According to the differentiation potential, which of the following sequence is correct（）
A. embryonic stem cell—fetal stem cells—totipotent stem cells
B. totipotent stem cells—adult stem cells—embryonic stem cells
C. pluripotent stem cells—adult stem cells—umbilical cord stem cells
D. unipotent stem cells—multipotent stem cells—totipotent stem cells
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Which description is correct about the relationship between cell cycle and cell differentiation（）
A. The cell cycle and cell differentiation is positive related
B. The cell cycle and cell differentiation is negative related
C. The cell cycle and cell differentiation is not directed related
D. The relationship between cell cycle and cell differentiation is random
About the tryosine kinase receptor, which statement is not correct（）
A. It is the transmembrane glycoprotein
B. Its cytoplasmic part has the G protein binding region
C. Its C-terminal region contains tyrosine with tyrosine protein kinase （TPK） activity
D. Its tyrosine protein kinase （TPK） can phosphorylate the tagert protein
Which is not the chemical component of microtubule（）
A. a-tubulin
B. β-tubulin
C. histone
D. microtubule associated proteins（MAP）
Which description is not correct about the IF（）
A. The diameter of IF is between microtubule and microfilament
B. IF is not so stable as microtubule and microfilament
C. IF is the most complex component in cytoskeleton
D. The rod-shape region of IF is compsed of alpha helix of about 310 amino acids
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