Viruses

Viruses:

• infectious particle

• Made of:

  • protein shel/capside

  • Nucleis acid (DNA/RNA)

RNA viruses:

• poliovirus

• cornovirus

• influenza

• aid

• measles

DNA viruses:

• herpesviris

• hepaitius B

• chicken pox

genomes can be single stranded

genomes can also be double stranded

some viruses had a lkpid membrane called an envelope

coronvirus

infeuza

Common features
small
only reporuce in host

dont have a ribosome

not alive because they cnat reproduce

Virus cyle:

attahces o a hst by binding to receptor molecules on cell srface

Enters its dna inside of host cell

will interfer with host cell geneitc material and function to mass pridce its own genetic info

new virus particle are produced and levae cell

immune system: cell and tissues

act to defend th ebody against pathogens

immnuity: protetcion from threats

innate immunity: defenses in the body that are presnet since borth

always active and teh first reposnders

Types of innate iimunity: physcial barriers, chemical defences, phagocytes, inflamamtion

physcial barriers:

• skin proettcs inner body from stuff

Chemical defneses:

• enzymes destroy micro orgnamsis from growing

• fevers prevent bacterial growth

Phagocytes:

• macrophage surround and swallow bacteria

Inflammation:

• reactions generate: pain, swelling, heat, redness

Adaptive immnuity:

• long lasting immunity to viruses by seciflaly targetting them

• mediated by specialized white blood cells lymphcytes