A2.3 病毒（細胞，HL）：练习题

• a.

  Only the lytic cycle requires the host cell's ribosomes for protein synthesis

• b.

  The viral genome is integrated into the host genome in the lysogenic cycle but not in the lytic cycle

• c.

  The lytic cycle involves RNA viruses, while the lysogenic cycle involves DNA viruses

• d.

  The lysogenic cycle results in immediate cell death, whereas the lytic cycle does not

• a.

  Synthesized de novo by viral enzymes in the cytoplasm

• b.

  The plasma membrane of the host cell during budding

• c.

  The mitochondrial inner membrane of the host cell

• d.

  The peptidoglycan layer of the bacterial cell wall

• a.

  Antigenic drift occurs when the virus switches hosts, whereas antigenic shift occurs through genetic recombination within a single host.

• b.

  Antigenic drift is a slow process leading to new pandemics, while antigenic shift is a rapid process causing seasonal epidemics.

• c.

  Antigenic drift involves minor changes in hemagglutinin (HA) and neuraminidase (NA) proteins due to point mutations, while antigenic shift involves major reassortment of viral RNA segments when two different strains co-infect a cell.

• d.

  Both antigenic drift and shift result from the integration of viral DNA into the host chromosome, leading to altered protein expression.

• a.Catalyzing the synthesis of viral RNA.
• b.Inhibiting the host cell's immune response.
• c.Providing structural support to the internal capsid.
• d.Attachment to specific receptors on the host cell membrane.

• a.

  The viral DNA is integrated into the host cell's genome and replicated along with it.

• b.

  The viral envelope is used to fuse directly with the nuclear membrane of the host.

• c.

  The virus uses its own ribosomes to synthesize viral proteins in the cytoplasm.

• d.

  The host cell is immediately ruptured to release hundreds of new viral particles.

先自己写一遍答案，再对照解题步骤。

先自己写一遍答案，再对照解题步骤。

先自己写一遍答案，再对照解题步骤。