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Questions and Answers
Which of the following is a characteristic shared by all bacteria?
Which of the following is a characteristic shared by all bacteria?
- They are microscopic, single-celled organisms. (correct)
- They have a rigid cell wall made of chitin.
- They are capable of photosynthesis.
- They possess a nucleus containing their genetic material.
What is the function of plasmids in bacteria?
What is the function of plasmids in bacteria?
- To assist in the production of energy through respiration.
- To store genetic material in a nucleus.
- To provide structural support for the cell wall.
- To carry extra genes for specific traits. (correct)
Which of the following is NOT a characteristic of bacteria?
Which of the following is NOT a characteristic of bacteria?
- They have a circular chromosome of DNA.
- They have a cell membrane.
- They contain membrane-bound organelles like mitochondria. (correct)
- They can be rod-shaped, spherical, or spiral.
What is the primary role of flagella in bacteria?
What is the primary role of flagella in bacteria?
Which of the following is an example of a spherical bacterium?
Which of the following is an example of a spherical bacterium?
Flashcards
Bacteria
Bacteria
Microscopic single-celled organisms with diverse shapes and sizes.
Cell Wall
Cell Wall
A rigid outer layer made of peptidoglycan that protects bacteria.
Circular DNA
Circular DNA
DNA that floats in the cytoplasm, lacking a nucleus.
Flagella
Flagella
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Plasmids
Plasmids
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Study Notes
Bacterial Cell Structure
- Bacteria are microscopic single-celled organisms.
- They possess a cell wall (peptidoglycan), cell membrane, cytoplasm, and ribosomes.
- They lack a nucleus and have a circular chromosome of DNA in their cytoplasm.
- Plasmids, small rings of DNA containing extra genes, might be present, also floating in the cytoplasm.
- Bacteria lack mitochondria, chloroplasts, and other membrane-bound organelles.
- Some bacteria have flagella (whip-like tails) enabling movement.
- Bacteria exhibit diverse shapes (e.g., rod-shaped, spherical).
- Examples include Lactobacillus (yogurt production) and Pneumococcus (pneumonia).
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