1. what is "cell differentiation"? 2. what are the characteristics of cell differentiation in the development process? 3. what is the nature of cell differentiation? 4. what are the regulation methods of cell differentiation?
the following ( ) substances can easily pass through the cell membrane and transfer the information they carry into the cell.
neurons usually have () axons, and 1 or more dendrites.
the cell membrane is positively charged outside, and the cell membrane is negatively charged. this is the cell ( ).
the relaxation of blood vessels is mainly controlled by ( ) located in blood vessels.
the principle that dna and rna can be hybridized is that ().
proto-oncogenes in normal cells are ().
which of following statements about the relationship between inidual senescence and cellular senescence is incorrect?
which of the following statements about the characteristics of senescent cells is incorrect?
the allest cell is ().
下列不属于内部招聘渠道的是()。
which of the following statements of the main characteristics of cellular senescence is?
the formation of human body current is mainly due to ( ).