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Which of these happen(s) in the case of antigenic shift in influenza A?

A. single mutations in hemagglutinin
B. recombination of RNA segments between bird and human strains
C. change from influenza A to influenza B
D. both a and b

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Viruses that persist in the cell and cause recurrent disease are considered _________.

A. oncogenic
B. latent
C. cytopathic
D. resistant

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Which of the following statements is false?

A. Viruses contain DNA or RNA.
B. The nucleic acid of a virus is surrounded by a protein coat.
C. Viruses multiply inside living cells using viral mRNA, tRNA, and ribosomes.
D. Viruses cause the synthesis of specialized infectious elements.

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The envelope of an animal virus is derived from the ______ of its host cell.

A. cell wall
B. glycoproteins
C. membrane
D. receptors

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Primary pathogenic fungi differ from opportunistic fungi in being ________.

A. more virulent
B. less virulent
C. more prevalent
D. more transmissible

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Which of these happen(s) in the case of antigenic shift in influenza A?

A. single mutations in hemagglutinin B. recombination of RNA segments between bird and human strains C. change from influenza A to influenza B D. both a and b

Viruses that persist in the cell and cause recurrent disease are considered _________.

Which of the following statements is false?

The envelope of an animal virus is derived from the ______ of its host cell.

Primary pathogenic fungi differ from opportunistic fungi in being ________.

A. single mutations in hemagglutinin
B. recombination of RNA segments between bird and human strains
C. change from influenza A to influenza B
D. both a and b