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Viruses (Virus (use (Small Molecules of host cells ((to synthesize progeny…
Viruses
Virus
infectious particle consisting of little more than genes
Latin word "
Poison"
Simplest form of living things
Experimentation
lead to finding evidence that genes are made up of
nucleic acids
Viruses genome
Single-stranded DNA
Double stranded RNA
Double stranded DNA
Single stranded RNA
Smaller than a RIBOSOME
Discovered
late 1800s
studying a plant disease
, tobacco mosaic disease
use
Small Molecules of host cells
(to synthesize progeny viruses during replication)
some viruses can replicate only within cells
Ribosomes
Enzymes
Capsid
Protein that encloses viruses
Shapes
Polyhedral
more complex in shape
Rod-Shaped
Built from a large number of protein subunits called
Capsomeres
Number of proteins is usually small
Viral envelope
membranous envelope (surround capsids)
Contain
Phosphoplipids
Glycoproteins
(proteins with carbonhydrates )
Viruses that infect bacteria or simply
phages
(viruses that infect bacteria )
Can replicate bt two alternative mechanisms
Lytic Cycle
Virulent or temperature phage
Destruction of host DNA
Production of new phages
Lysis of host cell causes release of progeny phages
Lysogenic Cycle
Temperature phage only
Genome integrates into bacterial chromosome as
prophage
CRISPR-Cas System
way of defending bacteria against phage infections