The information for synthesizing a particular RNAis located in only one of the two DNA strands. The strand that contains the information for making an RNA molecule and that is "read" by an RNA polymerase is called the template strand or the sense strand. The strand that is complementary to the template is sometimes called the nonsense strand since it provides no information for the making of RNAor protein. Not all templates for coding RNAs occur on the same strand of DNA , however. Messenger RNAthat specifies the synthesis of a protein is called sense RNA, whereas RNA complementary to sense RNA is called antisense RNA.
Most genes, especially those encoding proteins, are regulated so they are expressed at the appropriate time and level needed to maintain the cell or to promote its growth and proliferation.
Gene expression includes both transcription and translation!
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