30 Questions
Where do psychrophiles grow well?
At 0°C
What is a characteristic of psychrotrophs in terms of growth temperature?
Can grow at 0°C
What is a characteristic of mesophiles in terms of growth temperature?
Optimal growth at 15°C
Where would you most likely find thermophiles growing?
Hot springs
What is the pH range for alkalophiles that grow best?
pH 8.5 to 11.5
Why is buffering the culture medium important when dealing with sudden pH changes?
To prevent damage to the plasma membrane
What do autotrophs use as their sole source of carbon?
Carbon dioxide and water
Which type of bacteria derive their energy from the oxidation of inorganic substances?
Chemolithotrophs
What percentage of the dry weight of a bacterial cell is composed of nitrogen?
14%
Which inorganic ion stabilizes ribosomes, cell membranes, nucleic acids, and serves as a co-factor for enzymes?
Magnesium
What do chemoorganotrophs utilize for their carbon source?
Organic substances
Which type of bacteria utilizes light as their source of energy?
Photoorganotrophs
What is the major focus of taxonomy in microbiology?
Organizing and classifying living things based on similarities and differences
What is the main difference between DNA and RNA?
DNA is double-stranded, while RNA is single-stranded
What is the significance of identification in microbiology?
Describing key features of microorganisms
Which process involves the exchange of genetic information among bacteria?
Replication
What is the International Code of Nomenclature of Bacteria primarily concerned with?
Providing guidelines for naming microorganisms
In microbiology, what does the term 'biogenesis' refer to?
Theory that living organisms arise from preexisting life
What is the major difference in the periplasm of Gram-negative and Gram-positive bacteria?
Gram-negative bacteria have periplasm between the cell wall and outer membrane, while Gram-positive bacteria have periplasm between the cytoplasmic membrane and the cell wall.
What role do periplasmic proteins play in bacterial cells?
Transport, degradation, and motility
Which molecule is unique to bacterial cell walls?
Peptidoglycan
How do Mycoplasma bacteria differ from other bacteria in terms of cell wall?
Mycoplasma bacteria have no cell wall and therefore have no definite shape.
What does the rigid structure of peptidoglycan provide for prokaryotic cells?
Shape, protection from the environment
In which compartment can free exchange of molecules occur in bacterial cells?
Cytoplasm
What is the purpose of using chemical agents on living tissue and inanimate objects?
To control the growth of microbes
What is the purpose of using hydrogen peroxide in healthcare and hospitals?
To reduce microbial population to safe levels
Why may a single disinfection not be appropriate for all circumstances?
It may not eliminate all microorganisms
What is a key factor in selecting a disinfectant or antiseptic according to the text?
The nature of the material being disinfected
How do antiseptics differ from disinfectants based on their application?
Antiseptics are applied to kill disease-causing microorganisms on broken skins
Why is it important to read the label on a disinfectant or antiseptic product?
To understand its effectiveness against specific microbes
Learn about the unique characteristics of psychrophiles and psychrotrophs, including their ability to grow at low temperatures, optimal growth conditions, and adaptations in protein synthesis and cell walls. Explore their significance in cold environments and food spoilage.
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