About the homologous chromosomes, which is not correct（）
A. One comes from mother, the other comes from father
B. They are the same length and show the same morphology
C. They are two chromosomes coming from chromosome duplication in S pahse
D. They can form synapsis complex
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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
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）
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