what is dna ?chromosome?
is it like inside the chromosomes dna is present and a part of the strand of the dna is called a gene?
if there are 46 chromosomes in the body and inside every chromosome one dna is present so then will there be 46 dna in our body?

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Solution

DNA stands for Deoxyribonucleic acid. DNA is a hereditary unit of the cell which contains information for development and functioning of the organism.

A chromosome is a compact structure of DNA and protein found inside a cell. It contains may genes.

Genes are the part of a chromosome, and made up of DNA. It controls the appearance of a set of hereditary characteristics.

A single chromosome consists of a single, continous strand of double helix DNA i.e each chromosome consists of linear double stranded DNA molecule, so 46 chromosomes means 46 strands of double helix DNA in a cell.

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Correct the following statements if there is any mistake.

(a) The four nitrogenous bases in the DNA are Guanine, Thiamine, Adrenaline and Cytosine.

(b) Genes are specific sequences of bases on a chromosome.

(d) Nucleosomes are groups of cysteine molecules surrounded by DNA strands.

(e) If there are 46 chromosomes in a cell, there will be 23 chromatin fibres inside the nucleus during interphase.

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