PreAP – Biochemistry Test

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PreAP – Biochemistry Test
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 1.
All organic compounds contain the element
a.
 C.
c.
 Ca.
b.
 N.
d.
 Na.
 2.
Carbon is different from many other elements in that
a.
 it has four electrons in its outermost energy level.
b.
 it readily bonds with other carbon atoms.
c.
 it can form single, double, or triple bonds with other atoms.
d.
 All of the above
 3.
Which of the following is not true of alcohols?
a.
 They contain a hydroxyl group (–OH).
b.
 They are polar molecules.
c.
 They can affect processes in living things, either positively or negatively.
d.
 They are the only kind of functional group in organic molecules that contains oxygen.
 4.
The formation of ADP and inorganic phosphate from ATP and water is an example of which kind of reaction?
a.
 condensation
c.
 hydrolysis
b.
 polymerization
d.
 oxidation
 5.
Which of the following is a carbohydrate?
a.
 DNA
c.
 wax
b.
 insulin
d.
 sucrose
 6.
Which organic molecule below is classified as a carbohydrate?
a.
 amino acid
c.
 nucleotide
b.
 CH2 chain
d.
 sugar
 7.
Animals store glucose in the form of
a.
 cellulose.
c.
 wax.
b.
 glycogen.
d.
 lipids.
 8.
Polysaccharides are
a.
 carbohydrates.
c.
 proteins.
b.
 lipids.
d.
 unsaturated fats.
 9.
All of the following are examples of carbohydrates except
a.
 sugar.
c.
 steroids.
b.
 cellulose.
d.
 glycogen.
 10.
Amino acids are monomers of
a.
 disaccharides.
c.
 nucleotides.
b.
 proteins.
d.
 steroids.
 11.
Which organic molecule below is most closely related to proteins?
a.
 amino acids
c.
 nucleotides
b.
 CH2 chains
d.
 sugars
 12.
Long chains of amino acids are found in
a.
 carbohydrates.
c.
 proteins.
b.
 lipids.
d.
 sugars.
 13.
mc013-1.jpg

Refer to the illustration above. Molecules like molecule 2 are found in

a.
 carbohydrates.
c.
 nucleic acids.
b.
 lipids.
d.
 proteins.
 14.
Lipids are
a.
 polar molecules.
c.
 protein molecules.
b.
 similar to water molecules.
d.
 nonpolar molecules.
 15.
All of the following are examples of lipids except
a.
 saturated fats.
c.
 cholesterol.
b.
 starch.
d.
 earwax.
 16.
Saturated fatty acids contain
a.
 carbon atoms that are each bonded to four other atoms.
b.
 carbon atoms linked by double bonds.
c.
 no carboxyl (–COOH) groups.
d.
 more than 100 carbon atoms.
 17.
Lipids are soluble in
a.
 water.
c.
 oil.
b.
 salt water.
d.
 All of the above
 18.
Which organic molecule below is most closely related to lipids?
a.
 amino acids
c.
 nucleotides
b.
 CH2 chains
d.
 sugars
 19.
Which organic molecule below is most closely related to nucleic acids?
a.
 amino acids
c.
 nucleotides
b.
 CH2 chains
d.
 sugars
 20.
Nucleic acids include
a.
 chlorophyll and retinal.
b.
 DNA and RNA.
c.
 lipids and sugars.
d.
 glucose and glycogen.
 21.
Energy is released when the bond between
a.
 carbon atoms in ATP is broken.
b.
 ribose and adenine in ATP is broken.
c.
 phosphate groups in ATP is broken.
d.
 two ATP molecules is broken.
 22.
A model of enzyme action is the
a.
 induced fit model.
c.
 activator action model.
b.
 lipid bilayer model.
d.
 active site model.
 23.
All of the following are functional groups except
a.
 a hydroxyl group.
c.
 a carboxyl group.
b.
 an amino group.
d.
 a carbonate group.
 24.
A phospholipid molecule contains all of the following except
a.
 two fatty acids.
c.
 a phosphate group.
b.
 three fatty acids.
d.
 glycerol.
 25.
Without enzymes, the chemical reactions in the body would
a.
 happen too fast.
b.
 occur at much the same rate as they do with enzymes.
c.
 require a different pH.
d.
 occur too slowly to support life processes.
 26.
Carbon atoms can bond together to form all of the following except
a.
 ring structures.
c.
 straight chain structures.
b.
 inorganic structures.
d.
 branched structures.
 27.
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.
 28.
A monosaccharide is a
a.
 carbohydrate.
c.
 nucleic acid.
b.
 lipid.
d.
 protein.
 29.
Which of the following organic compounds is the main source of energy for living things?
a.
 carbohydrates
c.
 nucleic acids
b.
 lipids
d.
 proteins
 30.
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
 31.
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.
 32.
Which of the following statements about enzymes is NOT true?
a.
 Enzymes work best at a specified pH.
b.
 All enzymes work inside cells.
c.
 Enzymes are proteins.
d.
 Enzymes are organic catalysts.
 

Problem
 33.

You are given four test tubes containing purified biological macromolecules. The test tubes are unlabeled except for a number between 1 and 4. You are told that one test tube contains a protein, one contains a lipid, one contains a carbohydrate, and one contains a nucleic acid. You then perform some tests on the macromolecules and collect the following information:

1)      Test tubes #2 and #4 contain nitrogen, but the other tubes do not.
2)      The contents of test tube #3 are not soluble in water, but the contents of the other test tubes are soluble in water.
3)      The contents of test tube #1 can be broken down into subunits that are all exactly identical to each other.
4)      The macromolecule in test tube #2 is found to have a globular shape.

What are the identities of the macromolecules present in the four test tubes? Write your answer in the space below.


        
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