Nohern blotting used in separation and diagnosis of:
**Core Concept**
Northern blotting is a laboratory technique used for the detection and quantification of specific RNA molecules in a sample. It involves separating RNA molecules by size using electrophoresis, transferring them to a membrane, and then hybridizing them with a labeled probe to detect the presence of a specific RNA sequence.
**Why the Correct Answer is Right**
Northern blotting is a molecular biology technique that allows researchers to analyze and compare the expression levels of specific genes in different samples. The process involves the following steps: RNA extraction, electrophoresis, transfer to a membrane, and hybridization with a labeled probe. The labeled probe is designed to specifically bind to the RNA of interest, allowing for the detection and quantification of the target RNA.
**Why Each Wrong Option is Incorrect**
**Option A:** DNA blotting is actually known as Southern blotting, which is a technique used to detect specific DNA sequences in a sample.
**Option B:** Western blotting is a technique used to detect specific proteins in a sample, not RNA.
**Option C:** Microarray analysis is a technique used to analyze the expression levels of thousands of genes simultaneously, but it is not a blotting technique like Northern blotting.
**Clinical Pearl / High-Yield Fact**
Northern blotting is a useful technique for understanding the expression patterns of specific genes in different tissues or conditions, which can provide valuable insights into the underlying biology of a disease.
**Correct Answer:** D. RNA.