NEET BIOLOGY

Detailed explanation-1: -In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

Detailed explanation-2: -Our cells contain many structures that are essential for living. One of these key structures is a chromosome. Chromosomes are found in the nucleus of every cell of our body and are made up of DNA, tightly coiled around proteins.

Detailed explanation-3: -Most DNA is found inside the nucleus of a cell, where it forms the chromosomes. Chromosomes have proteins called histones that bind to DNA. DNA has two strands that twist into the shape of a spiral ladder called a helix.

Detailed explanation-4: -Examples of organelles are the nucleus (a structure that contains the cell’s chromosomes and is where RNA is made), mitochondria (structures that make energy for the cell), and lysosomes (sac-like containers filled with enzymes that digest and help recycle molecules in the cell).

Detailed explanation-5: -Answer and Explanation: The part of the cell that contains DNA is the nucleus in eukaryotic cells, or the nucleoid region in prokaryotic cells. Eukaryotic cells include plants, animals and fungi and all eukaryotic cells have a nucleus and membrane bound organelles.