The cell membrane allows cells to interact with their environment and is responsible for-

The ER processes proteins and prepares them for transport and secretion. The cell membrane receives the vesicles that contain proteins tagged for secretion from the cell. The RNA has to interact with all of the organelles in the cell. The RNA especially has to communicate with the organelles within the nucleus.

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.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.