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orchidtortoise613Lv1

28 Sep 2019

In this lab exercise you will watch animations about viruses and answer questions about them.

ANIMATION #1

Click on the links below to watch YouTube animations about the lysogenic and lytic cycles of viruses:

excellent animation of the lytic cycle :

http://www.youtube.com/watch?v=wVkCyU5aeeU&NR=1

excellent animation of the lysogenic cycle:

http://www.youtube.com/watch?v=_J9-xKitsd0

Answer the following questions about the animations:

1. Name the parts of a virus:

2. How do viruses reproduce?

3. What happens in the first stage of viral replication?

4. What happens in the second stage of viral replication?

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Bunny GreenfelderLv2

28 Sep 2019

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Related questions

In this lab exercise you will watch animations about viruses and answer questions about them.

ANIMATION #2

Click on the link below to watch an animation by McGraw-Hill about the entry of a virus into an animal host cell:

http://highered.mcgraw-hill.com/sites/0072556781/student_view0/chapter18/animation_quiz_1.html

Answer the following questions about the animation:

1. Name the green molecules embedded in the envelope of the virus, or virion:

2. What do these molecules attach to on the host cell membrane?

3. What does the envelope of the virus fuse with in order to release the viral capsid into the host cell?

4. What is the innermost part of the virus that is released by the protein capsid into the cytoplasm of the host cell?

peachcicada762

QUESTION 1: The rabies virus primarily affects the nervous system. The specificity that the rabies virus has for neuronal host cells is primarily dictated by __________________________.

A. the helical shape of its viral capsid

B. the type of nucleic acid used for its viral genome (single-stranded, antisense RNA)

C. the spikes that protrude from its viral envelope

D. the segmented nature of its viral genome

QUESTION 2: Which of the following genome types has been observed in viruses? To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

A. Single-stranded RNA

B. Single-stranded DNA

C. Double-stranded RNA

D. Protein-based

QUESTION 3: Choose the correct statement about viral evolution.

A. RNA and DNA viral genomes evolve at equal rates.

B. Cellular genomes mutate at a faster rate than viral genomes due to their large size and increased chance of replicative mistakes.

C. DNA viruses mutate faster than RNA viruses because thymine is more susceptible to mutation than uracil.

D. RNA viruses mutate faster than DNA viruses due to a lack of proofreading replicative enzymes.

QUESTION 4: Your elderly patient is affected by shingles. After careful observation, you note that the virus responsible for the infection has an icosahedral capsid, is enveloped, and has double-stranded linear DNA as its genetic material. Based on this information, in which of the following viral families would you group this viral pathogen?

QUESTION 5: Which of the following is a key difference between lytic and lysogenic bacteriophage replication cycles?

A. Lysogenic bacteriophages release via host cell lysis, whereas lytic bacteriophages bud off from the host cell membrane.

B. The lytic replication cycle ends with host cell lysis and release of newly formed bacteriophage particles, whereas lysogenic replication leads to prophage formation.

C. Lytic replication requires an uncoating step, whereas in lysogenic replication, the bacteriophage's nucleic acid is directly injected into the host cell.

D. Whereas lytic replication enables the infection of several hosts, lysogenic replication only allows for infection of a single host cell.

QUESTION 6: Which of the following is an unsuitable culture method for an animal virus?

A. Direct inoculation of virus onto blood agar

B. Live animal inoculation