Question

Which of the following could be found in both the nucleus and the cytoplasm?

• A. Nucleolus
• B. Ribosomes
• C. RNA
• D. Both RNA & ribosomes

Answer 1

The correct option is C

RNA

The correct option is C.

Explanation of the correct option:

1. RNA is found everywhere in the cell - nucleus, nucleolus, mitochondria, chloroplasts, ribosomes, cytoplasm, etc.
2. RNAs are of three different types- mRNA, rRNA, and tRNA.
3. mRNA and tRNA are found in the cytoplasm and rRNA in the nucleus.
4. The ribosomes can be found free within the cytoplasm of a cell or attached to the endoplasmic reticulum called rough endoplasmic reticulum but do not present inside the nucleus.
5. RNA and ribosomes act together resulting in the synthesis of proteins.

Explanation of the incorrect options:

Option A:

1. The nucleolus is found inside the nucleus.
2. The main function of the nucleolus is to produce and assemble subunits that form the ribosomes.

Option B:

1. Ribosome is the site for protein synthesis.
2. Ribosomes are the most important cell organelles that are composed of RNA and protein.
3. Rough endoplasmic reticulum is a type of endoplasmic reticulum that has ribosomes that synthesize proteins.

Option D:

1. RNA and protein together form ribosomes.
2. Protein is the resulting product of ribosomes.

Final answer: RNA could be found in both the nucleus and the cytoplasm.