Both DNA and RNA are present in:
**Core Concept:**
The question tests our understanding of the cellular components involved in genetic information storage and processing. Both DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid) are essential for the transmission of genetic information in cells. DNA is found in the nucleus, while RNA is found both in the nucleus and cytoplasm.
**Why the Correct Answer is Right:**
DNA is primarily located in the nucleus of eukaryotic cells, where it stores the genetic information in the form of genes. On the other hand, RNA is found both in the nucleus and cytoplasm. In the nucleus, RNA plays a role in transcription, which is the process of converting DNA's genetic code into RNA. In the cytoplasm, RNA functions in translation, where it acts as a template to synthesize proteins.
**Why Each Wrong Option is Incorrect:**
A. While DNA is indeed present in prokaryotic cells (bacteria and archaea), it is not present in the mitochondria and chloroplasts of eukaryotic cells. This option is incorrect because it does not account for the presence of RNA in these organelles.
B. While RNA is present in the cytoplasm, this option does not address the location of DNA, which is primarily found in the nucleus.
C. The presence of RNA in the nucleus is correct, but this option does not consider the location of DNA. DNA is not found in the mitochondria and chloroplasts, unlike eukaryotic cells where DNA is primarily located in the nucleus.
D. This option incorrectly states that DNA is present in the mitochondria and chloroplasts of eukaryotic cells. In reality, DNA is located in the nucleus of eukaryotic cells, while RNA is found in the mitochondria and chloroplasts during protein synthesis.
**Clinical Pearl:**
The correct answer (C) highlights the unique features of eukaryotic cells, where DNA is stored in the nucleus, and RNA is synthesized and processed in the nucleus and transported to various cellular locations for its functions. This distinction is essential to understand the cellular processes involving genetic information storage and processing.