Viruses and Bacteria
Cards (13)
- Virus
- acellular entities that can usually only be seen with an electron microscope
- Their genomes contain either DNA or RNA, and they replicate using the replication proteins of a host cell
- are diverse, infecting archaea, bacteria, fungi, plants, and animals
- consist of a nucleic-acid core surrounded by a protein capsid with or without an outer lipid envelope
- Bacteria - are small single-celled organisms. They are found almost everywhere on Earth and are vital to the planet's ecosystems. Some species can live under extreme conditions of temperature and pressure. Uses transverse fission to reproduce
- Classification of Bacteria
- bacilli: rod-shaped
- cocci: spherical
- sprilla: curved walls
- Virus is not a living organism because they:
- don't grow
- obtain or use energy
- respond to environment
- Types of Viruses
- Helical viruses - consist of nucleic acid surrounded by a hollow protein cylinder or capsid and possessing a ---- structure
- Polyhedral viruses - consist of nucleic acid surrounded by a ---- (many-sided) shell or capsid, usually in the form of an icosahedron
- Enveloped viruses - consist of nucleic acid surrounded by either a helical or polyhedral core and covered by an envelope
- Binal (complex) viruses - have neither helical nor polyhedral forms, are pleomorphic or irregular shaped or have complex structures
- Classification of Viruses
- Virulent - when a virus causes a disease
- Temperate - when a virus does not cause disease immediately
- Bacteriophage - special type of virus that attacks bacteria
- Capsule - protective covering which enables the bacteria to resist any chemical action by drug.
- Venereal Diseases - diseases that are transmitted by sexual contact
- Blue Green Bacteria - members of the Phylum Cyanophyta
- Escherichia Coli - a bacteria that is abundant in human digestive tract
- Microbiology - is a study of microorganisms
- Pathogens - microorganism that cause disease
- Non-Pathogen - microorganisms that don't cause disease