细胞表面（cell surface)

细胞表面受体(cell surface receptor)

细胞表面黏着因子(cell adl]esion molecules，CAMS)

A．错误

B．正确

A、has the intact cell membrane

B、has the cytoplasm as well as degraded chromatins

C、Loss of membrane integrity

D、Microvilli on cell surface disappear

A.a

B.b

C.c

D.d

A hematopoietic stem cell is defined as

A．a cell with extensive self-renewal and proliferative potential

B．a cell only to produce daughter cells with identical characteristics

C．a cell with the capacity to differentiate into the progenitors of all the blood cell lineages

D．a cell With the capacity to produce some hematopoietic growth factors such as SCF，GM-CSFs，et．a1．

E．a cell with the capacity to express some specific surface antigens such as CD34

PPL scientists will try to solve their problem by

A．removing the sugar molecule on the surface of pig cells.

B．distinguishing human tissues form. those of pigs.

C．using the sugar-free nucleus in cloning a pig.

D．taking out the sugar genes from the cell of a pig.

A、Transmission routes of 2019-nCoV and controls in dental practice

B、Analyzing the epidemiological outbreak of COVID-19: A visual exploratory data analysis approach

C、Coronavirus disinfection in histopathology

D、Immunoinformatics-aided identification of T cell and B cell epitopes in the surface glycoprotein of 2019-nCoV

E、The 2019 Novel Coronavirus (2019-nCoV): Novel Virus, Old Challenges

A.游离面没有纹状缘

B.细胞侧面没有连接复合体

C.细胞为单层柱状

D.细胞表面没有细胞衣