Why do we think that some cell signaling molecules have a long evolutionary history?

Cell signaling involves the relationship between a cell and its receptor which gets the hormones and other agents which controls the activity of the cell.

Explanation:

It can be classified as mechanical or biochemical depending upon the kind of signal. Mechanical signals are the forces produced by the cell or exerted by the cell. Biochemical signals are derived by the biomolecules like proteins, ions, gases, and lipids. These biomolecules have an evolutionary history as they are developed during the primitive atmosphere of earth by the inorganic molecules of carbon dioxide, methane, and water present in the primitive earth's atmosphere. These molecules are basis of development of life as they were responsible for generation of biomolecules like proteins, and lipids necessary for sustaining life on earth.

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

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