Ch 13 Test Flashcards Preview

BIO 119-352 > Ch 13 Test > Flashcards

Flashcards in Ch 13 Test Deck (24):
1

Put the terms in order, from the simplest to most complex: virion, capsomer, capsid, nucleocapsid

capsomer, capsid, nucleocapsid, virion

2

Ebola virus, which has an RNA genome, infects endothelial cells that line blood vessels. Within these infected cells, synthesis of viral proteins takes place

NOT VIRAL RIBOSOMES THAT ARE RELEASED FOLLOWING UNCOATING OF THE CAPSID

3

Infections with enveloped animal virus may have persistent infections because ____ allows the cells to stay alive longer and shed virions.

budding

4

Put the stages of the Lytic Replication cycle in order, from earliest to latest stages: synthesis, assembly, attachment, release, entry, bacterial chromosome degraded

attachment, entry, bacterial chromosome degraded, synthesis, assembly, release

5

Reverse transcriptase is associated with which virus?

retroviruses

6

How are prions different from all other known infectious agents

they lack nucleic acid

7

Which is not true about the HIV provirus and a temperate prophage?

NOT: THE HIV PROVIRUS INFECTS ANIMAL CELLS AND THE PROPHAGE INFECTS BACTERIA

8

Which agents are capable of inducing conversion of a prophage back to a lytic phage?

UV light and X rays

9

Host specificity for attachment is determined both by viral proteins and host ____.

receptors

10

Type of nucleic acid, envelope, shape, and size are all used to ____ a virus.

classify

11

In the phage lytic replication cycle, areas of dead lysed bacteria cells are called _____.

plaques

12

Viroids infect _____ and viroid-like agents infect ___.

plants; fungi

13

Outside the cell, Ebola is called _____, inside the cell it is called ___.

virion; virus

14

Ebola virus is an enveloped virus that acquires its outer covering when _____.

an envelope is acquired during budding release through a host cell's membrane.

15

The three viral shapes are

helical, polyhedral, complex

16

In terms of size, bacteria are in the _____ range and viruses are in the _____ range

micron; nanometer

17

Which type of animal virus requires an RNA-dependent RNA transcriptase before proteins can be translated

-ssRNA viruses

18

Plant diseases can be caused by infectious RNA molecules lacking capsids

true

19

Which statement concerning viruses is not true?

viruses enter a cell to complete the replication they have begun outside the cell

20

Bacteriophage genes that cause toxin production in a possibly otherwise harmless bacterial species are examples of

lysogenic conversion

21

some viruses have an outer membrane called an ____

envelope

22

viruses contain ___ or ____ but not both

DNA; RNA

23

____ ____ virus was the first virus to be discovered and characterized

tobacco mosaic

24

viral capsids can assume one of ___ basic shapes

three