Which of the following statements about non-collagen adhesive proteins is wrong? A: The fibronectin mediates cell to cell adhesion. B: The molecular structure of fibronectin exhibits multi- domains for specific function. C: RGD tripeptide is the smallest structural unit of non-collagen binding proteins in ECM for cell to associate. D: Laminin is a hetero-trimmer protein composed of three polypeptide chains of α、β and γ.

Cartilage capsule is ( ) A: loose connective tissue at the surface of cartilage B: dense connective tissue at the surface of cartilage C: space around cartilage cells D: cartilage matrix around cartilage cells E: collagenous fibers around cartilage cells

Directions: Revise the following sentences where necessary. The purpose of this study was to investigate the phenomenon of tissue integration of porcine dermal collagen membrane (PDCM) in vivo.

As to the healing of ulcers, the result is___ A: Epithelium and granulation tissue B: Fibroblasts and muscle tissue C: Muscle cells and connective tissue D: Lymphocytes and lymphoid tissues E: No shortage of fixed cells and tissues

Smear is used to observe() A: blood B: bone C: connective tissue D: eye E: most organs