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Questions and Answers
What is the basic unit of a living organism?
What is the basic unit of a living organism?
- Nucleus
- Cell (correct)
- Cytoplasm
- Cell wall
Which category of cells do not contain membrane-bound organelles?
Which category of cells do not contain membrane-bound organelles?
- Archaea
- Bacterial
- Prokaryotic (correct)
- Eukaryotic
What is the typical range of bacterial cell size in terms of diameter?
What is the typical range of bacterial cell size in terms of diameter?
- 5.5 to 7.0 μm
- 1.5 to 3.0 μm
- 0.1 to 1.0 μm (correct)
- 3.5 to 5.0 μm
What is the shape of Cocci bacteria?
What is the shape of Cocci bacteria?
What is the arrangement resulting in bacterial cells remaining in pairs after dividing?
What is the arrangement resulting in bacterial cells remaining in pairs after dividing?
Which type of cell has the genetic material contained within membrane-bound nuclei?
Which type of cell has the genetic material contained within membrane-bound nuclei?
Which type of bacteria is arranged in grape-like clusters?
Which type of bacteria is arranged in grape-like clusters?
What is the shape of Vibrio bacteria?
What is the shape of Vibrio bacteria?
Which bacteria are arranged in long chains?
Which bacteria are arranged in long chains?
What is the characteristic shape of Spirochetes?
What is the characteristic shape of Spirochetes?
Which bacteria resemble both cocci as well as bacilli?
Which bacteria resemble both cocci as well as bacilli?
Which type of bacteria form a group of eight cells?
Which type of bacteria form a group of eight cells?
What is the shape of Bacillus bacteria?
What is the shape of Bacillus bacteria?
Which bacteria are flexible and have an axial filament for motility?
Which bacteria are flexible and have an axial filament for motility?
What is the function of the bacterial cell wall?
What is the function of the bacterial cell wall?
What type of bacteria lack endoflagella and are more rigid than spirochetes?
What type of bacteria lack endoflagella and are more rigid than spirochetes?
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Study Notes
Basic Units and Cell Types
- The basic unit of a living organism is a cell.
- Prokaryotic cells do not contain membrane-bound organelles.
Bacterial Characteristics
- Bacterial cell size typically ranges from 0.5 to 5 micrometers in diameter.
- Cocci bacteria have a spherical shape.
- Bacterial cells can remain in pairs (diplococci) after division.
- Staphylococci are arranged in grape-like clusters.
- Vibrio bacteria are shaped like a comma.
- Streptococci are arranged in long chains.
- Spirochetes have a characteristic spiral shape.
- Coccobacilli resemble both cocci (spherical) and bacilli (rod-shaped).
- Sarcina forms a group of eight cells.
- Bacillus bacteria are rod-shaped.
Motility and Structure
- Some bacteria are flexible and possess an axial filament for motility, typically associated with spirochetes.
- The cell wall of bacteria functions to maintain shape, protect against osmotic pressure, and provide structural support.
- Gram-positive bacteria lack endoflagella and are generally more rigid than spirochetes.
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