New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Chapter 11: Viruses- part 1

by: Siân L'Roy

Chapter 11: Viruses- part 1 2420

Marketplace > Tarrant County College District > Biology > 2420 > Chapter 11 Viruses part 1
Siân L'Roy


Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

This chapter covers the basics about common viruses. It also covers the components of viruses and how they effect a host cell
Mark Pulse
Class Notes
25 ?




Popular in Microbiology

Popular in Biology

This 2 page Class Notes was uploaded by Siân L'Roy on Monday August 22, 2016. The Class Notes belongs to 2420 at Tarrant County College District taught by Mark Pulse in Summer 2016. Since its upload, it has received 5 views. For similar materials see Microbiology in Biology at Tarrant County College District.


Reviews for Chapter 11: Viruses- part 1


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 08/22/16
Viruses­ Part I  Each virus is identified as a virus particle or virion (single virus)  Virus particles consists of DNA surrounded by a protein coat known as a capsid o A capsid is made up of identical proteins known as capsomers o If there is only a capsid, then it is identified as a ‘naked’ virus particle o Some particles have an outer lipid covering, identified as enveloped viruses  (mostly animal viruses) o Capsid associated projections are identified as attachment spikes; envelope  associated projections are matrix proteins  Three different particle (capsid) shapes exist: 1. Isometric­capsid: are made of flat, equilateral triangles 2. Helical­capsid: are rod­shaped  3. Complex­isometric: head is attached to a long tail projection and only occurs  in bacterial population  The viral(phage) infection type depends on the replication mechanism of the virus after  infection; two general types of infections occur: o Productive infection: multiple in host cell and escape by lysing(lytic) or  leaking(extrude) mechanisms; they are usually quick and rapid o Temperate infection: phage DNA replicates as the host DNA replicates; infection  may not be evident(latent), but can change to lytic stage(phage induction); they  are usually slow, provirus and release by budding  Phage that reproduce through a productive lytic infection of the host cell is identified as a virulent phage  T4 cell are a double­stranded DNA phage that infects E. coli and reproduces through a  productive lytic infection  T4 replication in E. coli occurs in six outlined steps: o Attachment (Adsorption): Protein fibers on the tail attach to specific cell wall  receptors on host cell o Penetration: Lysozyme degrades a portion of the cell wall and dsDNA is injected  into the host cell (phage; DNA(viral) inside; capsid outside) o Transcription: Transcription of host DNA stops, phage DNA is transcribed  producing phage­encoded proteins; early proteins include a nuclease that degrades Viruses­ Part I the host DNA and capsid­associated proteins (removing the competition; breaking up the host DNA) o Replication: phage DNA is replicated and more proteins are synthesized using the host’s machinery o Assembly(maturation): 1. Phage head formed 2. dsDNA is incorporated  3. Assembled tail is attached to head 4. Tail spikes and fibers are added to the end of the tail o Release: phage­encoded lysozyme is produced internally, which digests the cell wall  and results in cellular lysis  Phage lambda reproduces through a temperate/productive infection in E. coli o Phage DNA integrates into the host (chromosomal) DNA through site­specific  recombination o Integrated DNA is vertically passed onto progeny; a phage­encoded repressor  protein helps maintain integrated DNA  o Phage DNA is excised and the phage enters into the productive  lytic stage o Phage capsid structures are produces, excised DNA is packaged, and particles are  assembled o Particles are released by cellular lysis  Filamentous phage reproduce through a temperate infection of F+ E. coli o Filamentous phage attach(adsorb) to the host cell at the F+ pilus and the phage  DNA is injected o Phage DNA replicated in the carrier (host) cell o As DNA is extruded (leaked) from the carrier cell, cytoplasmic­ associated  capsomer proteins assemble to form protein coat  o Phage particles are released without lysing the carrier cell


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Anthony Lee UC Santa Barbara

"I bought an awesome study guide, which helped me get an A in my Math 34B class this quarter!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.