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Biology Laboratory Manual, 6/e
Darrell S. Vodopich, Baylor University
Randy Moore, University of Minnesota--Minneapolis

Exercise 5-Biologically Important Molecules

Choose the one answer that best answers the question.



1

In a controlled experiment, what is the substance to be identified?
A)the unknown
B)the positive control
C)the negative control
D)the carbohydrate
2

In a controlled experiment, what is the best definition of the function of the positive control?
A)It is the substance to be identified.
B)It provides a standard for comparison.
C)It reacts positively and demonstrates the test's ability to detect what you expect.
D)It shows what a negative result will look like.
3

Why are positive and negative controls important in an experiment?
A)They really aren't important.
B)They show what a result will look like if the results are positive.
C)They show what a result will look like if the results are negative.
D)They show the specificity of the experiment.
4

At the molecular level, what makes lipids, carbohydrates, proteins, and nucleic acids different from each other?
A)They all vary in their amount of inorganic atoms.
B)The types of covalent bonds in each type of molecule.
C)The elements which make up each molecule.
D)Their ability to link subunits into larger macromolecules.
5

What is removed from monosaccharides to produce polysaccharides?
A)water
B)nitrogen
C)starch
D)amino acid
6

What is the positive indication for a substance's reaction with Benedict's reagent?
A)The substance turns reddish orange in color.
B)The substance turns bluish black in color.
C)The substance turns violet in color.
D)The substance turns paper translucent.
7

Exactly what part of the protein molecule is identified by a Biuret test?
A)the carboxyl group
B)the amino group
C)the peptide bond
D)number of hydrogen atoms
8

In what way are lipids different than proteins, carbohydrates, and nucleic acids?
A)Lipids are able to link their subunits into macromolecules.
B)Lipids have nitrogen.
C)Lipids are commonly used to form enzymes.
D)Lipids are nonpolar.
9

Which of the following best explains why animals store energy in the form of lipids?
A)Lipids supply a large amount of calories.
B)Lipids are tiny molecules and therefore lighter.
C)Lipids are very polar and easily dissolved in water.
D)Lipids can easily link subunits into macromolecules.
10

What is the main difference between DNA and RNA?
A)DNA contains nitrogen.
B)DNA contains the sugar deoxyribose.
C)RNA does not react with acids.
D)RNA contains a carboxyl group.








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