virsuses Flashcards

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1
Q

lambda phage virus

A

capsid with head and tail
double stranded DNA
transcribed into host cell by mRNA
infects bacterium

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2
Q

Tobacco Mosaic Virus (TMV)

A

capsid with spiral of polypeptides
single stranded RNA
transcribed into host cell from mRNA
infects plants

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3
Q

Ebola

A

protein capsid
single stranded RNA
transcribed into host cell from mRNA
infects several types of human cell

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4
Q

HIV

A

capsid surrounded by phospholipid and glycoprotein envelope
single stranded RNA transcribed into single stranded DNA
infects macrophage and T helper cells of humans

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5
Q

action of antivirals

A

prevent viral replication
by preventing viral RNA being incorporated to host DNA
by reverse transcriptase
and integrase
so viral DNA is not made from viral RNA

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6
Q

how skin prevents viruses entering

A

keratin
skin acts as a physical barrier
does not have complementary receptors

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7
Q

why viruses are not affected by antibiotics

A

not living cells
don’t have cell walls

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8
Q

why there is a delay in cell lysis from initial infection of a cell by lambda phage virus

A

viral DNA enters host
new DNA synthesised
protein synthesises must occur
to form more viruses

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9
Q

only virus to contain DNA

A

lambda phage

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10
Q

why an electron microscope, rather than a light microscope is used to take images of viruses

A

resolution is higher
due to shorter wavelength of electrons

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11
Q

Describe the lytic cycle of a virus

A

viral proteins made
virus multiplies until cell lysis

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12
Q

State what is meant by the term latency

A
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13
Q
A
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