Cancel
© 2016 start-seeking.ru
card-image
camera

Chapter 19- Viruses

Set Details Share
Helpfulness: +5
created 4 years ago by tieshasecret12
103,507 views

Grade levels:
6th grade, 7th grade, 8th grade, 9th grade, 10th grade, 11th grade, 12th grade, College: First year, College: Second year, College: Third year, College: Fourth year

show more
1

The nucleic acid of a virus particle is enclosed in a protein coat. What is it called?

capsid

2

What do we call a virus that attacks a bacterium?

phage or bacteriophage

3
card image

The pointer is indicating the virus's _____.

genome

4

Viral DNA makes mRNA by the process of _____.

transcription

5

The lytic cycle of bacteriophage infection ends with the _____.

rupture of the bacterium

The bacterium ruptures and phages are released.

6
card image

The pointer is indicating the _____.

viral protein coat
the viral protein coat surrounds its genome

7

As a result of the lytic cycle, _____.

the host cell's DNA is destroyed

The host cell's DNA is destroyed, and ultimately, the host cell itself is destroyed in the lytic cycle.

8
card image

The arrow is indicating _____.

a prophage

9

In the lysogenic cycle _____.

viral DNA is replicated along with host DNA

10
card image

Cycle A is the _____ cycle and cycle B is the _____ cycle.

lytic ... lysogenic

11

Sort the items according to whether they may be found only in free virus particles, only in uninfected host cells, or in both viruses and host cells.

viruses only: capsid, envelope with glycoproteins, capsomere (core protein)

host cell only: ribosome

both: DNA, RNA, Protein

12
card image

The genetic material of HIV consists of _____.

single-stranded RNA

The genetic material of HIV consists of two molecules of single-stranded RNA.

13
card image

Which of these binds to receptor molecules on the host cell membrane?

A

Glycoproteins on the viral envelope recognize and bind to receptors on the host cell.

14

What is the function of reverse transcriptase?

It catalyzes the formation of DNA from an RNA template.

15

What is the source of a viral envelope?

host cell membrane

16
card image

Which of these is reverse transcriptase?

C

17

Which of these is the viral genome?

E

HIV is an RNA virus.

18

What enzyme is responsible for the process seen here?

reverse transcriptase

Reverse transcriptase catalyzes the formation of DNA from an RNA template.

19

Double-stranded viral DNA is incorporated into a host cell as a _____.

provirus

"Provirus" is the name given to double-stranded viral DNA that has been incorporated into a host cell's genome.

20

How does HIV cause disease?

HIV kills cells that defend the body against disease.

21

How do enveloped viruses differ from nonenveloped viruses?

They have a membrane-like outer covering.

22

Which replicative cycle describes a virus that can integrate its genome into the host cell's genome?

Lysogenic

23

Which enzyme inserts viral DNA into the host's chromosomal DNA?

Integrase

24

How does HIV bind to a host cell?

The viral envelope proteins interact with CD4 and a co-receptor on the cell membrane.

25

Which of the following events stimulates the production of viral particles in a host cell?

Activation of the host cell by cytokines, growth factors, or antigens.

26

True or false? The human immunodeficiency virus (HIV) uses reverse transcriptase to make double-stranded RNA copies of its DNA genome.

False

A retrovirus such as HIV has an RNA genome and uses reverse transcriptase to make double-stranded DNA copies of the genome, which can then be integrated into the host cell's genome.

27

Why are viruses called obligate intracellular parasites?

They must use a host cell's nucleotides for transcription and replication.

They must use a host cell's amino acids to synthesize proteins.

They must use a host cell's ribosomes to synthesize proteins.

They must use a host cell's metabolic enzymes and pathways to obtain energy.
All of the above.

28

Why are retroviruses considered a special class of viruses?

They transcribe RNA to DNA using reverse transcriptase.

29

HIV uses which of the following processes to synthesize a DNA strand using its RNA genome as a template?

reverse transcription

30

What is the most effective way to stop viral infections?

vaccines
Vaccines stimulate the immune system to recognize and effectively fight off invading viruses. They have proven to be the most effective weapon against viruses.

31

A plant that has been raised in a sterile environment shows symptoms of a viral infection. How would you explain this?

The viral infection was acquired by vertical transmission.

32

The H1N1 2009 outbreak is considered to have been which of the following?

a pandemic

33

How do prions, which are misfolded proteins, infect organisms?

Prions enter brain cells and cause normal forms of the protein to refold into the prion form.

34

Why do RNA viruses appear to have higher rates of mutation?

Replication of their genomes does not involve proofreading.

35

Emerging viruses arise by

the spread of existing viruses to new host species.
mutation of existing viruses.
the spread of existing viruses more widely within their host species

36

Which of the following characteristics, structures, or processes is common to both bacteria and viruses?

genetic material composed of nucleic acid

37

To cause a human pandemic, the H5N1 avian flu virus would have to

become capable of human-to-human transmission.

38

RNA viruses require their own supply of certain enzymes because

host cells lack enzymes that can replicate the viral genome.

39

How does a virus differ from a bacterium?

Viruses, unlike bacteria, lack metabolic enzymes.

Viruses lack metabolic enzymes and equipment for making proteins, such as ribosomes.

40

Why is it ineffective to treat viral disease with antibiotics?

Antibiotics inhibit enzymes specific to bacteria and have no effect on virally encoded enzymes.

41

How do prions differ from viruses?

Unlike a virus, a prion is a single molecule.
Unlike viruses, prions are infectious proteins.
Unlike viruses, prions do not include any nucleic acids.


Related pages


crayfish mandiblelymphocytes are activated by binding with antigens onblot hemorrhage eyewhat bone forms the foreheadpharmacology atimicrobiology chapter 13 viruses viroids and prionsossification of the ends of long bones ________frontal section kidneythe smooth er that stores calcium ions is theanimal cell ribosomesorbital notation of nitrogenduodenum structurelowest recorded iqthe evolution of eukaryotic cells most likely involvedmicroscope labellingthe single-step income statement emphasizesthree checks of medication administrationchemical barriers in the immune systemhesi a2 review questionscanine forelimblord of the flies study guide answersgerman numbers 1-100douglas macarthur apushto kill a mockingbird quizzesdifference between leading and lagging strand in dna replicationtexas government quizletuniform fine turbiditypalpable cord dvtmethyl red voges proskauergre vocabulary gamesystem that exchanges oxygen and carbon dioxidemitosis in animal cellradiographic film artifactsmedical word for incisionmonomer rnacliff notes ap biowhat is intrapleural pressurethe smallest particle of a compoundisovolumetric relaxationrhit exam flashcardsorganic chemistry functional groups quizchapter 7 anatomy and physiologycardiovascular and lymphatic systemaction of orbicularis orisradiometric dating _____enzyme complexesthe coriolis effect influences wind speed but not wind directiondill tkamfully describe the anatomical position for the human bodystrom thurmond apushthe peripheral nervous system includes the brain and spinal cordmean median and mode quizwhich best describes the first law of thermodynamicsthalamic neurons that project to the primary sensory cortex are2 methyl 1 butanaltongs laboratoryserous fluidstructures of the brain quizwhat organ produces glucagoncampbell biology textbookisotonic plant cellkeystone species are those speciessimple labelled diagram of the hearthuman anatomy and physiology practice testbacteria and archaea are similar in which of the followingabrasion and plucking generally involve what part of a glacierthe coriolis effect influences wind speed but not wind directioncholinergic agonistswhat type of fiber is embedded in loose connective tissueparts of the microscope quizcharles darwin phototropismexample of sequent occupancethe visceral pericardium is also called themasseter muscle attachmentsystemic capillarieslocation of the hepatopancreatic sphincteris mgcl2 ionic or covalentdoes smooth muscle regeneratebutterfly syringe drawing bloodap bio photosynthesis testmedullary pyramidthe act or ceremony of installing a president into officegriffith mice experiment