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Homework answers / question archive / McMaster University BIO 2EE3 CHAPTER 2 1)Which term describes straight, rod-shaped bacteria? Vibrios Pleiomorphs Spirilla Bacilli Cocci   Which region contains the chromosome in the bacterial cell? Nucleus Prophage Plastid Plasmid Nucleoid   How are gas vesicles used by bacterial cells? As a source of nitrogen As a source of oxygen As an energy source As a source of hydrogen For buoyancy   What protein has been shown to play an important role in cell division through the formation of the Z-ring? PepZ FlaA MreB FtsZ ParM   What protein plays an important role in determining cell shape by directing cell wall synthesis in non-spherical bacteria? MreB FlaA ParM FtsZ PepZ   Which one of the following is NOT a key function of the cytoplasmic membrane? Environmental sensing Oxidative electron transport Protein synthesis Nutrient transport Signal transduction   The proton motive force (PMF) across a cell membrane can be used for which of these processes? Generate ATP Propel the flagella Transport molecules out of the cell Transport nutrients into the cell All of the above   What is a signal peptide? A protein used to signal cell division A regulatory protein that turns on/off the expression of certain genes A protein in the cytoplasmic membrane that is used to communicate with other closely related cells The amino acid sequence of a protein that detects changes in the external environment and signals this change to components in the cell A short amino acid sequence on the end of a protein that is used for transport of the protein out of the cell   Which is the major component of the cell wall of microbes in the Bacteria domain? Cellulose Peptidoglycan Chitin Polysaccharide Protein   What is the reaction of β-lactamase enzymes? Hydrolyze lactose to glucose and galactose Inactivate the enzyme lysozyme Inactivate antibiotics like penicillin Hydrolyze the glycan chain of peptidoglycan Prevent the transpeptidation reaction during peptidoglycan synthesis   Which of these is included in the Gram-positive cell envelope? Peptidoglycan, LPS, and lipoteichoic acids Peptidoglycan, LPS, and teichoic acids Peptidoglycan, LPS, and a periplasmic space Peptidoglycan, teichoic acids, and lipoteichoic acids Teichoic acids, lipoteichoic acids, and a periplasmic space   Which of these describes the peritrichous arrangement of flagella? Flagella on a single side of the cell Flagella in a tuft at one end of the cell Flagella at both polar ends of the cell Flagella inside the periplasm wrapping around the cell Flagella all around the cell   Which term describes spherical-shaped bacteria? Pleiomorphs Cocci Vibrios Bacilli Spirilla   The bacterial chromosome is a highly condensed structure that is tightly wound up around itself to fit into the bacterial cell

McMaster University BIO 2EE3 CHAPTER 2 1)Which term describes straight, rod-shaped bacteria? Vibrios Pleiomorphs Spirilla Bacilli Cocci   Which region contains the chromosome in the bacterial cell? Nucleus Prophage Plastid Plasmid Nucleoid   How are gas vesicles used by bacterial cells? As a source of nitrogen As a source of oxygen As an energy source As a source of hydrogen For buoyancy   What protein has been shown to play an important role in cell division through the formation of the Z-ring? PepZ FlaA MreB FtsZ ParM   What protein plays an important role in determining cell shape by directing cell wall synthesis in non-spherical bacteria? MreB FlaA ParM FtsZ PepZ   Which one of the following is NOT a key function of the cytoplasmic membrane? Environmental sensing Oxidative electron transport Protein synthesis Nutrient transport Signal transduction   The proton motive force (PMF) across a cell membrane can be used for which of these processes? Generate ATP Propel the flagella Transport molecules out of the cell Transport nutrients into the cell All of the above   What is a signal peptide? A protein used to signal cell division A regulatory protein that turns on/off the expression of certain genes A protein in the cytoplasmic membrane that is used to communicate with other closely related cells The amino acid sequence of a protein that detects changes in the external environment and signals this change to components in the cell A short amino acid sequence on the end of a protein that is used for transport of the protein out of the cell   Which is the major component of the cell wall of microbes in the Bacteria domain? Cellulose Peptidoglycan Chitin Polysaccharide Protein   What is the reaction of β-lactamase enzymes? Hydrolyze lactose to glucose and galactose Inactivate the enzyme lysozyme Inactivate antibiotics like penicillin Hydrolyze the glycan chain of peptidoglycan Prevent the transpeptidation reaction during peptidoglycan synthesis   Which of these is included in the Gram-positive cell envelope? Peptidoglycan, LPS, and lipoteichoic acids Peptidoglycan, LPS, and teichoic acids Peptidoglycan, LPS, and a periplasmic space Peptidoglycan, teichoic acids, and lipoteichoic acids Teichoic acids, lipoteichoic acids, and a periplasmic space   Which of these describes the peritrichous arrangement of flagella? Flagella on a single side of the cell Flagella in a tuft at one end of the cell Flagella at both polar ends of the cell Flagella inside the periplasm wrapping around the cell Flagella all around the cell   Which term describes spherical-shaped bacteria? Pleiomorphs Cocci Vibrios Bacilli Spirilla   The bacterial chromosome is a highly condensed structure that is tightly wound up around itself to fit into the bacterial cell

Biology

McMaster University

BIO 2EE3

CHAPTER 2

1)Which term describes straight, rod-shaped bacteria?

    1. Vibrios
    2. Pleiomorphs
    3. Spirilla
    4. Bacilli
    5. Cocci

 

  1. Which region contains the chromosome in the bacterial cell?
    1. Nucleus
    2. Prophage
    3. Plastid
    4. Plasmid
    5. Nucleoid

 

  1. How are gas vesicles used by bacterial cells?
    1. As a source of nitrogen
    2. As a source of oxygen
    3. As an energy source
    4. As a source of hydrogen
    5. For buoyancy

 

  1. What protein has been shown to play an important role in cell division through the formation of the Z-ring?
    1. PepZ
    2. FlaA
    3. MreB
    4. FtsZ
    5. ParM

 

  1. What protein plays an important role in determining cell shape by directing cell wall synthesis in non-spherical bacteria?
    1. MreB
    2. FlaA
    3. ParM
    4. FtsZ
    5. PepZ

 

  1. Which one of the following is NOT a key function of the cytoplasmic membrane?
    1. Environmental sensing
    2. Oxidative electron transport
    3. Protein synthesis
    4. Nutrient transport
    5. Signal transduction

 

  1. The proton motive force (PMF) across a cell membrane can be used for which of these processes?
    1. Generate ATP
    2. Propel the flagella
    3. Transport molecules out of the cell
    4. Transport nutrients into the cell
    5. All of the above

 

  1. What is a signal peptide?
    1. A protein used to signal cell division
    2. A regulatory protein that turns on/off the expression of certain genes
    3. A protein in the cytoplasmic membrane that is used to communicate with other closely related cells
    4. The amino acid sequence of a protein that detects changes in the external environment and signals this change to components in the cell
    5. A short amino acid sequence on the end of a protein that is used for transport of the protein out of the cell

 

  1. Which is the major component of the cell wall of microbes in the Bacteria domain?
    1. Cellulose
    2. Peptidoglycan
    3. Chitin
    4. Polysaccharide
    5. Protein

 

  1. What is the reaction of β-lactamase enzymes?
    1. Hydrolyze lactose to glucose and galactose
    2. Inactivate the enzyme lysozyme
    3. Inactivate antibiotics like penicillin
    4. Hydrolyze the glycan chain of peptidoglycan
    5. Prevent the transpeptidation reaction during peptidoglycan synthesis

 

  1. Which of these is included in the Gram-positive cell envelope?
    1. Peptidoglycan, LPS, and lipoteichoic acids
    2. Peptidoglycan, LPS, and teichoic acids
    3. Peptidoglycan, LPS, and a periplasmic space
    4. Peptidoglycan, teichoic acids, and lipoteichoic acids
    5. Teichoic acids, lipoteichoic acids, and a periplasmic space

 

  1. Which of these describes the peritrichous arrangement of flagella?
    1. Flagella on a single side of the cell
    2. Flagella in a tuft at one end of the cell
    3. Flagella at both polar ends of the cell
    4. Flagella inside the periplasm wrapping around the cell
    5. Flagella all around the cell

 

  1. Which term describes spherical-shaped bacteria?
    1. Pleiomorphs
    2. Cocci
    3. Vibrios
    4. Bacilli
    5. Spirilla

 

  1. The bacterial chromosome is a highly condensed structure that is tightly wound up around itself to fit into the bacterial cell. What is the main enzyme responsible for condensing the DNA?
    1. DNA endonuclease
    2. DNA synthease
    3. DNA polymerase
    4. DNA ligase
    5. DNA topoisomerase

 

  1. Which is an example of an “inclusion body” found in a bacterial cell?
    1. Nucleus
    2. Mitochondria
    3. Topoisomerase
    4. Polyhydroxybutyrate
    5. Cell membrane

 

  1. What is the main function of the FtsZ protein in the bacterial cell?
    1. DNA replication
    2. Meiosis
    3. Transcription
    4. Cell division
    5. Translation

 

  1. The MreB protein in bacteria may play an important role in
    1. Energy metabolism
    2. Nuclear division
    3. Motility
    4. Meiosis
    5. Determining cell shape

 

  1. Some bacteria produce sterol-like molecules called        that help to stabilize the plasma membrane
    1. Phycols
    2. Stigmasterols
    3. Hopanoids
    4. Progesterone
    5. Ergosterol

 

  1. If cells are placed into a hypertonic solution, what reaction would you expect?
    1. The cell would pump out ions
    2. The cell would lose water
    3. The cell would gain water
    4. The cell would lyse
    5. The cell would increase in size

 

  1. The glycan portion of peptidoglycan is composed of alternating units of which two compounds?
    1. N-acetylmannose and N-acetylglucose
    2. N-acetylmuramic acid and N-acetylglucosamine
    3. N-acetylfructose and N-acetylglucose
    4. Glucose and fructose
    5. N-acetylmannitol and N-acertlsorbitol

 

  1. Which compound binds the outer membrane of Gram-negative bacteria to the thin peptidoglycan layer?
    1. Bactophrenol
    2. Polysaccharide
    3. Lipoproteins
    4. Lipoteichoic acid
    5. Porin

 

  1. The bacterial flagellum is turned by a motor using energy from
    1. AMP
    2. ATP
    3. A proton motive force
    4. Glucose
    5. Phosphoenolpyruvate

 

  1. What is the typical length of a bacterium?
    1. 0.5 – 5 micrometers
    2. 5 – 10 millimeters
    3. 5 – 10 nanometers
    4. 20 – 40 micrometers
    5. 20 – 40 millimeters

 

  1. Sulfur globules are an example of inclusion bodies that may be found in some bacterial cells. What is their use?
    1. They are used for nucleotide synthesis
    2. They assist in membrane synthesis
    3. They are a carbon source
    4. As an energy source
    5. They provide buoyancy

 

  1. What is the role of the ParM protein in bacteria?
    1. Determination of cell shape
    2. In sugar and protein metabolism
    3. To assign plasmids to each cell during cell division
    4. To assist in carrying out meiosis
    5. In cell movement during chemotaxis

 

  1. Which statement is FALSE in regards to the plasma membrane?
    1. Oxygen can easily diffuse across the plasma membrane
    2. Water can easily diffuse across the plasma membrane
    3. Potassium ions cannot easily diffuse across the plasma membrane
    4. Glucose cannot easily diffuse across the plasma membrane
    5. Protons can easily diffuse across the plasma membrane

 

  1. What conditions must be met in order for an “active transport system” to transport a nutrient into a cell?
    1. Some form of energy is required for proper transport
    2. The nutrient concentration must be lower on the inside of the cell
    3. The nutrient concentration must be higher on the outside of the cell
    4. The nutrient concentration must be equal inside and outside of the cell
    5. Passive diffusion needs to drive this transport

 

  1. What is the main function of peptidoglycan?
    1. Protecting against osmotic stress
    2. Regulating the transport of water into the cell
    3. Protecting the cell from harmful chemicals
    4. Generating energy through electron transport phosphorylation
    5. Controlling movement of nutrients into and out of the cell

 

  1. Which of these is included in the Gram-negative cell envelope?
    1. Peptidoglycan, LPS, and teichoic acids
    2. Peptidoglycan, teichoic acids, and lipoteichoic acids
    3. Peptidoglycan, LPS, and lipoteichoic acids
    4. Teichoic acids, lipoteichoic acids, and a periplasmic space
    5. Peptidoglycan, LPS, and periplasmic space

 

  1. What are short fiber-like structures that protrude from the bacterial surface and are primarily used for attachment called?
    1. Pili
    2. Lipopolysaccharides
    3. Bactophrenol
    4. Flagellin
    5. Porins

 

 

 

 

 

 

 

 

 

 

 

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