The larger sub- unit of a ribosome is found to contain 28S , 5,8S and 5S types RNA. This ribosome is found in

Options

A. Bacterium
B. Mitochondrion
C. Animal cell
D. Chloroplast

Answer

To determine where the larger subunit of a ribosome containing 28S, 5.8S, and 5S types of RNA is found, we can follow these steps:

### Step 1: Understand Ribosome Composition
Ribosomes are made up of two subunits: a larger subunit and a smaller subunit. In eukaryotic cells, ribosomes are classified as 80S, while in prokaryotic cells, they are classified as 70S.

**Hint:** Remember that the 'S' value indicates the sedimentation rate during centrifugation, which correlates with size and density.

### Step 2: Identify the Components of the Larger Subunit
In eukaryotic cells, the larger subunit (60S) contains:
- 28S rRNA
- 5.8S rRNA
- 5S rRNA

This composition is characteristic of the ribosomes found in eukaryotic organisms.

**Hint:** Look for the specific types of rRNA that are present in the larger subunit to help identify the type of ribosome.

### Step 3: Compare with Prokaryotic Ribosomes
In prokaryotic cells (like bacteria), the ribosome is classified as 70S, with the larger subunit being 50S. This subunit contains different rRNA types, which do not include 28S, 5.8S, and 5S.

**Hint:** Prokaryotic ribosomes have a different composition than eukaryotic ribosomes, which can help narrow down the options.

### Step 4: Consider Mitochondria and Chloroplasts
Mitochondria and chloroplasts also contain ribosomes that resemble prokaryotic ribosomes (70S) due to their evolutionary origins. Therefore, they would not contain the 28S, 5.8S, and 5S types of RNA in their larger subunit.

**Hint:** Recall that mitochondria and chloroplasts are derived from prokaryotic ancestors, which influences their ribosomal structure.

### Step 5: Conclusion
Given that the larger subunit with 28S, 5.8S, and 5S rRNA is characteristic of eukaryotic ribosomes, the correct answer is that this ribosome is found in **animal cells**.

**Final Answer:** The ribosome with the larger subunit containing 28S, 5.8S, and 5S types of RNA is found in **animal cells**.