PS15:i need very good quality answer

i need very good quality answer
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Question 1
1.

 

The primary reason for the incredible success of viruses in their incredible diversity. The primary
sources of this diversity are Blank 1 Blank 2 Blank 3 Blank 4
Answer
2 points   

Question 2
1.

 

Briefly describe why viruses are said to exist as populations of sequences and not single 
sequences. What is the technical term for this concept.
Answer

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2 points   

Question 3
1.

 

The primary reason Human infections by Ebola virus are largely localized to parts of Africa is 
which of the following (select one)?
Answer
A
.

Africans have a gentic polymorphism that enhances their resistance to malaria, but makes
 them more susceptible to Ebola (and other filovirus) infections.
B. Ebola is used as a bio­weopon  by government militias fighting political instability in 
central Africa.

C. The primary animal reservoir for the Ebola virus is geographically restricted to Africa
D
.

The warm dry climate in Africa enables the virus to remain active outside the host for 
extended periods.
2 points   

Question 4
1.

 

The higher the mutation rate of an RNA virus, the more likely the virus will be able to succeed.
Answer
 True
 False
1 points   

Question 5
1.

 

Although the polio virus has been around for centuries, it only became a significant health 
problem in the developing world in the 20th century due to (select one)?
Answer

Polio was transmitted to humans by a zoonosis in the 1930's
Vaccination programs for polio began
Loss of natural vaccination due to improved sanitation.
Virus evolved to more pathogenic form
Humans were better able to travel and migrate which enhanced dissemination of the virus
2 points   

Question 6
1.

 

The graph below shows the relationship between viral genome size and mutation rate. Explain 
the observed relationship between genome size and mutation rate (3­5 sentences max).
Note: The mutation rate is expressed as the number of substitutions per nucleotide per 
generation,. For viruses a generation is defined as a cell infection in viruses (?s/n/c).

Answer

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2 points   

Question 7
1.

 

Coronaviruses are a class of ssRNA viruses that are responsible for a number of respiratory 
diseases including SARS and the recently identified Middle Eastern Respiratory Syndrome 
(MERS). Coronaviruses are the largest known RNA viruses with genomes ranging from 26­32 
kb. Coronaviruses are able to achieve such large genomes because they possess a gene not found 
in other RNA viruses. Using what you have learned this semester, speculate in 3­4 sentences the 
likely function of this gene that enables coronaviruses to possess such large genomes. Justify 
your answer.
Answer

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2 points   

Question 8
1.

 

RNA viruses tend to occupy broad ecological niches with multiple host species, while DNA 
viruses tend to coevolve with host with fewer host species.
Answer
 True

 False
1 points   

Question 9
1.

 

List three factors that explain why there appears to be an increase in the number Emerging Viral 
Diseases globally. Justify each factor in 1­2 sentences.
Answer

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2 points   

Question 10
1.

 

Match the following Emerging viruses with the disease or symptoms they cause.
Answer
                                                             

Answer
Polio Virus
A.
Read Answer 
Items for 
Question 10

                                                             

                                                             

Transmission of virus
to humans is highly 
dependent on 
West Nile 
climate/weather 
Virus
because it influences 
Read Answer 
populations of rodent 
Items for 
Question 10
vector
B. Emerged due to improved sanitation that 
Sin 

Nombre

broke natural vaccination cycle

Read Answer  Virus was brought to Americas by earlier 
C.
Items for 
Question 10 explorers. Beliveved to have wiped out 
                                                             

native populations because they did not 
Severe 
have immunity to virus.
Acute 
D
RespiratoryFirst major viral epidemic documented to 
.
Syndrome  be spread by air travel
Virus E. Brought to United States by insect vector
Read Answer 
Items for 
Question 10

                                                             

Variloa
Read Answer 
Items for 
Question 10

2 points   

Question 11
1.

 

Explain why a virus that is well adapted to one species and causes no apparent disease can upon 
a switch to a new host range cause severe disease (Max 3­5 sentences)?
Answer

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2 points   

Question 12
1.

 

What is the last name of the scientsist who accredited with the following quote:
"In the battle by attrition, humans have a real problem competing with microorganisms. Here we are, here are the 
bugs, they're looking for food, we're their meal in one sense or another, how do we compete?"
Answer
1 points (Extra Credit)   

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