Question

the nucleus has many different roles in eukaryotic cells.
check all that apply
□ calcium is stored within the nucleus.
□ assembly of ribosomal subunits occurs in the nucleus.
□ synthesis of mrna from dna occurs in the nucleus.
□ synthesis of proteins occurs within the nucleus.
□ synthesis of ribosomal rna occurs in the nucleus.

Explanation:

• Calcium is stored in the endoplasmic reticulum (specifically the sarcoplasmic reticulum in muscle cells), not the nucleus.
• Protein synthesis (translation) occurs in the cytoplasm on ribosomes, not the nucleus.
• mRNA synthesis (transcription) of DNA happens in the nucleus, as DNA is housed there.
• Ribosomal subunit assembly takes place in the nucleolus, a structure within the nucleus.
• Ribosomal RNA (rRNA) synthesis occurs in the nucleolus inside the nucleus.

Answer:

• Assembly of ribosomal subunits occurs in the nucleus.
• Synthesis of mRNA from DNA occurs in the nucleus.
• Synthesis of ribosomal RNA occurs in the nucleus.