Type of diffusion that occurs with the help of a protein is called

Explanation:

1. Diffusion: it  is the net passive movement of particles from  higher concentration to lower concentration. Diffusion continues until the concentration of substances is equal through out.

2. Facilitated diffusion: is the  process of passive transport of molecules or ions across a biological membrane and requires (via) a specific carrier protein.

3. Facilitated diffusion is passive type and require specific protein and it  requires no energy from the cell.  

4. It requires specific proteins through which molecules move from one side to another.

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explanation:

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.