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MIC 319 Exam 2 2025 Questions and Answers

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MIC 319 Exam 2 2025 Questions and Answers Class 1 - ANS Knowing the enemy: Virology What makes a virus unique? - ANS they are infectious, obligate intracellular parasites (cannot replicate on their own, they need a host) - the way it infects (receptor to infect) - it needs conducive environment (to replicate) - its genetic makeup What percentage of human DNA comes from viruses? - ANS 8% of human DNA comes from viruses Why don't viruses we eat infect us? - ANS - they are dead (usually get cooked and die) - we do not have a receptor for them (Tropism = every virus has a special molecule on their surface for infection) plant viruses cannot infect animals and vice versa - we have no survival habitat What information do we get from physical measurement of virus particles? - ANS - the number of virus particles - the shape of the virus - the size of the virus Pg. 2 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED. - hemagglutination - viral enzymes - electron microscopy - nucleic acids - serology does *NOT* give infectivity (alive or dead) of virus What happens when we eat plant viruses? - ANS Nothing How many classes of viruses are there? - ANS there are 7 classes of viruses based on their nucleic acid and strandedness - dsDNA - gapped dsDNA - SSDNA - dsRNA - SS (+) RNA - SS (-) RNA - SS (+) RNA with DNA intermediate What are the biggest and smallest viruses? - ANS Smaller viruses can be around 20 micrometers - example: poliovirus (30 nm) Larger viruses can be around 1 um - example: mimivirus and pan

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MIC 319 Exam 2 2025 Questions and
Answers




Class 1 - ANS Knowing the enemy: Virology



What makes a virus unique? - ANS they are infectious, obligate intracellular parasites (cannot
replicate on their own, they need a host)


- the way it infects (receptor to infect)
- it needs conducive environment (to replicate)
- its genetic makeup



What percentage of human DNA comes from viruses? - ANS 8% of human DNA comes from
viruses



Why don't viruses we eat infect us? - ANS - they are dead (usually get cooked and die)
- we do not have a receptor for them (Tropism = every virus has a special molecule on their
surface for infection) plant viruses cannot infect animals and vice versa
- we have no survival habitat



What information do we get from physical measurement of virus particles? - ANS - the
number of virus particles
- the shape of the virus
- the size of the virus


Pg. 1 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.

, - hemagglutination
- viral enzymes
- electron microscopy
- nucleic acids
- serology


does *NOT* give infectivity (alive or dead) of virus



What happens when we eat plant viruses? - ANS Nothing



How many classes of viruses are there? - ANS there are 7 classes of viruses based on their
nucleic acid and strandedness


- dsDNA
- gapped dsDNA
- SSDNA
- dsRNA
- SS (+) RNA
- SS (-) RNA
- SS (+) RNA with DNA intermediate



What are the biggest and smallest viruses? - ANS Smaller viruses can be around 20
micrometers
- example: poliovirus (30 nm)


Larger viruses can be around 1 um
- example: mimivirus and pandora virus




Pg. 2 Copyright © 2025 Jasonmcconell. ALL RIGHTS RESERVED.

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