【单选题】Th0 cells differentiate into Th1 cells under the action of which cytokines
【单选题】For effect Th1 cells, which of the following is not correct ?
A.
Mainly mediate defense against infections by intracellular microbes.
B.
Act in stimulating clonal expansion and differentiation of CD8+T cells.
C.
Interact with B cells and induce B cell activation and differentiation into plasm cell.
D.
Secret IFN-r and activate macrophage and NK cells.
E.
Secret IL-2 and activate neutrophils.
【单选题】—The guard keeps watch at the gate. —So he does. Only those knows well could be let in.
【判断题】The stomatal pores are closed when guard cells are turgid.
【判断题】The main osmotic agent for opening guard cells is sucrose
【判断题】Closed guard cells are turgid
【判断题】u质量等级符号为A、B、C、D、E。由A到E,其P、S含量依次上升,质量下降。