Cross presentation alerts ______ cells by providing ___________. A: TC; exogenous antigen on MHC I B: TC; endogenous antigen on MHC II C: TH; exogenous antigen on MHC I D: TH; endogenous antigen on MHC II

Methods for post-translational regulation are still in their infancy, as a generalized system to control synthetic and endogenous proteins has not yet been reported. As synthetic systems have become larger and lesser complex, their interactions with endogenous systems have become more pronounced.

Which of the following pigments is a not endogenous pigment? A: hemosiderin B: lipofuscin C: bilirubin D: carotene

Biological samples should be extracted under acidic conditions to reduce the interference of endogenous substances (mostly acidic) in the biological matrix.

Which of the following descriptions are correct? A: Class I MHC present endogenous antigens to CD4+ T cells B: Class I MHC present endogenous antigens to CD8+ T cells C: Class II MHC present exogenous antigens to CD4+ T cells D: Class II MHC present exogenous antigens to CD8+ T cells

MHC class II molecules can present___. A: Endogenous antigens B: Exogenous antigens C: Both A and B D: Neither A nor B

which of following do not belong to pathogenic variations of the endogenous genes ( ) A: gene amplification B: abnormal gene expression C: invasion of the foreign genes D: gene arrangement E: point mutation

The main source of vitamin D in the human body is （） A: endogenous D synthesized by skin B: vitamin D in egg yolk C: vitamin D in pig liver D: vitamin D in milk

在经济模型中，内生变量（endogenous variables）是指该模型所要决定的变量，其可以在模型体系内得到说明

Apparent metabolizable energy（AME）is the remaining energy after subtracting（ ）from the gross energy. A: Fecal energy B: Urine energy C: Metabolizable fecal energy D: Gas energy E: Endogenous urine energy