Microbiology 020 - General Microbiology » Fall 2021 » Exam 2
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Question #1
The _____ of the microscope holds and allows selection of the objective lenses.
A.
stage
B.
objective
C.
nosepiece
D.
condenser
E.
ocular
Question #2
The site(s) for most ATP synthesis in bacterial cells is(are) the _______.
A.
cell membrane
B.
mitochondria
C.
ribosomes
D.
cell wall
E.
inclusions
Question #3
Peptidoglycan is a unique macromolecule found in bacterial _______.
A.
slime layers
B.
cell membranes
C.
cell walls
D.
capsules
E.
inclusions
Question #4
In eukaryotic cells, ribosomes have two locations: scattered in the ________ and on the surface of the _________.
A.
cytoplasm; endoplasmic reticulum
B.
nucleus; endoplasmic reticulum
C.
cytoplasm; Golgi apparatus
D.
nucleus; Golgi apparatus
Question #5
A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?
A.
The microbiologist used too much inoculum.
B.
The culture is contaminated.
C.
The culture medium must be selective.
D.
The incubation temperature was incorrect.
E.
The culture medium must be differential.
Question #6
Mitochondria possess all of the following except ________.
A.
enzymes for photosynthesis
B.
70S ribosomes (prokaryote)
C.
cristae
D.
electron transport chain proteins
E.
enzymes for metabolism
Question #7
Which of the features listed below is not found in all cells?
A.
Cytoplasmic membrane
B.
Nucleus
C.
Ribosomes
D.
DNA
Question #8
What part of a phospholipid forms hydrophobic tails?
A.
Alcohol
B.
Fatty acids
C.
Phosphate
D.
Glycerol
E.
All of the choices are correct.
Question #9
Which of the following is not a function of the eukaryote glycocalyx?
A.
Protection
B.
Reception of chemical signals
C.
Movement
D.
All of the choices are functions.
E.
Adherence
Question #10
Spirochetes have a twisting and flexing locomotion due to appendages called _______.
A.
cilia
B.
sex pili
C.
flagella
D.
periplasmic flagella (axial filaments)
E.
fimbriae
Question #11
A fat is called ______ if all carbons of the fatty acid chain are single bonded to two other carbons and two hydrogens.
A.
polyunsaturated
B.
unsaturated
C.
monounsaturated
D.
None of the choices are correct.
E.
saturated
Question #12
Lysozyme is most effective against _______.
A.
gram-negative organisms
B.
archaea
C.
cyanobacteria
D.
gram-positive organisms
E.
mycoplasmas
Question #13
Which of the following is not an inoculating tool?
A.
Petri dish
B.
Swab
C.
Needle
D.
Pipette
E.
Loop
Question #14
The cell's series of tunnel-like membranes functioning in transport and storage are the _______.
A.
lysosomes
B.
mitochondria
C.
endoplasmic reticulum
D.
Golgi apparatus
E.
chloroplasts
Question #15
Which method often results in colonies developing down throughout the agar along with some colonies on the surface?
A.
Spread plate
B.
All of the choices are correct.
C.
Pour plate
D.
Streak plate
E.
None of the choices are correct.
Question #16
Helminths are _____.
A.
bacteria
B.
infectious particles
C.
parasitic worms
D.
molds
E.
protozoa
Question #17
The term that refers to the purposeful addition of microorganisms into a laboratory nutrient medium is _____.
A.
Inoculation
B.
contamination
C.
infection
D.
immunization
E.
isolation
Question #18
When a eukaryotic cell is not undergoing mitosis, the DNA and its associated proteins appear as a visible network of dark fibers called the _____.
A.
nuclear envelope
B.
nucleoplasm
C.
nucleolus
D.
chromatin
E.
nucleosome
Question #19
Which is not a characteristic of fungi?
A.
Have cell walls
B.
Can use a wide variety of nutrients
C.
Photosynthetic
D.
Heterotrophic nutrition
E.
Include single-celled and filamentous forms
Question #20
The cell _______ can be composed of three layers: the cytoplasmic membrane, the cell wall, and the outer membrane.
A.
pathogenic package
B.
envelope
C.
None of the choices is correct.
D.
glycocalyx
E.
slime coat
Question #21
Which of the following is found in eukaryotic cells but not in the cells of bacteria?
A.
Endoplasmic reticulum
B.
Nucleus
C.
All of the choices are correct.
D.
Lysosomes
E.
Mitochondria
Question #22
Protists include ______.
A.
helminths
B.
All of the choices are correct.
C.
algae and protozoa
D.
yeasts and molds
E.
None of the choices are correct.
Question #23
The best definition of endosymbiosis is ________.
A.
A photosynthetic bacterial cell and an aerobic bacterial cell fused to become a larger, eukaryotic cell
B.
A DNA virus, a bacteria and a photosynthetic prokaryote fused to form a nucleus, a chloroplast and a mitochondria
C.
A pre-eukaryotic cell was infected by a prokaryote, and symbiosis between the two cell types gave rise to the modern-day eukaryotic cell
D.
A eukaryotic cell ingested a bacterial cell and the organelles fused producing a larger cell
Question #24
Movement of a cell toward a chemical stimulus is termed _______.
A.
a tumble
B.
negative chemotaxis
C.
positive chemotaxis
D.
negative phototaxis
E.
positive phototaxis
Question #25
A nutrient medium that contains at least one ingredient that is NOT chemically definable would be termed _____.
A.
minimal
B.
synthetic
C.
complex
D.
reducing
E.
enriched
Question #26
The first primitive eukaryotic cells likely evolved from ______.
A.
None of the choices are correct.
B.
archaea
C.
bacteria
D.
prokaryotes
E.
the last common ancestor
Question #27
Which of the following is a unique characteristic of viruses that distinguishes them from the other major groups of microorganisms?
A.
Lack a nucleus
B.
Contain genetic material
C.
Cause human disease
D.
Lack cell structure
E.
Cannot be seen without a microscope
Question #28
The correct microbiological term for the tiny sample of specimen that is put into a nutrient medium in order to produce a culture is the _____.
A.
colony
B.
inoculum
C.
loop
D.
incubator
E.
streak
Question #29
The Gram staining procedure is best described as a(n) _______ staining technique.
A.
simple
B.
flagellar
C.
differential
D.
capsule
E.
acid-fast or Ziehl-Neelson
Question #30
The purpose of staining cells on a microscope slide is to ______.
A.
enlarge the cells
B.
kill them
C.
see motility
D.
secure them to the slide
E.
add contrast in order to see them better
Question #31
Choose the statement that best describes the role of mitochondria.
A.
Contain hydrolytic enzymes to digest macromolecules
B.
Assemble amino acids into polypeptides
C.
Store the genetic information of the cell
D.
Control the transport of materials into and out of the cell
E.
Provide cell with energy through cell respiration
Question #32
Which term is not used to describe bacterial cell shapes?
A.
Coccus
B.
Vibrio
C.
Rod
D.
Spirochete
E.
Tetrad
Question #33
The group of protozoa that have gliding motility are the _______.
A.
ciliophora
B.
mastigophora
C.
None of the choices are correct.
D.
apicomplexa/sporozoa
E.
amoeba/sarcodina
Question #34
Agar is a complex polysaccharide that comes from a(n) _____.
A.
fungus
B.
green plant
C.
euglena
D.
mold
E.
algae
Question #35
Organic chemicals always have a basic framework of the element _____ bonded to other atoms.
A.
oxygen
B.
phosphorous
C.
hydrogen
D.
nitrogen
E.
carbon
Question #36
Chemotaxis refers to the ability to ________.
A.
move in response to a chemical
B.
None of the choices is correct.
C.
not move in response to a chemical
D.
move in response to light
E.
transport desired molecules into cells
Question #37
A.
glycerol and fatty acids
B.
nucleotides
C.
amino acids
D.
phosphate, glycerol, and fatty acids
E.
monosaccharides
Question #38
A bacterial cell wall that has primarily peptidoglycan with small amounts of teichoic acid and lipoteichoic acid is _______.
A.
acid fast
B.
found in archaea
C.
gram-negative
D.
gram-positive
E.
a spheroplast
Question #39
Which of the following does not pertain to endotoxin?
A.
It can stimulate fever in the human body
B.
It can cause septic shock in the human body
C.
It is found in acid-fast bacterial cell walls
D.
It is a specific cell wall lipid
E.
It is involved in typhoid fever and some meningitis cases
Question #40
Purines and pyrimidines are components in the building block units of all _____.
A.
carbohydrates
B.
amino acids
C.
polysaccharides
D.
enzymes
E.
nucleic acids
Question #41
Which of the following are mismatched?
A.
Parasite - obtain nutrients from a living organism to the detriment of that organism
B.
Heterotroph - synthesize organic nutrients using light energy and CO2
C.
Saprobe - obtain nutrients from the remains of dead plants and animals
Question #42
The lipid group that serves as energy storage molecules is _____.
A.
steroids
B.
Triglycerides
C.
prostaglandins
D.
waxes
E.
phospholipids
Question #43
Which of the following is not a benefit of agar as a solid medium?
A.
Holds moisture
B.
Is solid at room temperature
C.
Can be inoculated and poured at a temperature that is not harmful
D.
Is digested by most microbes
E.
Has flexibility
Question #44
The type of microscope in which you would see brightly illuminated specimens against a black background is _____.
A.
phase contrast
B.
bright field
C.
electron
D.
fluorescence
E.
dark field
Question #45
The passageways in the nuclear envelope for movement of substances to and from the nucleus and cytoplasm are called nuclear ________.
A.
chromatin
B.
pores
C.
inclusions
D.
endoplasmic reticulum
E.
histones
Question #46
A.
Protozoan cysts are a survival form that allows them to survive adverse environmental conditions between hosts.
B.
Protozoan cysts are the active, growing stage of the organism.
C.
Protozoan cysts are necessary for the infection of intermediate hosts while the trophozoites are the stage that infects definitive hosts.
D.
Protozoan cysts are a reproductive stage.
Question #47
The enzyme _______, found in tears and saliva, can hydrolyze the bonds in the glycan chains of certain bacterial cell walls.
A.
All of the choices are correct.
B.
peptidase
C.
Lysozyme
D.
None of the choices are correct.
E.
penicillinase
Question #48
The two functions of bacterial appendages are ________.
A.
attachment and protection
B.
energy reactions and synthesis
C.
attachment and motility
D.
motility and slime production
E.
protection and motility
Question #49
There are nine peripheral pairs and one central pair of _______ found inside eukaryotic flagella and cilia.
A.
microtubules
B.
flagella
C.
filaments
D.
Cilia
E.
None of the choices are correct.
Question #50
Most biochemical macromolecules are polymers, which are chains of ______.
A.
electrolytic molecules
B.
hydrogen bonds
C.
repeating monomers
D.
hydrophobic molecules
E.
repeating carbohydrates
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