In influenza virus, antigenic shift

A. results from reassortment of genomes when two different strains of flu viruses infect the same cell.
B. can result in major epidemics or pandemics.
C. results from the accumulation of mutations in HA and NA in a single strain of flu virus.
D. results from reassortment of genomes when two different strains of flu viruses infect the same cell and can result in major epidemics or pandemics.


Answer: D

Biology & Microbiology

You might also like to view...

Interferons promote viral replication

Indicate whether the statement is true or false.

Biology & Microbiology

Morphological traits are commonly used to identify species, which of the following can also be used?

A. The ability to interbreed. B. Molecular similarity (DNA and chromosome comparisons). C. Ecological factors. D. Evolutionary relationships. E. All of these.

Biology & Microbiology

Four of the five organisms listed below are

autotrophs. Select the exception. a. self-nourishing organisms b. organisms whose carbon source is CO2 c. chemosynthetic organisms d. most bacteria e. sulfur bacteria

Biology & Microbiology

The __________ biome is found in states such as Iowa, Minnesota, Nebraska, and other Midwestern

states, and is characterized by thick, rich soils, and a thick mat of sod. a. savannah b. tallgrass prairie c. taiga d. temperate deciduous forest e. chaparral

Biology & Microbiology