MBIO 3400 TTU FINAL with complete
answers A+ passed
The bacterial chromosome is - correct answer ✔✔both circular and found in a
nucleotide
The metabolic processes called fermentation - correct answer ✔✔use an organic
molecule as a final electron acceptor
The gram stain works because of differences in the ________ of bacteria - correct
answer ✔✔cell walls
Bacterial cell walls are composed of - correct answer ✔✔peptidoglycan
Some bacteria have an outer layer composed of ______ that protects them from
desiccation and allows them to adhere to surfaces - correct answer ✔✔either
polypeptides or polysaccharides
A microbe that grows only at the bottom of a tube of thioglycollate medium is
probably a - correct answer ✔✔obligate anaerobe
High resolution images of the internal structures of microbial cells are obtained
using _______ microscopes - correct answer ✔✔transmission electron
Anabolic reactions may be characterized as - correct answer ✔✔forming large
molecules from smaller molecules
,Which of the following types of radiation causes the formation of damaging
chemical bonds in DNA? - correct answer ✔✔Ultraviolet light
__________ designed the swan neck flask experiment and disproved spontaneous
generation - correct answer ✔✔Louis Pasteur
The horizontal transfer process known as transduction - correct answer
✔✔involves a virus or bacteriophage
Antoni van Leeuwenhoek was the first person in history to - correct answer
✔✔view microorganisms and record these observations
The process indicated by the arrow in figure 7.1 most likely represents - correct
answer ✔✔lagging strand synthesis
Which of the following causes mutations by creating thymine dimers? - correct
answer ✔✔ultraviolet light
Air can be disinfected using - correct answer ✔✔both HEPA filters and ultraviolet
light
Lipids found in the membranes of most eukaryotic cells are - correct answer
✔✔phospholipids
Which of the following is an accurate description of viruses? - correct answer
✔✔They are acellular obligatory parasites
,Changes in temperature or pH can cause enzymes to lose activity. What is a
common feature of these two effects? - correct answer ✔✔Temperature and pH
both induce an enzyme to lose its precise three-dimensional shape
Semiconservative DNA replication means that - correct answer ✔✔each daughter
DNA molecule is composed of one original strand and one new strand
If a microbiology lab student left the safranin out of the Gram stain procedure,
what would be the result? - correct answer ✔✔Gram-positive cells would be
purple and Gram-negative cells would be colorless.
A microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the
generation time of the species is 1 hour, and there is no lag phase, how long will it
be before the culture contains more than 500 cells/ml? - correct answer ✔✔3
hours.
# of bacteria per mm3 x 1000 = # of bacteria per cm3 (mL)
You open a jar that has been in the refrigerator for a couple of weeks and find the
contents do not look or smell right. What type of microbe has been growing in
your refrigerator? - correct answer ✔✔Psychrophile
The use of lysozyme during the preparation of cheeses and wines is effective in
reducing the numbers of - correct answer ✔✔Bacteria
, Which of the following is/are common to the light-dependent reactions of
photosynthesis? - correct answer ✔✔Both electron transport and a proton
gradient
Microorganisms characterized by the absence of a nucleus are called - correct
answer ✔✔Prokaryotes
Which of the following is bacteriostatic? - correct answer ✔✔Freezing below 0C
Which of the following is not a macromolecule or polymer? - correct answer
✔✔Salt
A cell that uses an organic carbon source and obtains energy from light would be
called a - correct answer ✔✔Photoheterotroph
Which of the following prokaryotic cells contain an outer membrane - correct
answer ✔✔Gram-negative bacteria only
Which of the following bacterial cell structures plays an important role in the
creation of biofilms - correct answer ✔✔Both fimbriae and glycocalyces
Which of the following statements concerning fimbriae is true - correct answer
✔✔Bacteria use fimbriae to attach to surfaces
Unstained cells that lack pigment are best observed on the _______ microscope -
correct answer ✔✔Phase-contrast
answers A+ passed
The bacterial chromosome is - correct answer ✔✔both circular and found in a
nucleotide
The metabolic processes called fermentation - correct answer ✔✔use an organic
molecule as a final electron acceptor
The gram stain works because of differences in the ________ of bacteria - correct
answer ✔✔cell walls
Bacterial cell walls are composed of - correct answer ✔✔peptidoglycan
Some bacteria have an outer layer composed of ______ that protects them from
desiccation and allows them to adhere to surfaces - correct answer ✔✔either
polypeptides or polysaccharides
A microbe that grows only at the bottom of a tube of thioglycollate medium is
probably a - correct answer ✔✔obligate anaerobe
High resolution images of the internal structures of microbial cells are obtained
using _______ microscopes - correct answer ✔✔transmission electron
Anabolic reactions may be characterized as - correct answer ✔✔forming large
molecules from smaller molecules
,Which of the following types of radiation causes the formation of damaging
chemical bonds in DNA? - correct answer ✔✔Ultraviolet light
__________ designed the swan neck flask experiment and disproved spontaneous
generation - correct answer ✔✔Louis Pasteur
The horizontal transfer process known as transduction - correct answer
✔✔involves a virus or bacteriophage
Antoni van Leeuwenhoek was the first person in history to - correct answer
✔✔view microorganisms and record these observations
The process indicated by the arrow in figure 7.1 most likely represents - correct
answer ✔✔lagging strand synthesis
Which of the following causes mutations by creating thymine dimers? - correct
answer ✔✔ultraviolet light
Air can be disinfected using - correct answer ✔✔both HEPA filters and ultraviolet
light
Lipids found in the membranes of most eukaryotic cells are - correct answer
✔✔phospholipids
Which of the following is an accurate description of viruses? - correct answer
✔✔They are acellular obligatory parasites
,Changes in temperature or pH can cause enzymes to lose activity. What is a
common feature of these two effects? - correct answer ✔✔Temperature and pH
both induce an enzyme to lose its precise three-dimensional shape
Semiconservative DNA replication means that - correct answer ✔✔each daughter
DNA molecule is composed of one original strand and one new strand
If a microbiology lab student left the safranin out of the Gram stain procedure,
what would be the result? - correct answer ✔✔Gram-positive cells would be
purple and Gram-negative cells would be colorless.
A microbiologist inoculates a growth medium with 100 bacterial cells/ml. If the
generation time of the species is 1 hour, and there is no lag phase, how long will it
be before the culture contains more than 500 cells/ml? - correct answer ✔✔3
hours.
# of bacteria per mm3 x 1000 = # of bacteria per cm3 (mL)
You open a jar that has been in the refrigerator for a couple of weeks and find the
contents do not look or smell right. What type of microbe has been growing in
your refrigerator? - correct answer ✔✔Psychrophile
The use of lysozyme during the preparation of cheeses and wines is effective in
reducing the numbers of - correct answer ✔✔Bacteria
, Which of the following is/are common to the light-dependent reactions of
photosynthesis? - correct answer ✔✔Both electron transport and a proton
gradient
Microorganisms characterized by the absence of a nucleus are called - correct
answer ✔✔Prokaryotes
Which of the following is bacteriostatic? - correct answer ✔✔Freezing below 0C
Which of the following is not a macromolecule or polymer? - correct answer
✔✔Salt
A cell that uses an organic carbon source and obtains energy from light would be
called a - correct answer ✔✔Photoheterotroph
Which of the following prokaryotic cells contain an outer membrane - correct
answer ✔✔Gram-negative bacteria only
Which of the following bacterial cell structures plays an important role in the
creation of biofilms - correct answer ✔✔Both fimbriae and glycocalyces
Which of the following statements concerning fimbriae is true - correct answer
✔✔Bacteria use fimbriae to attach to surfaces
Unstained cells that lack pigment are best observed on the _______ microscope -
correct answer ✔✔Phase-contrast
