SDSU BIO 211 EXAM 1- MASTERING
MICRO QUESTIONS & ACTUAL
CORRECT ANSWERS PASSED!
In Pasteur's swan-neck flask experiment, the importance of the S-shaped curves in the flasks
was twofold. The curves allowed entry of air but excluded:
A. heat
B. nutrients
C. airborne bacteria
D. viruses
E. oxygen - correct answer ✔✔C. airborne bacteria
Pasteurization was first developed to kill __________ in wine.
A. spoilage bacteria
B. antibiotic-producing bacteria
C. all bacteria
D. disease-causing bacteria
E. probiotic bacteria - correct answer ✔✔A. spoilage bacteria
All living organisms can be classified into three domains: __________.
A. Eukaryotes, Prokaryotes, and Viruses
B. Animalia, Plantae, and Microbes
,C. Carnivores, Herbivores, and Omnivores
D. Bacteria, Fungi, and Protozoa
E. Bacteria, Archaea, and Eukarya - correct answer ✔✔E. Bacteria, Archaea, and Eukarya
Which of the following is characteristic of bacteria?
A. Bacteria have cellulose or chitin in their cell walls.
B. Bacteria reproduce by a cell-division process known as mitosis.
C. Bacteria have DNA or RNA, but not both.
D. Bacteria live in extreme environments including pH, temperature, and pressure extremes.
E. Bacteria lack a membrane-bound nucleus. - correct answer ✔✔E. Bacteria lack a membrane-
bound nucleus.
All of the following are eukaryotes EXCEPT __________.
A. algae
B. helminths
C. bacteria
D. fungi
E. protozoa - correct answer ✔✔C. bacteria
A new microorganism has been isolated from hot springs in Yellowstone National Park. It
consists of single cells, which appear to lack a nucleus. Chemical analysis shows the presence of
both DNA and RNA in the cytoplasm and pseudomurein in the cell wall. In which of the
following groups will this organism be classified?
A. protists
, B. fungi
C. plants
D. Bacteria
E. Archaea - correct answer ✔✔E. Archaea
In the Gram stain, crystal violet is the __________.
A. mordant
B. counterstain
C. primary stain
D fixative
E. decolorizing agent - correct answer ✔✔C. primary stain
In the Gram stain, crystal violet remains in gram-positive cells after treatment with alcohol
because crystal violet-iodine (CV-I) complexes are trapped __________.
A. in mycolic acid
B. by flagella
C. by endospores
D. in thick layers of peptidoglycan
E. in the outer membrane - correct answer ✔✔D. in thick layers of peptidoglycan
In the Gram stain, if the decolorizing step is deleted, gram-negative cells will appear ________
at the completion of the staining procedure.
A. purple
B. green
MICRO QUESTIONS & ACTUAL
CORRECT ANSWERS PASSED!
In Pasteur's swan-neck flask experiment, the importance of the S-shaped curves in the flasks
was twofold. The curves allowed entry of air but excluded:
A. heat
B. nutrients
C. airborne bacteria
D. viruses
E. oxygen - correct answer ✔✔C. airborne bacteria
Pasteurization was first developed to kill __________ in wine.
A. spoilage bacteria
B. antibiotic-producing bacteria
C. all bacteria
D. disease-causing bacteria
E. probiotic bacteria - correct answer ✔✔A. spoilage bacteria
All living organisms can be classified into three domains: __________.
A. Eukaryotes, Prokaryotes, and Viruses
B. Animalia, Plantae, and Microbes
,C. Carnivores, Herbivores, and Omnivores
D. Bacteria, Fungi, and Protozoa
E. Bacteria, Archaea, and Eukarya - correct answer ✔✔E. Bacteria, Archaea, and Eukarya
Which of the following is characteristic of bacteria?
A. Bacteria have cellulose or chitin in their cell walls.
B. Bacteria reproduce by a cell-division process known as mitosis.
C. Bacteria have DNA or RNA, but not both.
D. Bacteria live in extreme environments including pH, temperature, and pressure extremes.
E. Bacteria lack a membrane-bound nucleus. - correct answer ✔✔E. Bacteria lack a membrane-
bound nucleus.
All of the following are eukaryotes EXCEPT __________.
A. algae
B. helminths
C. bacteria
D. fungi
E. protozoa - correct answer ✔✔C. bacteria
A new microorganism has been isolated from hot springs in Yellowstone National Park. It
consists of single cells, which appear to lack a nucleus. Chemical analysis shows the presence of
both DNA and RNA in the cytoplasm and pseudomurein in the cell wall. In which of the
following groups will this organism be classified?
A. protists
, B. fungi
C. plants
D. Bacteria
E. Archaea - correct answer ✔✔E. Archaea
In the Gram stain, crystal violet is the __________.
A. mordant
B. counterstain
C. primary stain
D fixative
E. decolorizing agent - correct answer ✔✔C. primary stain
In the Gram stain, crystal violet remains in gram-positive cells after treatment with alcohol
because crystal violet-iodine (CV-I) complexes are trapped __________.
A. in mycolic acid
B. by flagella
C. by endospores
D. in thick layers of peptidoglycan
E. in the outer membrane - correct answer ✔✔D. in thick layers of peptidoglycan
In the Gram stain, if the decolorizing step is deleted, gram-negative cells will appear ________
at the completion of the staining procedure.
A. purple
B. green
