MICROBIOLOGY EXAM 1 QUESTIONS WIH
VERIFIED SOLUIONS NEW MODIFIED GRADED A+
What would be an unexpected consequence of changing one amino acid in a
protein consisting of 325 amino acids? --CORRECT ANSWER--A, B, and C
are correct.
Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is
the hydroxyl ion concentration of this lake? --CORRECT ANSWER--1 × 10-10
mol of hydroxyl ion per liter of lake water
To achieve isolation of microorganisms you would want to inoculate the
organisms on to ____________ media. --CORRECT ANSWER--Solid
After incoulating microbes on to sterile media what is the next logical step in
the culturing process? --CORRECT ANSWER--incubation
Media created from an extract of sheep kidneys would best be classified as a
______ media. --CORRECT ANSWER--complex
Media that contains chemicals that will inhibit all bacteria except for a few
types is called _______ media. --CORRECT ANSWER--selective
Page 1 of 70
,What are the two characteristics that contribute to a microscope lens having
good resolving power? --CORRECT ANSWER--the lenses ability to gather
light and the wavelength of light
This type of microscopy would likely be the best for observing the nuclei in
unstained preparations of eukaryotic microorganisms? --CORRECT ANSWER-
-phase contrast microscopy
The flagella in bacteria would be critical in carrying out which of these
functions? --CORRECT ANSWER--chemotaxis
Match the bacterial cell structure on the left with its primary function on the
right: Flagella --CORRECT ANSWER--chemotaxis
Match the bacterial cell structure on the left with its primary function on the
right: Pilus --CORRECT ANSWER--transfer of DNA from cell to cell
Match the bacterial cell structure on the left with its primary function on the
right: Capsule --CORRECT ANSWER--blocks phagocytosis by white blood
cells
Match the bacterial cell structure on the left with its primary function on the
right: Fimbriae --CORRECT ANSWER--adhesion
Page 2 of 70
,Gram (-) bacteria have a thin layer of ____________ between two layers of
membrane. --CORRECT ANSWER--Peptidoglycan
Which of the following best describes the flow of information in eukaryotic
cells? --CORRECT ANSWER--DNA → RNA → proteins
All of the following contain amino acids except:
antibodies.
hemoglobin.
insulin.
enzymes.
cholesterol. --CORRECT ANSWER--cholesterol
In the double helix structure of nucleic acids, cytosine hydrogen bonds to --
CORRECT ANSWER--guanine
What is the pH of a solution with a hydroxyl ion [OH-] concentration of 10-
12M? --CORRECT ANSWER--pH 2 (I think this is supposed to be 12?)
What is the pH of a solution with a hydrogen ion [H+] concentration of 10-8M?
--CORRECT ANSWER--pH 8
Page 3 of 70
, What is true of both starch and cellulose? --CORRECT ANSWER--They are
both polymers of glucose.
The function of each protein is a consequence of its specific shape. What is the
term used for a change in a protein's three-dimensional shape or conformation
due to disruption of hydrogen bonds, disulfide bridges, or ionic bonds? --
CORRECT ANSWER--denaturation
A given solution contains 0.0001(10-4) moles of hydrogen ions [H+] per liter.
Which of the following best describes this solution? --CORRECT ANSWER--
acidic: H+ donor
Polysaccharides, lipids, and proteins are similar in that they --CORRECT
ANSWER--are synthesized from monomers by dehydration reactions.
Humans can digest starch but not cellulose because --CORRECT ANSWER--
humans have enzymes that can hydrolyze the alpha (α) glycosidic linkages of
starch but not the beta (β) glycosidic linkages of cellulose.
Hydrophobic substances such as vegetable oil are --CORRECT ANSWER--
nonpolar substances that repel water molecules.
Which of the following descriptions best fits the class of molecules known as
nucleotides? --CORRECT ANSWER--a nitrogenous base, a phosphate group,
and a pentose sugar
Page 4 of 70
VERIFIED SOLUIONS NEW MODIFIED GRADED A+
What would be an unexpected consequence of changing one amino acid in a
protein consisting of 325 amino acids? --CORRECT ANSWER--A, B, and C
are correct.
Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is
the hydroxyl ion concentration of this lake? --CORRECT ANSWER--1 × 10-10
mol of hydroxyl ion per liter of lake water
To achieve isolation of microorganisms you would want to inoculate the
organisms on to ____________ media. --CORRECT ANSWER--Solid
After incoulating microbes on to sterile media what is the next logical step in
the culturing process? --CORRECT ANSWER--incubation
Media created from an extract of sheep kidneys would best be classified as a
______ media. --CORRECT ANSWER--complex
Media that contains chemicals that will inhibit all bacteria except for a few
types is called _______ media. --CORRECT ANSWER--selective
Page 1 of 70
,What are the two characteristics that contribute to a microscope lens having
good resolving power? --CORRECT ANSWER--the lenses ability to gather
light and the wavelength of light
This type of microscopy would likely be the best for observing the nuclei in
unstained preparations of eukaryotic microorganisms? --CORRECT ANSWER-
-phase contrast microscopy
The flagella in bacteria would be critical in carrying out which of these
functions? --CORRECT ANSWER--chemotaxis
Match the bacterial cell structure on the left with its primary function on the
right: Flagella --CORRECT ANSWER--chemotaxis
Match the bacterial cell structure on the left with its primary function on the
right: Pilus --CORRECT ANSWER--transfer of DNA from cell to cell
Match the bacterial cell structure on the left with its primary function on the
right: Capsule --CORRECT ANSWER--blocks phagocytosis by white blood
cells
Match the bacterial cell structure on the left with its primary function on the
right: Fimbriae --CORRECT ANSWER--adhesion
Page 2 of 70
,Gram (-) bacteria have a thin layer of ____________ between two layers of
membrane. --CORRECT ANSWER--Peptidoglycan
Which of the following best describes the flow of information in eukaryotic
cells? --CORRECT ANSWER--DNA → RNA → proteins
All of the following contain amino acids except:
antibodies.
hemoglobin.
insulin.
enzymes.
cholesterol. --CORRECT ANSWER--cholesterol
In the double helix structure of nucleic acids, cytosine hydrogen bonds to --
CORRECT ANSWER--guanine
What is the pH of a solution with a hydroxyl ion [OH-] concentration of 10-
12M? --CORRECT ANSWER--pH 2 (I think this is supposed to be 12?)
What is the pH of a solution with a hydrogen ion [H+] concentration of 10-8M?
--CORRECT ANSWER--pH 8
Page 3 of 70
, What is true of both starch and cellulose? --CORRECT ANSWER--They are
both polymers of glucose.
The function of each protein is a consequence of its specific shape. What is the
term used for a change in a protein's three-dimensional shape or conformation
due to disruption of hydrogen bonds, disulfide bridges, or ionic bonds? --
CORRECT ANSWER--denaturation
A given solution contains 0.0001(10-4) moles of hydrogen ions [H+] per liter.
Which of the following best describes this solution? --CORRECT ANSWER--
acidic: H+ donor
Polysaccharides, lipids, and proteins are similar in that they --CORRECT
ANSWER--are synthesized from monomers by dehydration reactions.
Humans can digest starch but not cellulose because --CORRECT ANSWER--
humans have enzymes that can hydrolyze the alpha (α) glycosidic linkages of
starch but not the beta (β) glycosidic linkages of cellulose.
Hydrophobic substances such as vegetable oil are --CORRECT ANSWER--
nonpolar substances that repel water molecules.
Which of the following descriptions best fits the class of molecules known as
nucleotides? --CORRECT ANSWER--a nitrogenous base, a phosphate group,
and a pentose sugar
Page 4 of 70
