Podcast
Questions and Answers
What percentage of cell dry weight is composed of a few major elements?
What percentage of cell dry weight is composed of a few major elements?
- 50%
- 95% (correct)
- 75%
- 99%
Which of the following macroelements is required for the activity of enzymes involved in protein synthesis?
Which of the following macroelements is required for the activity of enzymes involved in protein synthesis?
- Calcium (Ca2)
- Potassium (K) (correct)
- Iron (Fe2 and Fe3)
- Magnesium (Mg2)
What is the primary function of magnesium in the cell?
What is the primary function of magnesium in the cell?
- Stabilizes ribosomes and cell membranes
- Participates in electron transport chains
- Serves as a cofactor for many enzymes (correct)
- Contributes to heat resistance of bacterial endospores
What is the role of iron in the cell?
What is the role of iron in the cell?
What are the four macroelements that exist in the cell as cations?
What are the four macroelements that exist in the cell as cations?
What is the primary function of carbon in the cell?
What is the primary function of carbon in the cell?
What is the primary mechanism of extinguishing a candle's flame in a candle jar?
What is the primary mechanism of extinguishing a candle's flame in a candle jar?
What type of microorganisms are typically grown in candle jars?
What type of microorganisms are typically grown in candle jars?
What is the purpose of inoculating the second half of the Petri dish with Serratia marcescens?
What is the purpose of inoculating the second half of the Petri dish with Serratia marcescens?
What is the main purpose of maintaining quality control (QC) stocks in a microbiology laboratory?
What is the main purpose of maintaining quality control (QC) stocks in a microbiology laboratory?
What is the primary reason for maintaining the purity of a microorganism in a pure culture?
What is the primary reason for maintaining the purity of a microorganism in a pure culture?
What is the purpose of sealing the Petri dish with wax or paraffin?
What is the purpose of sealing the Petri dish with wax or paraffin?
What is a characteristic of obligate anaerobes?
What is a characteristic of obligate anaerobes?
What is the primary function of extracellular electron transfer in microorganisms?
What is the primary function of extracellular electron transfer in microorganisms?
Why are anaerobes killed by oxygen?
Why are anaerobes killed by oxygen?
What is the primary reason why Fe(II) is more available to microorganisms than Fe(III)?
What is the primary reason why Fe(II) is more available to microorganisms than Fe(III)?
What is the purpose of Fe(II) oxidizing microorganisms coupling the oxidation of iron to intracellular reduction of oxygen, carbon dioxide, and nitrate?
What is the purpose of Fe(II) oxidizing microorganisms coupling the oxidation of iron to intracellular reduction of oxygen, carbon dioxide, and nitrate?
What is the purpose of boiling the culture medium during the preparation of Prereduced media?
What is the purpose of boiling the culture medium during the preparation of Prereduced media?
What is the function of superoxide dismutase in anaerobic bacteria?
What is the function of superoxide dismutase in anaerobic bacteria?
What is the essential requirement for microorganisms to grow?
What is the essential requirement for microorganisms to grow?
Why are specimens from the throat or vaginal swab not submitted for anaerobic culture?
Why are specimens from the throat or vaginal swab not submitted for anaerobic culture?
What is the result of microorganisms changing the redox state of metals?
What is the result of microorganisms changing the redox state of metals?
What is the purpose of adding a reducing agent, such as cysteine, to the culture medium during the preparation of Prereduced media?
What is the purpose of adding a reducing agent, such as cysteine, to the culture medium during the preparation of Prereduced media?
Where do microorganisms carry out the process of extracellular electron transfer?
Where do microorganisms carry out the process of extracellular electron transfer?
At what temperature should isolates be stored for long-term preservation?
At what temperature should isolates be stored for long-term preservation?
What is the recommended method for long-term preservation of bacterial culture?
What is the recommended method for long-term preservation of bacterial culture?
How often should non-fastidious organisms be thawed, reisolated, and refrozen when frozen at -70°C?
How often should non-fastidious organisms be thawed, reisolated, and refrozen when frozen at -70°C?
What is the purpose of adding a cryoprotectant to a solution when storing viruses at -70°C?
What is the purpose of adding a cryoprotectant to a solution when storing viruses at -70°C?
What is the temperature of an ultralow freezer?
What is the temperature of an ultralow freezer?
What is the term for freezing in liquid nitrogen at -196°C or in the gas phase above the liquid nitrogen at -150°C?
What is the term for freezing in liquid nitrogen at -196°C or in the gas phase above the liquid nitrogen at -150°C?
