超星 - 阶段练习

单选题

Which of the following statements is correct about Ag?

A. TD-Ags only contain T epitope.
B. TI-Ags may cause cellular immune response and humoral immune response.
C. TI-Ags may induce immune memory.
D. TI-Ags can stimulate the production of IgG and IgM.
E. There is MHC restriction in the immune response to TD-Ags.

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单选题

Which class of Ig has secretory piece?

A. IgG
B. IgM
C. SIgA
D. IgE
E. IgD

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单选题

Which statement regarding fungal growth and morphology is correct?

A. Pseudohyphae are produced by all yeasts
B. Molds produce hyphae that may or may not be partitionedwith cross-walls or septa
Conidia are produced by sexual reproduction
D. Most yeasts reproduce by budding and lack cell walls
E. Most pathogenic dimorphic molds produce hyphae in thehost and yeasts at 30℃

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单选题

The skin is a barrier to virus entry, but a few virusesare able to breach this barrier and initiate infection of the host. Which of the following is an example of a virus that entersthrough skin abrasions?

Adenovirus
B. Rotavirus
C. Rhinovirus
D. Papilloma virus
E. Influenza virus

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单选题

Some viruses encode for a viral RNA-dependent RNA polymerase. Which of the following states a principle about viralRNA polymerases?

All RNA viruses carry RNA polymerase molecules insidevirus particles because they are needed to initiate the nextinfectious cycle.
B. Antibodies against the viral RNA polymerase neutralizevirus infectivity.
C. Negative-strand RNA viruses supply their own RNAdependent RNA polymerasebecause eukaryotic cells lacksuch enzymes.
D. The viral RNA polymerase protein also serves as a majorcore structural protein inthe virus particle.

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单选题