Final answer:
The assembly of ribosomes begins in a small dense structure called the chromatin." is b) false because The process of ribosome assembly does not begin in the chromatin; instead, it starts in the nucleolus, a dense area within the nucleus where rRNA is aggregated with proteins to form ribosomal subunits.
Step-by-step explanation:
The statement that the assembly of ribosomes begins in a small dense structure called the chromatin is false. The correct site for the assembly of ribosomes is actually a darkly staining area within the nucleus known as the nucleolus. The nucleolus (plural nucleoli) is responsible for aggregating ribosomal RNA (rRNA) with associated proteins to assemble the ribosomal subunits. These ribosomal subunits are then transported out to the cytoplasm through the pores in the nuclear envelope, signifying the nucleolus as the central hub for the initial phase of ribosome synthesis.
Addressing a specific aspect of ribosome production, chromosomes within the nucleus have specialized sections of DNA that encode rRNA, marking the nucleus—and particularly the nucleolus—as the key site for synthesizing the RNA components of ribosomes. This ribosomal RNA, when combined with proteins, forms the small and large subunits of the ribosome, which are essential for the subsequent process of protein synthesis. So the answer is option b.