Question

What is the length of DNA called?

Answer 1

Hint: The length of DNA differs from organism to organism. This length is measured by various units like Armstrong, micrometer, etc. The length can also be expressed on the basis of its structural units. Here, actually, the question demands the name of the shortest piece of DNA.

Complete answer:
As we all know that cells are the basic structural and functional unit of any tissue/organ/system, just like genes are the basic units of a DNA sequence, or basically a large piece of genetic material.
A gene is defined as the specific number of polypeptide sequences that express and code for a specific protein. These genes are composed of nitrogenous bases. The number of nitrogenous bases differs from gene to gene. Like for humans, the largest gene in the dystrophin gene consists of 2.4 million bases and the TDF (Testis determining factor) gene is the smallest containing only 14 bases.
Thus, many of such genes together make up a long sequence of genetic material known as DNA.

So, the short sequences of DNA are genes and the longer sequences themselves become the DNA.

Note:
It should be kept in mind that the genetic material consisting of genes, chromosomes, and ultimately DNA- these all three are correlated with each other and ultimately resemble the same thing. The smaller genes aggregate together to form chromosomes, and the chromosomes (when they are not coiled and condensed, i.e., in a compact form as found in the mitotic phase of cell division) finally make up the genetic material- which is the DNA.