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Bacterial Cell Structure

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Questions and Answers

Which of the following is NOT a characteristic of bacteria?

They are microscopic single-celled organisms.

They possess a cell wall made of cellulose. (correct)

They lack mitochondria, chloroplasts, and other membrane-bound organelles.

They lack a nucleus but contain a circular chromosome of DNA.

What is the function of a flagellum in bacteria?

To synthesize proteins

To allow movement (correct)

To store genetic information

To provide structural support

What is a plasmid in a bacteria?

A small ring of DNA that contains extra genes. (correct)

A protein that helps in cell division.

A long, thin, whip-like tail that allows movement.

A type of membrane-bound organelle.

Which of the following is an example of a spherical bacterium?

<p>Pneumococcus (C)</p> Signup and view all the answers

What is the main difference between bacteria and animal cells?

<p>Bacteria cells are prokaryotic, animal cells are eukaryotic. (B)</p> Signup and view all the answers

Flashcards

Bacteria

Microscopic single-celled organisms with varied shapes.

Cell Wall

Rigid layer made of peptidoglycan surrounding bacteria cells.

Circular Chromosome

DNA structure that floats in the cytoplasm of bacteria.

Plasmids

Small rings of DNA providing extra genetic information, found in some bacteria.

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Flagella

Whip-like tails that assist in bacterial movement.

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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.
Bacteria lack a nucleus.
They contain a circular chromosome of DNA within the cytoplasm.
Plasmids (small rings of DNA) may be present, carrying additional genes.
Bacteria lack mitochondria, chloroplasts, and other membrane-bound organelles.
Some bacteria have flagella (whip-like tails) for movement.

Examples of Bacteria

Lactobacillus: Rod-shaped bacterium used in yogurt production.
Pneumococcus: Spherical bacterium causing pneumonia.

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Description

Explore the fascinating world of bacterial cell structure and characteristics. This quiz covers essential features of bacteria including cell walls, DNA organization, and movement. Test your knowledge on specific examples and the functions of these microscopic organisms.