CHAPTER 16: VIRUSES

Which of the following is NOT a feature associated with viruses?

Cytoplasm

An organism that carries a virus without having symptoms is called

a reservoir

Why are viruses not considered to be alive?

Because they depend on host cells to reproduce

At which stage in viral replication does the genetic information enter the host cell?

Penetration

A virus can jump from one host species to a different host species because

mutations in the virus let it recognize a new host surface molecule

Which step in viral replication would be the best target to prevent the spread of a virus?

Attachment

What occurs during a lysogenic infection?

Viral genetic material inserts into the host DNA

The severity of the symptoms associated with a viral infection is related to

the response of the immune system and the number and types of cells that become infected

What is a prion?

A protein that can alter the shape of a second protein

What property of a virus makes it useful for making transgenic organisms?

The insertion of viral genes into the host's DNA

Viruses have which of the following?

DNA or RNA

In Figure 17-4(3), where in the host cell are these viral proteins synthesized?

ribosomes

Which of the following is NOT characteristic of a lytic infection?

The virus "hides" within the host & a prophage is formed

Which of the following would be an example of reverse transcription?

Chronic wasting disease (CWD) is a disease that affects hoofed ruminant mammals found in North America (e.g., mule deer, white-tailed deer, elk, and moose). The disease is a progressive neurodegenerative disorder that is fatal, and was recognized as a type of spongiform encephalopathy in 1978. This disease is caused by ___________.

prions

The Epstein-Barr viruses enter the host's white blood cells via what process(es)?

active transport

The gH and gL molecules are likely composed of what type(s) of biological molecule(s)?

proteins

Viral proteins are produced at the _____________ during the process known as _________.

ribosomes; translation

The Epstein-Barr virus is a

lysogenic infection

From "Investigating Life: Scientific Detectives Follow HIV's Trail": Which of the following is true about HIV-1?

It probably originated from a virus found in chimpanzees in central Africa.