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The left diagram shows a steroid (lipid) hormone (1) entering a cell and (2) binding to a receptor protein in the nucleus, causing (3) mRNA synthesis which is the first step of protein synthesis. The right side shows protein hormones (1) binding with receptors which (2) begins a transduction pathway. The transduction pathway ends (3) with transcription factors being activated in the nucleus, and protein synthesis beginning. In both diagrams, a is the hormone, b is the cell membrane, c is the cytoplasm, and d is the nucleus.
Transcription. The primary role of deoxyribonucleic acid (DNA) is to direct the synthesis of proteins. DNA, however, is located in the nucleus of the cell, and. Figure 1. Protein synthesis requires transcription (shown on the left side of the figure) and translation (shown on the right side of the figure).here is no task more important to the function of living cells than the synthesis of proteins. Because proteins carry out so many different tasks, the mechanism to synthesize them is intricate. There are several stages involved in the synthesis process, including transcription and translation.