MGY277 UNIT 3 QUERCUS QUIZ

Animal viruses are divided into a number of genera whose names end in:

"-virus"

Most DNA viruses are _________. Their genomes are___________.

Double stranded; circular or linear

Louis Pasteur and colleagues developed a vaccine for rabies using ________ which created an ________ vaccine.

Dried spinal cords of infected rabbits; attenuated

Visible zones of clearing that represent virus-induced cell death in a monolayer of infected cells are known as:

Plaques

A virus is considered to be a retrovirus if it has:

Reverse transcriptase and RNA

Enveloped viruses can obtain their envelope (select all that apply): 1. From host nuclear membrane 2. From a newly synthesized viral membrane 3. From the host plasma membrane 4. As they exit the host

1. From host nuclear membrane 3. From the host plasma membrane 4. As they exit the host

Acute infections (select all that apply): 1. Have symptoms resulting from damage caused by the immune response 2. Can continue for years without symptoms 3. Result from the burst of virions being released form host cells 4. Have symptoms resulting from tissue damage

1. Have symptoms resulting from damage caused by the immune response 3. Result from the burst of virions being released form host cells 4. Have symptoms resulting from tissue damage

Host cells with multiple nuclei is a cytopathic effect resulting from: 1. Multiple host cells fusing due to the ability of some viruses to fuse membranes 2. Some viruses' ability to prevent cytokinesis with mitosis 3. The by-product of host cells lysing (bursting) 4. The ability of the virus to induce tissue damage

1. Multiple host cells fusing due to the ability of some viruses to fuse membranes

Which of the following statement(s) is/are TRUE regarding the 1918 Spanish influenza pandemic (select all that apply)? 1. The worldwide impact of the flu was likely made worse due to the international travel for soldiers for the first world war 2. The onset of symptoms was rapid 3. Those that did not die from the flu often died from secondary yellow fever 4. The incubation period was short

1. The worldwide impact of the flu was likely made worse due to the international travel for soldiers for the first world war 2. The onset of symptoms was rapid 4. The incubation period was short

Which of the following statements about viruses are TRUE (select all that apply)? 1. Their genomes vary greatly in size 2. Some viruses are associated with certain types of cancer 3. Naked viruses generally can enter a cell by membrane fusion 4. SARS, measles, and rabies are all examples of dsRNA viruses 5. The types of cells viruses can infect are limited by having the appropriate receptors

1. Their genomes vary greatly in size 2. Some viruses are associated with certain types of cancer 5. The types of cells viruses can infect are limited by having the appropriate receptors

The 1918 Spanish influenza was highly unusual because: 1. This flu was deadly for people in the middle years of their lives 2. It was caused by a virus 3. It could be effectively treated using opium 4. The symptoms included gastrointestinal issues

1. This flu was deadly for people in the middle years of their lives

Which of the following statements about viruses are TRUE (select all that apply)? 1. Viruses can infect all types of cells 2. Viruses that infect bacteria are known as chloroviruses 3. All viruses are RNA-based 4. Viruses have a role in regulating freshwater and saltwater ecosystems

1. Viruses can infect all types of cells 4. Viruses have a role in regulating freshwater and saltwater ecosystems

Which of the following statements concerning viruses is/are TRUE (select all that apply)? 1. Viruses redirect genetic and metabolic activities once inside their host 2. All viruses have a lipid envelope on their outer surface 3. Some but not all viruses have a protein capsid 4. Viruses are obligate intracellular parasites 5. Viruses are best viewed by bright field microscopy 6. Viruses are metabolically active

1. Viruses redirect genetic and metabolic activities once inside their host 4. Viruses are obligate intracellular parasites

Which TWO of the following primarily determine the unique shape of a virus: 1. Whether the virus is naked or not 2. Capsid symmetry 3. The size of the viral genome 4. Whether the nucleic acid is segmented

1. Whether the virus is naked or not 2. Capsid symmetry

The correct order of stages of animal virus replication is: 1. Attachment, penetration, synthesis of nucleic acid and protein, uncoating, assembly, and release 2. Attachment, penetration, uncoating, synthesis of nucleic acid and protein, assembly, and release 3. Attachment, uncoating, penetration, synthesis of nucleic acid and protein, assembly, and release 4. Attachment, penetration, uncoating, synthesis of nucleic acid and protein, release, and assembly

2. Attachment, penetration, uncoating, synthesis of nucleic acid and protein, assembly, and release

Which statement(s) regarding persistent infection is/are FALSE (select all that apply)? 1. Always characterized by the continuous produce of low levels of virus 2. Occur because the virus is not eliminated from the host following the initial infection 3. Are always characterized by a sudden onset of symptoms 4. Can continue for years with or without symptoms

3. Are always characterized by a sudden onset of symptoms

You are looking under a microscope and see a virus that looks like the tobacco mosaic virus. Which of the following statements about this virus is TRUE? It has an icosahedral nucleocapsid It has a helical nucleocapsid No statements are true, nothing can be said about a virus from an image It has a complex nucleocapsid

It has a helical nucleocapsid

In general, most DNA viruses replicate in the host cell's ________, while most RNA viruses replicate in the host cell's ___________.

Nucleus, cytoplasm

Envelope proteins that may protrude from the surface of a viral envelope are called:

Spikes

An enveloped virus often exits a cell by X, while naked viruses exit the cell by Y.

X = budding, Y = lysis