A particular gene does NOT constantly churn out the same protein at all times in every cell. This is true for two reasons. First, can allow one gene to produce several different proteins. Second, genes are constantly being turned on and off through the process of .

Explanation:

The process by which a pre-mRNA undergo various  modification so that it can become a mature RNA is called RNA processing . During RNA processing, splicing is an important step. During splicing, the introns are precisely excised and exons are ligated together. A process of alternative splicing is excised by which more than one mRNA species can be produced from a single pre-mRNA. Thus mRNA processing is the method that allows  a gene to produce different proteins. secondly, the regulation of genes initiate the control of gene products.

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d. the weight of the book