intestinal cells absorb aa and peptides. these cells finish splitting peptides into individual aa.
举一反三
- Immature thymocytes (DN developing T cells) share what surface proteins with germ cells <br/>and neural crest cells? A: the C-Kit receptor B: class II MHC molecules C: B7 D: the cytoplasmic signaling peptides (ζ, ε, etc.) of the CD3 E: CD8 and CD4
- Which of the following is least likely to be associated with an increase in the inflammatory <br/>response? A: necrosis of cells, followed by phagocytosis of neutrophils B: release of peptides curing cleavage of fibrinogen to fibrin (blood clotting) C: cleavage of C5 during complement activation D: apoptosis of surplus healthy cells E: secretion of IFNγ by macrophages and TH cells
- Which of the following is a germ cell? A: cells of the gonads B: intestinal cells C: sperm and eggs D: zygotes
- Which of the following would NOT be a function of MHC I? A: display peptides derived from turnover of a cell’s own proteins B: down-regulate the activity of NK cells C: in cross presentation, display pathogenic peptides acquired by phagocytosis D: signal that a red blood cell is old and should be removed and recycled E: bind CD8 when the cell interacts with a Tc cell
- 二倍体玉米Aa先加倍成AAaa,再用花药离体培养培养得到的个体基因型为：AA、Aa、aa,可以是纯合体（AA、aa）,也可以是杂合体Aa.