Which is true about the DNA molecule 1.it is used as a way to defend against intense radiation 2.it is an incredibly long molecule with thousands of genes 3.it is made of many small parts that are separated by protein
The true statement about the DNA molecule is:
2. It is an incredibly long molecule with thousands of genes.
To understand why this statement is true, let's break it down:
DNA is short for deoxyribonucleic acid, and it is a molecule found in the cells of all living organisms. It carries the genetic instructions that determine the development and functioning of an organism.
DNA is indeed incredibly long. In humans, for example, the DNA molecule in each cell nucleus stretches out to about 6 feet (2 meters) when unraveled. However, it is tightly packed and coiled into a structure called chromatin, which allows it to fit inside the tiny nucleus of a cell.
The DNA molecule consists of sequences of nucleotides, which are the building blocks of DNA. Each nucleotide is made up of three components: a sugar molecule (deoxyribose), a phosphate group, and one of four nitrogenous bases (adenine (A), cytosine (C), guanine (G), or thymine (T)).
Genes are specific segments of the DNA molecule that contain the instructions for making proteins. Each gene carries the information required to produce a particular protein, which plays a vital role in various cellular processes and functions.
So, DNA is indeed an incredibly long molecule that contains thousands of genes, and these genes carry the instructions to produce various proteins necessary for an organism's development and functioning.