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Microbiology midterm exam 2, Exams of Microbiology

City CollegeMicrobiology

This exam covered the first 7 topics in microbiology

Typology: Exams

2019/2020
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Uploaded on 10/15/2021

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Questions:
1. methicillin resistant staphylococcus aureus frequently causes infections in patients when
it is carried to the hospital environment. How can this microorganism be best classified?
a. Facultative pathogen
2. What is the main structure of the peptidoglycan component of cell walls?
a. Proteins and carbohydrates
3. There are 64 different triplet codes and only 20 diff amino acids, thus, it is expected that
some amino acids are represented...which of the following can explain this fact?
- Redundancy of the code
4. Which of the following pairs of microbe classification terms and optimal growth
temperature.
- growth at 37oc
5. When a bacteria swims towards a chemical it is termed as…
- Positive Chemotaxis
6. The stage in population growth with the highest rate of cell division is the
a. Exponential phase (log phase)
7. Which of the following methods of analyzing population growth is able to measure cell
size and even differentiate between live and dead cells?
a. Turbidimetry
8. Two drugs that affect cell wall synthesis are
a. Vancomycin and cephalosporin
9. Which of the following would not be a portal of entry?
a. The meningitis
10. Resident microbiota is commonly found in the
a. urethra
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Questions:

  1. methicillin resistant staphylococcus aureus frequently causes infections in patients when it is carried to the hospital environment. How can this microorganism be best classified? a. Facultative pathogen
  2. What is the main structure of the peptidoglycan component of cell walls? a. Proteins and carbohydrates
  3. There are 64 different triplet codes and only 20 diff amino acids, thus, it is expected that some amino acids are represented...which of the following can explain this fact? - Redundancy of the code
  4. Which of the following pairs of microbe classification terms and optimal growth temperature. - growth at 37oc
  5. When a bacteria swims towards a chemical it is termed as…
    • Positive Chemotaxis
  6. The stage in population growth with the highest rate of cell division is the a. Exponential phase (log phase)
  7. Which of the following methods of analyzing population growth is able to measure cell size and even differentiate between live and dead cells? a. Turbidimetry
  8. Two drugs that affect cell wall synthesis are a. Vancomycin and cephalosporin
  9. Which of the following would not be a portal of entry? a. The meningitis
  10. Resident microbiota is commonly found in the a. urethra
  1. In the absence of oxygen, yeast cells can obtain energy by fermentation resulting in the production of a. ATP, CO2 and ethanol
  2. Which of the following operons often contain genes coding for anabolic enzymes, such as those used to synthesize amino acids? a. Repressible operons
  3. The most important medical species mycoplasma pneumoniae can be best described as a. Cell wall deficient
  4. Which of the following a bacterium can be used as genetic info? a.
  5. Clostridium perfringens causes a. Food poisoning
  6. Which of the following bacteria was responsible for the bubonic plague? a. Yersinia pestis
  7. The bacterial glycocalyx is synonymous with
    • Capsule

  8. Which of the following is present in a bacterium cell, a plant cell, and an animal cell.

  9. A classic symptom of pertussis is a. Paroxysmal coughing
  10. Tetracyclines are antibacterial drugs that target a. protein synthesis
  11. Which of the following diseases does a gram negative spirochete treponema pallidum microbe cause? a. syphilis
  1. Microbial resistance to drugs is acquired through a. All of these
  2. A bacterium is a(n)_____ organism a. Unicellular, prokaryotic
  3. The cell wall of gram negative bacteria do not contain a. Teichoic Acids
  4. The proton motive force is the result of a. a proton gradient between the matrix and intermembrane space of a mitochondria
  5. In figure, which tube shows the expected growth pattern for a facultative anaerobe? a. B
  6. Which of the statements below is false? a. The genetic code is overlapping
  7. Cytoplasmic membrane and the cell material bounded by it plus the outer membrane of the cell is known as _____.
    • Cell membrane
  8. Which of the following is true for all exergonic reactions?
    • The reaction proceeds with a net release of free energy
  9. Which of the following exhibit endospore formation? -Bacillus anthrax
  10. Naked DNA is incorporated into the bacterial growth through the process of -Transformation
  11. __ have a thinner peptidoglycan layer and lies beneath an additional outer membrane, and it is not stained by the dye
    • Gram- negative bacteria
  12. Mutations that produce neither adverse nor helpful changes are classified as___
  • neutral mutations
  1. Normal resident microbes are absent in the? -Lungs 46 which of the following uses CO2 for carbon and H2 for energy?
  • Chemoautotrophs
  1. How many chromosomes mostly bacteria have inside the cell
  • 1
  1. Which of the virulence factors does streptococcus pyogenes use for the digestion of blood clots and apparently assist in invasion of wounds?
  • Streptokinase
  1. Which of the following components have been found to be unique in nontypical cell wall structure in Mycobacterium and Nocardia?
  • B Mycolic acid
  1. Ringworm, a fungal infection, is well known for the possibility to cause itchy….
  • Ectoparasite
  1. How does a noncompetitive inhibitor decrease the rate of an enzyme reaction?
  • By changing the shape of the enzyme's active site
  1. Which of the following statement is correct about diffusion
  • It is a passive process in which molecule move from a region of higher concentration to a region of lower concentration
  1. Which of these features is found in eukaryotes but not bacteria
  • introns
  1. Which of the following mutations would cause a frameshift mutation? It’s not deletion mutation. (Let’s use process of elimination).
  1. Which kind of plasmids carries genes enabling bacteria to break down specific substances such as toxin chemicals?
    • Metabolic plasmids
  2. Cytoplasmic membrane and the cell material bounded by it plus the outer membrane of cell is known as
    • protoplast
  3. In a viable plate count, each __ represent a __ from the sample population
    • usually colony ,cell
  4. Fluorescent Repthbl Antibody absorption test for
    • syphilis infection
  5. The lac operon is usually in the blank position and is activated by a blank molecule
    • Off, inducer
  6. Which of the following produce pyocyanin a blue green pigment, give off a graphics odor and can cause urinary tract infections
    • Pseudomonas sp.
  7. To degrade antibiotics in its environment a bacterium produces a/an
    • exoenzyme
  8. which part of the outer membrane of gram negative cell envelops is an endotoxins
    • An LPS fraction
  9. Naked DNA is incorporated into the bacterial genome through the process of
    • transformation
  10. The initial investment of energy for starting a reaction- the energy required to contort the reactant molecules so the bonds can break is
    • Activation energy
  11. A conjugated enzyme can also be called as___
    • Holoenzyme
  1. Which of the following are codons for which there is no responding tRNA, also known as termination codons?
    • UAA,UAG,UGA 80.the most common residents of the oral cavity are aerobic_____ species?
    • Streptococcus
  2. The anticodon of a particular tRNA molecule is
    • complementary to the corresponding mRNA codon
  3. Flagella over the entire surface is referred to as
    • peritrichous 85.Pili are appendages in____ bacteria that serve as a means of ____
    • Gram-negative, genetic exchange
  4. Tetracyclines are antibacterial drugs that target
    • protein synthesis
  5. Which of the following prokaryotes lack cell walls
    • Mycoplasma
  6. Which of the following characteristics is not true of plasmids
    • It is required for normal cell function
  7. The rate of cell growth equals rate of cell death caused by depleted nutrients and o extraction of organic acids and pollutants. Which stage in the normal growth curve is it? Stationary phase
  8. Mesophilic bacteria grow well at
    • 20 - 40 degrees Celsius 91.Which of the following microorganisms is seen in the large intestine and can prevent the growth of pathogenic bacteria, such as Salmonella and Shigella?
    • Escherichia coli 92.The specific action of hemolysins is to
  1. which of the following microorganism are involved in creating the normal acidity of pH 4. in the vagina to prevent the overgrowth of pathogenic microbes
- lactobacillus
  1. Micro Inactivate distance to drugs is acquired through
- all of these
  1. which group of microorganisms is most likely to spoil a freshwater trout preserved with salt.
- facultative halophiles
  1. In the presence of which molecule the lactose operon will be deactivated(turned off)
- Monosaccharides, like glucose
  1. Which of the following parts of the gastrointestinal tract harbor permanent microbes?
- Oral cavity, large intestine, rectum
  1. Which of the following drugs inhibits bacteria by blocking folic acid synthesis?
- Sulfonamides
  1. the specific action of hemolysis is to
- damage red blood cells
  1. lactose in the lac operon binds to, and inactivates a repressor molecule
  2. Fermentation of a glucose molecule has the potential to produce a net number of ____ ATPs
- 2
  1. Most enzymes are___
- Proteins
  1. In prokaryotes the respiratory electron transport chain is located____
- In the plasma membrane

116 Which of the following ecological associations among microbes is described as one member benefits other membrane

  • commensalism
  1. Which of the following exhibit endospore formation streptococcus mutans
  2. The compound that enters the Krebs cycle is
  • acetyl coenzyme A
  1. In prokaryotes, the respiratory electron transport chain is located ____
  • in the plasma membrane
  1. In bacteria, a chromosome can be distinguished from a plasmid, because a chromosome is a genetic element that
  • encodes for essential functional genes
  1. Bacteria reproduce by a process known as
  • binary fission
  1. Patients with indwelling catheters (long - term tubes inserted into body orifices for drainage, such as through the urethra and into the urinary bladder) are susceptible to infections because:
  • Biofilms develop on catheters
  1. The etiological cause of meningitis in children is
  • Haemophilus sp. 125 Which of the following is present in a bacterium cell?
  • Ribosome 126 Fluorescent treponemal antibody absorption test (FTA-ABS) tests for a. Syphilis infection 127 Which of the following prokaryotes lack cell walls? a. Mycoplasma
  1. The rate of the cell growth equals the rate of cell death cause by depleted nutrients and Co2, excretion of organic acids and pollutants. Which stage is the normal growth curve is it?
  1. Which of the following microorganism are involved in creating the normal acidity of pH 4. in the vagina to prevent overgrowth of pathogenic microbes? a. Lactobacillus