Which phase of a fungal life cycle is best adapted to growing in a host's body?
A. yeast
B. hyphal
C. conidial
D. filamentous
查看答案
What property of the retroviruses enables them to integrate into the host genome?
A. the RNA they carry
B. presence of glycoprotein receptors
C. presence of integrase
D. a positive-sense genome
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 _________.
A. oncogenic
B. latent
C. cytopathic
D. resistant
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.
微信支付 
支付宝支付