DNA restriction is done by the following method:
**Core Concept**
DNA restriction endonucleases are enzymes that cleave DNA at specific recognition sites, and this process is crucial in genetic engineering. The underlying principle involves the use of these enzymes to cut DNA into smaller fragments. This is a key technique in molecular biology.
**Why the Correct Answer is Right**
Given the context of DNA restriction, the correct method involves the use of restriction endonucleases. These enzymes recognize specific DNA sequences and cut the DNA at these sites, resulting in fragments with defined ends. This process is fundamental for various genetic manipulations, including cloning.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not involve the use of enzymes to cleave DNA.
**Option B:** Similarly, this option is incorrect as it does not pertain to the specific recognition and cutting of DNA by restriction enzymes.
**Option C:** This option is also incorrect because it lacks the specificity of action seen with restriction endonucleases.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that restriction enzymes are named after the bacteria from which they are isolated, often with a prefix indicating the genus and species of the bacterium. This is crucial for understanding the nomenclature used in molecular biology.
**Correct Answer:** D. Restriction endonuclease digestion.