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Micro 3,4,5 Practice Quiz Questions
Terms in this set (60)
Thiomargarita namibiensis is a notable microbe for which of the following reasons?
A. It is a eukaryotic cell that is the same size as E. coli.
B. It is the largest prokaryotic microbe ever discovered.
C. It is a prokaryote with a primitive nucleus.
D. It is a eukaryote with a prokaryotic-type flagellum.
It is the largest prokaryotic microbe ever discovered.
Which of the following molecules is not found in eukaryotic cell walls?
The glycocalyx of microbial cells has all of the following functions EXCEPT:
A. it enhances the ability of pathogenic microbes to colonize surfaces.
B. it provides a mechanism of attachment for the microbe.
C. it keeps the microbe from drying out.
D. it enhances destruction of the microbe by immune cells
it enhances destruction of the microbe by immune cells.
Passive transport of molecules that requires specific channel proteins is called ____________________.
C. facilitated diffusion.
D. group translocation
Which of the following organelles is present in both prokaryotic and eukaryotic cells?
B. a nucleus
C. endoplasmic reticulum
Which of the following structures is not present in eukaryotic flagella?
B. basal body
D. All of the above are present in eukaryotic flagella.
Which of the following kinds of molecules would NOT be expected to cross the cytoplasmic membrane by diffusion alone?
A. small molecules
B. electrically charged molecules
C. lipid soluble molecules
D. All of these can cross the membrane by diffusion
electrically charged molecules
All of the following statements concerning peptidoglycan are true EXCEPT:
A. Gram-negative cell walls have an inner and an outer peptidoglycan layer.
B. Peptidoglycan is composed primarily of repeating monosaccharide units.
C. Polypeptide crossbridges contribute to the rigidity of the peptidoglycan molecule.
D. Peptidoglycan is not present in the cell walls of the archaea
Gram-negative cell walls have an inner and an outer peptidoglycan layer.
Which of the following organelles is involved in the degradation of toxic molecules?
B. endoplasmic reticulum
C. Golgi bodies
All of the following are true statements concerning fimbriae EXCEPT:
A. they play an important role in bacterial disease.
B. they are important for bacterial conjugation.
C. they are shorter than flagella or pili.
D. they help bacteria form biofilms
they are important for bacterial conjugation.
Cells engaging in taxis are exhibiting which of the following basic processes of life?
Crenation, the shriveling of cells due to loss of water, occurs when cells are placed in what kind of solution?
Movement of a bacterium toward a chemical substance is called ____________________.
A. positive phototaxis.
B. positive chemotaxis.
C. negative phototaxis.
D. negative chemotaxis.
A reserve deposit of valuable nutrients found in many cells is called a(n)
Which of the following is a true statement concerning flagella?
A. "Runs" and "tumbles" are characteristic of eukaryotic cell movement.
B. Prokaryotic flagella rotate instead of whipping back and forth.
C. Flagellin is a molecule found only in eukaryotic flagella.
D. Prokaryotic flagella have a "9+2" microtubule arrangement
Prokaryotic flagella rotate instead of whipping back and forth.
The endosymbiotic theory is one possible explanation for the origin of which of the following organelles?
C. Golgi bodies
The cytoplasmic membrane ____________________.
A. is composed primarily of phospholipids and proteins.
B. incorporates water molecules into its structure, as defined by the fluid mosaic model.
C. allows molecules of all types to pass freely.
D. All of the above are correct.
is composed primarily of phospholipids and proteins.
All of the following are true statements concerning bacterial cell walls EXCEPT:
A. Peptidoglycan is composed of NAG, NAM, and amino acids.
B. Gram-positive cell walls contain teichoic acids.
C. Gram-negative cell walls contain Lipid A which can cause severe problems during infections.
D. The periplasmic space is a feature of Gram-positive cell walls.
The periplasmic space is a feature of Gram-positive cell walls.
Which of the following organelles is involved in the production and transport of proteins throughout the cell?
A. smooth endoplasmic reticulum
C. the Golgi body
D. rough endoplasmic reticulum
rough endoplasmic reticulum
All of the following eukaryotic cellular structures contain tubulin microtubules except ____________________.
D. the cytoskeleton
If you wanted to determine if a microorganism fermented a particular carbohydrate, which of the following kinds of tests would you use?
A. biochemical tests
B. phage typing
The limit of useful magnification for a light microscope is ____________________.
Which of the following has the shortest wavelength?
A. violet light
B. an electron beam
C. red light
D. white light
an electron beam
Which of the following combinations would give the best microscopic resolution?
A. Small numerical aperture lens, long wavelength radiation
B. Small numerical aperture lens, short wavelength radiation
C. Large numerical aperture lens, long wavelength radiation
D. Large numerical aperture lens, short wavelength radiation
Large numerical aperture lens, short wavelength radiation
All of the following types of microscope can be used to view living specimens EXCEPT ____________________.
A. an atomic force microscope.
B. a dark-field microscope.
C. an electron microscope.
D. a bright-field microscope
an electron microscope.
The domain, a taxon proposed by Carl Woese, contains or replaces which of the following taxonomic groups?
A. the genus
B. the phylum
C. the kingdom
D. the order
All of the following statements concerning taxonomy are true EXCEPT:
A. Species of asexual organisms are defined as collections of strains.
B. All taxa have Latin names.
C. Each taxon includes all of the taxa above it.
D. The genus name and the specific epithet together are called a binomial
Each taxon includes all of the taxa above it.
All of the following are components of a bright-field compound microscope EXCEPT:
A. the oil immersion objective lens.
B. the phase plate.
C. the condenser lens.
D. the scanning objective lens.
the phase plate.
In microscopy, which of the following plays an important role in visualizing extremely small objects clearly?
A. wavelength of radiation used
B. numerical aperture of the lens
C. contrast between the specimen and its background
D. Both A and C are correct.
E. Answers A, B, and C are correct
Answers A, B, and C are correct.
Put the following units of measurement in order, from largest to smallest:
IV, II, I, III, V
The designation E. coli O157:H7 is a result of which type of microbial identification process?
A. biochemical tests
C. phage typing
Which of the following stains is used for visualizing Mycobacterium?
A. Negative stain
B. Endospore stain
C. Gram stain
D. Acid-fast stain
All of the following are aspects of scanning electron microscopy EXCEPT:
A. Whole specimens can be observed.
B. Specimens must be placed into a vacuum.
C. Scanning electron micrographs typically appear two-dimensional.
D. Secondary electrons are used to visualize the specimen
Scanning electron micrographs typically appear two-dimensional.
Which of the following taxonomic groupings was NOT part of the traditional Linnaean system of classification?
Which of the following types of microscope is being used to examine the relationships between microbes in biofilms on stromatolites?
A. scanning electron
B. transmission electron
D. scanning tunneling
Which of the following is a true statement concerning basic dyes?
A. Eosin is an example of a basic dye.
B. Basic dyes work best at a low pH.
C. Basic dyes are also known as anionic chromophores.
D. Basic dyes are attracted to the negatively-charged surface of cells
Basic dyes are attracted to the negatively-charged surface of cells.
In the Gram stain, crystal violet serves as the ____________________.
A. primary stain.
C. decolorizing agent.
In the Gram stain, which of the reagents actually differentiates between Gram positive and Gram negative cells?
D. Crystal violet
What is the purpose of fixation in smear preparation?
A. It keeps cells from drying out during staining.
B. It attaches cells firmly to the slide's surface.
C. It enables cells to take up more stain.
D. It temporarily keeps cells from growing.
It attaches cells firmly to the slide's surface.
Which of the following staining procedures is useful for visualizing endospores?
C. Osmium tetraoxide
Many vitamins are important for metabolism because they act as ____________________.
All of the following processes are ways in which a cell can use a proton gradient EXCEPT ____________________.
A. active transport.
B. flagellar motion.
C. electron transport.
D. ATP production
All of the following could be considered precursor metabolites EXCEPT ____________________.
All of the following are true statements concerning chlorophyll EXCEPT:
A. A magnesium ion is an integral part of a chlorophyll molecule.
B. Chlorophyll molecules function by absorbing light of various wavelengths.
C. All photosynthetic organisms use the same type of chlorophyll.
D. The active site of a chlorophyll molecule is structurally similar to a cytochrome molecule
All photosynthetic organisms use the same type of chlorophyll.
Which of the following is temporarily formed during an enzymatic reaction?
A. a coenzyme
B. the enzyme-substrate complex
C. a proton gradient
D. activation energy
the enzyme-substrate complex
Dehydrogenation reactions are an example of which of the following?
A. activation reactions
B. oxidation reactions
C. reduction reactions
D. endergonic reactions
The cellular process of linking chemical building blocks together into macromolecules is called ____________________.
All of the following are byproducts of fermentation EXCEPT ____________________.
A. pyruvic acid.
C. acetic acid.
D. lactic acid.
All of the following are electron carrier molecules that are important for cellular redox reactions EXCEPT:
What is the purpose of the Calvin-Benson cycle?
A. the formation of phosphorylated pentose sugars from glucose-6-phosphate
B. the catabolism of glucose to pyruvic acid using enzymes different from those of glycolysis
C. transfer of an amine group from one amino acid to another
D. the production of glyceraldehyde-3-phosphate by fixation of CO2 molecules
the production of glyceraldehyde-3-phosphate by fixation of CO2 molecules
What is the major function of fermentation?
A. The production of ADP
B. The regeneration of NAD+ for glycolysis
C. The generation of a proton gradient
D. The reduction of glucose
The regeneration of NAD+ for glycolysis
Which of the following best describes the function of a photosystem?
A. The absorption of light energy and its conversion to ATP and NADPH
B. The generation of glucose from carbon dioxide and water
C. The generation of NADH and FADH2 from the oxidation of acetyl-CoA
D. The generation of a proton gradient in order to produce ATP
The absorption of light energy and its conversion to ATP and NADPH
Sulfanilamide is a drug which interferes with bacterial enzymes in which of the following ways?
A. competitive inhibition
B. noncompetitive inhibition
C. feedback inhibition
D. end-product inhibition
In eukaryotic cells, all of the following processes occur in the mitochondrion EXCEPT:
A. the Krebs cycle
B. electron transport
Activation energy ____________________.
A. is the same for all chemical reactions.
B. can be achieved by lowering the temperature of a reaction.
C. is the amount of energy it takes to trigger a chemical reaction.
D. is higher in the presence of an enzyme
is the amount of energy it takes to trigger a chemical reaction.
NADH generated during cellular respiration results in the production of how many ATP?
Beta-oxidation is a method of catabolizing which of the following molecules?
B. fatty acids
Changes in pH have an adverse effect on the shape of an enzyme because pH affects which levels of protein structure?
A. Primary structure
B. Secondary structure
C. Tertiary structure
D. Both B and C are correct.
E. A, B, and C are correct.
Both B and C are correct.
All of the following are associated with the process of glycolysis EXCEPT ____________________.
A. production of NADPH.
B. phosphorylation of glucose.
C. substrate-level phosphorylation.
D. production of pyruvic acid
production of NADPH.
Which of the following enzymes might be expected to catalyze the removal or addition of electrons of other molecules?
A. an oxidoreductase
B. a transferase
C. a ligase
D. an isomerase
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