are
a. / carbohydrates / c. / proteinsb. / lipids / d. / unsaturated fats
____22.Without enzymes, the chemical reactions in the body would
a. / happen too fast / c. / require a different pHb. / occur at the same rate / d. / occur too slowly
____23.What is the process that changes one set of chemicals into another set of chemicals?
a. / cohesion / c. / chemical reactionb. / adhesion / d. / dissolving
____24.What is the term used to describe the energy needed to get a reaction started?
a. / adhesion energy / c. / cohesion energyb. / activation energy / d. / chemical energy
____25.A carbohydrate energy storage molecule found in animal liver and muscle cells is
a. / starch / c. / celluloseb. / glycogen / d. / a fatty acid
____26.A substance that speeds up the rate of a chemical reaction is called a(n)
a. / catalyst / c. / moleculeb. / lipid / d. / element
Figure 6-3
____27.Consider the energy diagram for a chemical reaction in Figure 6-3. Overall, is energy released or absorbed?
a. / absorbed, because the energy level increases during the reactionb. / absorbed, because the energy level of the products is greater than that of the reactants
c. / released, because the reaction is initiated by the addition of heat
d. / released because the energy level of the reactants is greater than that of the products
____28.How does an enzyme influence a biological reaction?
a. / It increases the net energy difference between reactants and products.b. / It decreases the activation energy necessary to initiate the chemical change.
c. / It increases the kinetic energy of reactants, thereby increasing their tendency to collide.
d. / It decreases the kinetic energy of reactants, enabling them to undergo chemical change more easily.
____29.Amino acids are the building blocks of which macromolecule?
a. / carbohydrate / c. / lipidb. / DNA / d. / protein
____30.An organism’s genetic information is stored in which type of macromolecule?
a. / DNA / c. / lipidb. / carbohydrate / d. / protein
____31.Triglyceride is an example of
a. / lipid / c. / carbohydrateb. / protein / d. / nucleic acid
____32.The site on an enzyme where a substrate fits is called
a. / substrate / c. / active siteb. / denature / d. / lock and key
____33.An atom present in all living organisms is
a. / nitrogen / c. / oxygenb. / hydrogen / d. / carbon
____34.Glucose is an example of a
a. / monosaccharide / c. / polysaccharideb. / disaccharide / d. / all of the above
____35.When an enzyme becomes denatured
a. / the substrate will fit into the enzyme and cause a reactionb. / the substrate will not fit into the enzyme and cause a reaction
c. / the substrate will fit into the enzyme and not cause a reaction
d. / the substrate will not fit into the enzyme and not cause a reaction
Biology Test: Chapter 2, 7 2009-2010
Answer Section
MULTIPLE CHOICE
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