3 Bacteria and Virus Structure 0.0 / 5 ? BiologyCellsA2/A-levelAQA Created by: lee8444Created on: 31-01-20 12:57 Bacteria Structure Cell Wall Physical barrier that excludes certain substances Protects against mechanical damage and osmotic lysis Made from murein, made from polysaccharides and peptides Capsule Protects bacteria from other cells Helps bacteria stick together Slimy CSM Controls entry and exit of chemicals Has 70S ribosomes attached Circular DNA Has the genetic information for binary fission Plasmid Has genes that aid survival such as enzymes that break down antibiotics 1 of 2 Virus Structure Acellular Non-living 20-300nm has nucleic acids in the form of DNA or RNA Requires a host cell to multiply Contained within a capsid Some viruses such as HIV have a lipid envelope Attachment proteins on the surface to invade cells 2 of 2
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