The correct answer is b. False. In gene expression in eukaryotes, the primary transcript, also known as the pre-mRNA, is not transported directly to the cytoplasm and is not ready for translation.
After transcription, the primary transcript undergoes several processing steps in the nucleus before it is transported to the cytoplasm. These processing steps include the removal of introns (non-coding sequences), the addition of a poly-A tail to the 3' end of the transcript, and the addition of a 5' cap to the 5' end of the transcript. These modifications are necessary for the proper function and stability of the mRNA molecule.
Only after these processing steps are complete is the mRNA molecule transported to the cytoplasm, where it can be translated by ribosomes into a protein. Therefore, the statement that the primary transcript is transported unchanged directly to the cytoplasm and is ready for translation is false.