Question

multiple-choice question
the nucleus of a cell contains
□ rough er
□ ribosomes
□ cytoplasm
□ dna

Explanation:

To solve this, we analyze each option:

• Rough ER (endoplasmic reticulum) is part of the cytoplasm, not the nucleus.
• Ribosomes are either free in the cytoplasm or attached to rough ER, not in the nucleus.
• Cytoplasm is the fluid outside the nucleus (in eukaryotes) or the region within the cell membrane (in prokaryotes), not in the nucleus.
• DNA is the genetic material, and in eukaryotic cells, most of the DNA is located in the nucleus (organized as chromosomes). Prokaryotic cells have a nucleoid region with DNA, but the question refers to the nucleus (implying a eukaryotic context), so DNA is in the nucleus.

Answer:

D. DNA (assuming the options are labeled A: rough ER, B: ribosomes, C: cytoplasm, D: DNA; if labels differ, the correct option is the one with "DNA")