Final answer:
The incorrect statement regarding eukaryotic ribosomes is that the small subunit catalyzes the formation of peptide bonds; this function is actually carried out by the large subunit during translation.
Step-by-step explanation:
The statement about eukaryotic ribosomes that is not correct Small subunits are responsible for catalyzing peptide bonds during translation (tRNA brings on energy to create a new peptide bond).
Eukaryotic ribosomes, which are 80S complexes, consist of a small 40S and a large 60S subunit. It is the large subunit that is responsible for catalyzing peptide bonds during translation, not the small subunit. The small subunit's main role is to bind the mRNA template. Indeed, ribosome assembly begins in the nucleolus, where the necessary rRNAs and proteins are synthesized and initial assembly occurs. Subsequently, these subunits are exported to the cytoplasm where they can further mature and eventually come together to form a functional ribosome specifically during the initiation phase of translation. Incorrect statement 4 implies that the small subunit has this catalytic role, which is not the case.