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: -(KROH-muh-some) A structure found inside the nucleus of a cell. A chromosome is made up of proteins and DNA organized into genes. Each cell normally contains 23 pairs of chromosomes.

Detailed explanation-3: -Answer and Explanation: A single piece of the coiled DNA is known as the chromosome. The DNA is wrapped around the histones, which are protein molecules along with the non-histone proteins. The chromosomes have centromere present, which divides them into two parts.

Detailed explanation-4: -Human sperm and eggs, which have only one homologous chromosome from each pair, are said to be haploid (1n).

Detailed explanation-5: -Nucleotides are arranged in two long strands that form a spiral called a double helix. The structure of the double helix is somewhat like a ladder, with the base pairs forming the ladder’s rungs and the sugar and phosphate molecules forming the vertical sidepieces of the ladder.