Exam 1 Set 4

Question 1

Some viruses contain an oncogene. What is an oncogene?

Answer 1

A gene with the potential to cause cancer

Question 2

Describe two specific mechanisms by which influenza virus can change from year to year

Answer 2

Genetic shuffling: One cell gets infected with two viruses.Each virus has multiple chromosomes.Chromosomes get shuffled inside cell, producing a virus with some chromosomes from one parent virus and some chromosomes from another parent virus.

Random mutation: When viral nucleic acid gets copied, a mutation is made, leading to production of a mutant protein.

Question 3

What is the difference between an epidemic and a pandemic?

Answer 3

Epidemic is a widespread occurrence of an infectious disease in a community at a particular time

Pandemic occurs very widely nearly globally

Question 4

What human viral disease has been eradicated? And how was it eradicated?

Answer 4

Smallpox

Worldwide vaccination campaign