The reticuloendothelial system

The reticuloendothelial system

A. is a support network of connective tissue fibers.
B. originates in the cellular basal lamina.
C. provides a passageway within and between tissues and organs.
D. is heavily populated with macrophages.
E. All of the choices are correct.

Answer: E

_____ is a mechanism of release for enveloped viruses.

_____ is a mechanism of release for enveloped viruses.

A) Lytic replication
B) Persistent infection
C) Oncogenesis
D) Latency
E) Budding




Answer: E

Virus infection results in cancer in the process of

Virus infection results in cancer in the process of

A) lytic replication.
B) budding.
C) oncogenesis.
D) persistent infection.
E) latency.

Answer: C

Virus replication results in the death of the cell in a(n) __________ infection.

Virus replication results in the death of the cell in a(n) __________ infection.

A) lytic
B) latent
C) persistent
D) oncogenic
E) both latent and persistent

Answer: A

During __________, viruses remain dormant in a cell.

During __________, viruses remain dormant in a cell.

A) budding
B) latency
C) lytic replication
D) persistent infection
E) oncogenesis

Answer: B

Viruses are shed slowly and steadily during

Viruses are shed slowly and steadily during

A) lytic replication.
B) budding.
C) oncogenesis.
D) persistent infection.
E) latency.

Answer: D

Proteins are present in

Proteins are present in

A) cells only.
B) viruses only.
C) viroids only.
D) both cells and viruses.
E) cells, viruses, and viroids.

Answer: D

Cytoplasm is a characteristic of

Cytoplasm is a characteristic of

A) cells only.
B) viruses only.
C) both cells and viruses.
D) viroids only.
E) both viroids and viruses.

Answer: A

Double-stranded RNA genomes can be found

Double-stranded RNA genomes can be found

A) only in cells.
B) in both cells and viruses.
C) only in viruses.
D) in prions.
E) in both prions and viruses.

Answer: C

Double-stranded DNA genomes are found

Double-stranded DNA genomes are found

A) only in viroids.
B) only in cells.
C) only in viruses.
D) in both cells and viruses.
E) in both viruses and viroids.

Answer: D

The infectious particles of fungi have RNA genomes and lack a capsid. They are therefore similar to

The infectious particles of fungi have RNA genomes and lack a capsid. They are therefore similar to

A) bacteriophages.
B) enveloped viruses.
C) prions.
D) viroids.
E) lysogens.




Answer: D

How are prions different from all other known infectious agents?

How are prions different from all other known infectious agents?

A) They cannot reproduce outside a cell.
B) They act as slow viruses.
C) They cause neurological problems.
D) They can be destroyed by incineration.
E) They lack nucleic acid.

Answer: E

Viroids infect

Viroids infect

A) bacteria.
B) plants.
C) fungi.
D) plants and animals.
E) all organisms.





Answer: B

Diploid cell cultures and continuous cell cultures differ in which of the following ways?

Diploid cell cultures and continuous cell cultures differ in which of the following ways?

A) longevity
B) source of cells
C) convenience of use
D) longevity and convenience of use
E) longevity and source of cells

Answer: E

Plaque assays are used for

Plaque assays are used for

A) evaluating the cancer-causing ability of a virus.
B) estimating the number of phages in a culture.
C) the study of prions.
D) cultivating viruses that cannot be grown any other way.
E) counting the number of latent phages in a cell.

Answer: B

Tumors invade other organs and tissues in a process called

Tumors invade other organs and tissues in a process called

A) neoplasia.
B) a plaque assay.
C) latency.
D) budding.
E) metastasis.




Answer: E

One mechanism by which viruses may cause cancer is to interrupt the genetic regulatory sequences of repressor proteins. Which of the following types of viruses is most likely to be involved in causing cancer by this mechanism?

One mechanism by which viruses may cause cancer is to interrupt the genetic regulatory sequences of repressor proteins. Which of the following types of viruses is most likely to be involved in causing cancer by this mechanism?

A) +ssRNA viruses
B) dsRNA viruses
C) -ssRNA viruses
D) retroviruses
E) +ssRNA and -ssRNA viruses

Answer: D

Which of the following individuals discovered prions?

Which of the following individuals discovered prions?

A) Lacks
B) Iwanowsky
C) Prusiner
D) Stanley
E) Rous




Answer: C

How is the HIV provirus different from a lambda phage prophage?

How is the HIV provirus different from a lambda phage prophage?

A) The HIV provirus is integrated permanently into the host cell's DNA.
B) All subsequent generations of HIV-infected cells carry the provirus.
C) All the offspring of a cell infected with a prophage will contain the virus.
D) The HIV provirus is inactive inside the host cell.
E) Lambda phage-infected cells produce virus slowly over time.

Answer: A

The majority of cases of infant diarrhea are caused by what kind of virus?

The majority of cases of infant diarrhea are caused by what kind of virus?

A) dsDNA viruses
B) dsRNA viruses
C) +ssRNA viruses
D) retroviruses
E) -ssRNA viruses




Answer: B