Assess the Following Statements and Determine Which One Is Incorrect

question 55

Multiple Choice

Assess the following statements and determine which one is incorrect regarding antigenic shift.

• A)The influenza virus genome mutates over time changing the amino acid sequence of the envelope glycoproteins.  Each encounter with a new version of the virus requires activation of naive lymphocytes rather than memory cells,which is the reason we receive a new vaccination each year.
• B)The influenza genome contains 10 genes distributed on 8 separate RNA strands.  These strands can be exchanged between different viruses.
• C)Some virus strains infect birds and swine,some infect swine and humans.  If the strain that infects swine and humans exchanges strands with a bird flu strain while in a swine host cell,that virus can go on to infect a human who will have no recognition for the bird protein.
• D)If a new strain of virus emerged from an antigenic shift event,a vaccine different to the annual flu vaccine would have to be administered because the proteins coded for by the new strain would be different to those made as a result of antigenic drift.

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Definitions:

Mutation

A change in the DNA sequence of an organism's genome, which can lead to differences in physical traits or bodily functions.

Genetic Structure

The organization and arrangement of genetic information within an organism or cell, including chromosomes and genes.

Liposarcoma

A rare type of cancer that arises in fat cells in deep soft tissue, such as that inside the thigh or in the retroperitoneum.

Tumor

A cluster of tissue that becomes unusual because cells multiply excessively or avoid programmed cell death.