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Topic 2 Biology > Viruses 2.0 > Flashcards

Viruses 2.0 Flashcards

1
Q

how can viruses be classifyed

A

genome and by their mode of replication

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2
Q

Gentic material in DNA VIRUS?

A

DNA

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3
Q

What is a DNA virus

A

the viral DNA directs acts as a template for new virla DNA and for the mRNAs needed to create viral proteins

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4
Q

Gentic Material in RNA

A

RNA as the gentic material

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5
Q

What are the 2 types of RNA viruses that make the RNA virus

A

+ssRNA

-ssRNA

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6
Q

What is a -ssRNA virus

A

CANNOT BE DIRECTLY TRANSLATED

RNA strand must be transcribed before translated at the ribsomes

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7
Q

diseases that are caused by –ssRNA virus

A

Ebola

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8
Q

What is a +ssRNA virus

A

have RNA that can directly act as mRNA and be translated at the ribsomes

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9
Q

Diseas caused by +ssRNA virus

A

tobacco mosaic virus

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10
Q

What disease does DNA virus cause

A

lambda phage

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11
Q

Features of the retrovirus

A

Single strand of RNA
Reverse transcripatse enzyme produces cDNA from RNA template
Double stranded viral DNA intergrates into the host cells genome

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12
Q

Strucutre of a DNA virus?

A

Nucleic acid DNA which acts directly as a template for mRNA transcription/ DNA replication

Geometrical Shape

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13
Q

Compare and contrast the tobacco MV and ebola

A

Both are RNA viruses

TMV contains ssRNA virus which can be directly transated into proteins by ribosomes

Ebola contains -ssRNA which needs to be transcribed to produce mRNA before translation

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14
Q

Why are viruses classifed as non living

A

a celluar
No cytoplasm
cannot self replicated

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15
Q

Whats the role of glycoproteins

A

Used for attachemnt to CD4 receptors on t helper cell

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16
Q

Why does HIV have to invade cells to replciate

A

HIV not have ribosomes, enzymes to replicate alone

17
Q

What does HIV affect

A

T helper cells which are involved with activitaing

B cells- which secrete antibodies

Activate macrophages
- this helps to ingest pathogens

18
Q

How do antivirals work

A

Targeting viral antigens to prevent entry into host cell

Targeting viral enzymes to prevent DNA replication and viron assemely

Topic 2 Biology (32 decks)

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