The structure of chromosomes is best explained as DNA
broken apart into separate genes.
extended to form very long, thin molecules.
wrapped tightly around associated proteins.
coiled up into a ball.
DNA in chromosome wrap around the histone cores.
DNA is coiled tightly around the protein Histone.
The structure of chromosomes is best explained as DNA wrapped tightly around associated proteins. To understand this concept, let's break it down:
1. Chromosomes: Chromosomes are thread-like structures made up of DNA molecules. They carry genetic information and are located in the nucleus of our cells.
2. DNA: DNA (deoxyribonucleic acid) is a long, double-stranded molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms. It is composed of four nucleotide bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
3. Associated Proteins: Chromosomes are not just made up of DNA. They are also associated with different proteins that help maintain their structure and regulate their functions. One of the main protein complexes associated with chromosomes is called histones. DNA wraps around histones to form a structure called nucleosomes, which are like beads on a necklace.
4. Coiling and Packaging: To fit within the compact space of the nucleus, DNA coils and condenses. The DNA wraps around the histone proteins in a repetitive pattern, forming a structure known as a chromatin fiber. This condensed chromatin fiber further compacts to form the familiar X-shaped structures we commonly associate with chromosomes.
So, the correct explanation for the structure of chromosomes is that DNA is wrapped tightly around associated proteins, such as histones, to form a highly coiled and packaged structure.