Structure of bacteria and virus

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Topic 6

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10 Terms

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Bacteria

Small, single-celled prokaryotes with a cytoplasm lacking membrane-bound organelles and a single circular chromosome.

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Prokaryotic Cells

Cells smaller than eukaryotic cells, with 70 S ribosomes, no nucleus, murein-containing cell wall, and mesosomes in the cell membrane.

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Plasmids

Loops of DNA in prokaryotic cells, separate from the main chromosome, aiding in gene transfer.

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Capsules

Structures like slime capsules in bacteria, protecting them from drying out and immune system attacks.

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Flagella

Tail-like structures in prokaryotes enabling movement, with some having more than one.

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Pili

Thread-like structures on bacteria surfaces for attachment to other cells or surfaces, involved in gene transfer.

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Viruses

Non-cellular infectious particles with nucleic acid core, protein coat (capsid), and attachment proteins for host cell attachment.

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Mycobacterium tuberculosis

Bacteria causing tuberculosis, transmitted through air droplets, affecting lungs and potentially other organs.

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HIV

Human immunodeficiency virus containing RNA, infecting helper T cells, leading to decreased lymphocyte numbers and AIDS progression.

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AIDS

Acquired immune deficiency syndrome resulting from HIV, leading to immunocompromise, opportunistic infections, and potentially death.