Straighterline Micro 250 final prep
_____ solution was introduced in the late 19th century for preventing gonococcal infections in a
newborn's eyes after exposure to the mother's infected birth canal.
Select one:
a. Merthiolate
b. Triclosan
c. Betadine
d. Silver nitrate
e. Zinc oxide - ANS -Silver nitrate
\A bacterium that you isolated from pond water appears to use light for energy. Based upon this
information, you inoculate the organism into fresh media, infused with lots of carbon dioxide.
Even after incubation at the correct temperature (of pond water), the organism is not growing.
Your best explanation of what might have happened is
Select one:
a. there was no sulfur compound added to the medium, that could be used as an electron
donor.
b. no oxygen was added to the medium so the organism died.
c. there is some inhibitory chemical that is preventing the growth of the bacterium.
d. you were using the wrong type of sunlight as the energy source for the bacterium. - ANS
-there was no sulfur compound added to the medium, that could be used as an electron donor.
\A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last
Universal Common Ancestor would show Archaea
Select one:
a. as the original cells from which the others derived.
b. branching off the Domain Eukarya.
c. branching off the Domain Bacteria. - ANS -branching off the Domain Eukarya
\A fat is called _____ if all carbons of the fatty acid chain are single-bonded to 2 other carbons
and 2 hydrogens. - ANS -saturated
\A group of protozoa that are not motile are the ______.
Select one:
a. amoebas
b. ciliates
c. trophozoites
d. Plasmodium sp.
e. dimorphics - ANS -Plasmodium sp.
\A microaerophile
Select one:
a. grows best in an anaerobic jar.
b. grows with or without oxygen.
c. needs normal atmospheric levels of oxygen.
, d. requires a small amount of oxygen but won't grow at normal atmospheric levels of oxygen. -
ANS -requires a small amount of oxygen but won't grow at normal atmospheric levels of oxygen.
\A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture
medium. Following incubation, only the E. coli grows in the culture. What is the most likely
explanation?
Select one:
a. The microbiologist used too much inoculum.
b. The culture was contaminated.
c. The incubation temperature was incorrect.
d. The culture medium was selective.
e. The culture medium was differential. - ANS -The culture medium was selective.
\A microbiologist must culture a patient's feces for intestinal pathogens. Which of the following
components would likely be present in a selective medium for this purpose?
Select one:
a. NaCl
b. Sheep red blood cells
c. Bile salts
d. Thioglycolic acid
e. Peptone - ANS -Bile salts
\A microorganism that does not have catalase or superoxide dismutase would find it difficult to
live in an environment with ______.
Select one:
a. carbon dioxide
b. oxygen
c. high salt
d. temperatures above 37° C
e. high acidity - ANS -oxygen
\A mutation that changes a normal codon to a stop codon is called a ______ mutation.
Select one:
a. point
b. silent
c. back
d. missense
e. nonsense - ANS -nonsense
\A nutrient medium that contains at least one ingredient that is not chemically defined is termed
______.
Select one:
a. complex
b. reducing
c. enriched
d. synthetic - ANS -complex
\A nutrient medium that contains at least one ingredient that is not chemically defined is termed
______.
Select one:
, a. complex
b. reducing
c. enriched
d. synthetic - ANS -complex
\A pure culture contains
Select one:
a. only one identified species of microorganism.
b. only bacteria.
c. microbes from a single source.
d. a variety of species from the same genus. - ANS -only one identified species of
microorganism.
\A pure or mixed sample of known microbes added to food is a(n) ______.
Select one:
a. leavening
b. fermenter
c. starter culture
d. flavor inducer
e. aerator - ANS -starter culture
\A reducing medium contains
Select one:
a. sugars that can be fermented.
b. extra oxygen.
c. hemoglobin, vitamins, or other growth factors.
d. substances that remove oxygen.
e. inhibiting agents. - ANS -substances that remove oxygen.
\A reducing medium is used to culture ______ organisms.
Select one:
a. fastidious
b. aerobic
c. anaerobic
d. pathogenic - ANS -anaerobic
\A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working
on
Select one:
a. determining evolutionary relatedness.
b. bioremediation.
c. recombinant DNA.
d. nomenclature.
e. determining if that species is the cause of a new disease - ANS -determining evolutionary
relatedness.
\A screening system called the _______ test is used for detecting chemicals with carcinogenic
potential.
Select one:
a. Koch
, b. Ames
c. mutation
d. cancer
e. Iowa - ANS -Ames
\a spongiform encephalopathy of humans - ANS -Creutzfeldt-Jacob disease
\All cells contain
Select one:
a. ribosomes for protein synthesis.
b. cell walls made of cellulose.
c. uracil in their DNA.
d. organelles for compartmentalization.
e. mitochondria to generate ATP. - ANS -ribosomes for protein synthesis.
\All of the following are associated with IgE and mast-cell-mediated allergy except ______.
Select one:
a. drug allergies
b. eczema
c. anaphylaxis
d. allergic asthma
e. systemic lupus erythematosus - ANS -systemic lupus erythematosus
\All of the following are lipids except ______.
Select one:
a. cholesterol
b. starch
c. phospholipid
d. wax
e. triglyceride - ANS -starch
\All of the following are polysaccharides except
Select one:
a. dextran in some bacterial slime layers.
b. agar used to make solid culture media.
c. a cell's glycocalyx.
d. cellulose in certain cell walls.
e. sterols in cell membranes - ANS -sterols in cell membranes
\All of the following are signs and symptoms of urinary tract infection except ______.
Select one:
a. red blood cells in urine
b. painful urination
c. white blood cells in urine
d. nausea
e. diarrhea - ANS -diarrhea
\All of the following occur during endospore germination except
Select one:
a. dehydration of the cell components.
b. binding of a small organic molecule to initiate germination.
_____ solution was introduced in the late 19th century for preventing gonococcal infections in a
newborn's eyes after exposure to the mother's infected birth canal.
Select one:
a. Merthiolate
b. Triclosan
c. Betadine
d. Silver nitrate
e. Zinc oxide - ANS -Silver nitrate
\A bacterium that you isolated from pond water appears to use light for energy. Based upon this
information, you inoculate the organism into fresh media, infused with lots of carbon dioxide.
Even after incubation at the correct temperature (of pond water), the organism is not growing.
Your best explanation of what might have happened is
Select one:
a. there was no sulfur compound added to the medium, that could be used as an electron
donor.
b. no oxygen was added to the medium so the organism died.
c. there is some inhibitory chemical that is preventing the growth of the bacterium.
d. you were using the wrong type of sunlight as the energy source for the bacterium. - ANS
-there was no sulfur compound added to the medium, that could be used as an electron donor.
\A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last
Universal Common Ancestor would show Archaea
Select one:
a. as the original cells from which the others derived.
b. branching off the Domain Eukarya.
c. branching off the Domain Bacteria. - ANS -branching off the Domain Eukarya
\A fat is called _____ if all carbons of the fatty acid chain are single-bonded to 2 other carbons
and 2 hydrogens. - ANS -saturated
\A group of protozoa that are not motile are the ______.
Select one:
a. amoebas
b. ciliates
c. trophozoites
d. Plasmodium sp.
e. dimorphics - ANS -Plasmodium sp.
\A microaerophile
Select one:
a. grows best in an anaerobic jar.
b. grows with or without oxygen.
c. needs normal atmospheric levels of oxygen.
, d. requires a small amount of oxygen but won't grow at normal atmospheric levels of oxygen. -
ANS -requires a small amount of oxygen but won't grow at normal atmospheric levels of oxygen.
\A microbiologist inoculates Staphylococcus epidermidis and Escherichia coli into a culture
medium. Following incubation, only the E. coli grows in the culture. What is the most likely
explanation?
Select one:
a. The microbiologist used too much inoculum.
b. The culture was contaminated.
c. The incubation temperature was incorrect.
d. The culture medium was selective.
e. The culture medium was differential. - ANS -The culture medium was selective.
\A microbiologist must culture a patient's feces for intestinal pathogens. Which of the following
components would likely be present in a selective medium for this purpose?
Select one:
a. NaCl
b. Sheep red blood cells
c. Bile salts
d. Thioglycolic acid
e. Peptone - ANS -Bile salts
\A microorganism that does not have catalase or superoxide dismutase would find it difficult to
live in an environment with ______.
Select one:
a. carbon dioxide
b. oxygen
c. high salt
d. temperatures above 37° C
e. high acidity - ANS -oxygen
\A mutation that changes a normal codon to a stop codon is called a ______ mutation.
Select one:
a. point
b. silent
c. back
d. missense
e. nonsense - ANS -nonsense
\A nutrient medium that contains at least one ingredient that is not chemically defined is termed
______.
Select one:
a. complex
b. reducing
c. enriched
d. synthetic - ANS -complex
\A nutrient medium that contains at least one ingredient that is not chemically defined is termed
______.
Select one:
, a. complex
b. reducing
c. enriched
d. synthetic - ANS -complex
\A pure culture contains
Select one:
a. only one identified species of microorganism.
b. only bacteria.
c. microbes from a single source.
d. a variety of species from the same genus. - ANS -only one identified species of
microorganism.
\A pure or mixed sample of known microbes added to food is a(n) ______.
Select one:
a. leavening
b. fermenter
c. starter culture
d. flavor inducer
e. aerator - ANS -starter culture
\A reducing medium contains
Select one:
a. sugars that can be fermented.
b. extra oxygen.
c. hemoglobin, vitamins, or other growth factors.
d. substances that remove oxygen.
e. inhibiting agents. - ANS -substances that remove oxygen.
\A reducing medium is used to culture ______ organisms.
Select one:
a. fastidious
b. aerobic
c. anaerobic
d. pathogenic - ANS -anaerobic
\A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working
on
Select one:
a. determining evolutionary relatedness.
b. bioremediation.
c. recombinant DNA.
d. nomenclature.
e. determining if that species is the cause of a new disease - ANS -determining evolutionary
relatedness.
\A screening system called the _______ test is used for detecting chemicals with carcinogenic
potential.
Select one:
a. Koch
, b. Ames
c. mutation
d. cancer
e. Iowa - ANS -Ames
\a spongiform encephalopathy of humans - ANS -Creutzfeldt-Jacob disease
\All cells contain
Select one:
a. ribosomes for protein synthesis.
b. cell walls made of cellulose.
c. uracil in their DNA.
d. organelles for compartmentalization.
e. mitochondria to generate ATP. - ANS -ribosomes for protein synthesis.
\All of the following are associated with IgE and mast-cell-mediated allergy except ______.
Select one:
a. drug allergies
b. eczema
c. anaphylaxis
d. allergic asthma
e. systemic lupus erythematosus - ANS -systemic lupus erythematosus
\All of the following are lipids except ______.
Select one:
a. cholesterol
b. starch
c. phospholipid
d. wax
e. triglyceride - ANS -starch
\All of the following are polysaccharides except
Select one:
a. dextran in some bacterial slime layers.
b. agar used to make solid culture media.
c. a cell's glycocalyx.
d. cellulose in certain cell walls.
e. sterols in cell membranes - ANS -sterols in cell membranes
\All of the following are signs and symptoms of urinary tract infection except ______.
Select one:
a. red blood cells in urine
b. painful urination
c. white blood cells in urine
d. nausea
e. diarrhea - ANS -diarrhea
\All of the following occur during endospore germination except
Select one:
a. dehydration of the cell components.
b. binding of a small organic molecule to initiate germination.
