Final Answer:
Cellular protein synthesis proceeds in d. 5´ to 3´
Step-by-step explanation:
The correct direction for cellular protein synthesis is from the 5´ to the 3´ end of the mRNA molecule. This process involves the translation of the mRNA sequence into a polypeptide chain in the ribosome. The mRNA is read in a d.5´ to 3´ direction, and as the ribosome moves along the mRNA, amino acids are added to the growing polypeptide chain in a sequential manner.
In the context of molecular biology, the directionality of nucleic acid synthesis and processing is crucial. The genetic code in mRNA is read in a 5´ to 3´ direction, meaning that the ribosome moves along the mRNA strand from the 5´ end to the 3´ end. This directional movement ensures the accurate and sequential addition of amino acids during protein synthesis.
The alternatives (a, b, and c) are incorrect because they describe processes or directions that are not consistent with the established principles of cellular protein synthesis.
Understanding the directional flow of genetic information is fundamental to comprehend the intricate processes occurring in cellular protein synthesis. The 5´ to 3´ directionality ensures the fidelity of the translation process, allowing cells to faithfully convert genetic information from nucleic acids into functional proteins.