Dna Essay

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Genes are made of a chemical called DNA, which is short for 'deoxyribonucleic acid'.If you took the DNA from all the cells in your body and lined it up, end to end, it would form a strand 6000 million miles long (but very, very thin)!To store this important material, DNA molecules are tightly packed around proteins called histones to make structures called chromosomes.Your genes are part of what makes you the person you are.You are different from everyone alive now and everyone who has ever lived.The DNA molecule is a double helix: that is, two long, thin strands twisted around each other like a spiral staircase. The rungs are pairs of chemicals called 'nitrogenous bases', or 'bases' for short.There are four types of base: adenine (A), thymine (T), guanine (G) and cytosine (C).(Chromosome 22 should be the smallest, but the scientists made a mistake when they first numbered them! The DNA that contains your genes is stored in your cells in a structure called the nucleus.A- DNA replication DNA replication is a biological process by which a molecule of DNA is copied.The topoisomerase helps relieve the strain by breaking and swiveling the DNA strands ahead of the replication fork.The primase synthesize a short stretch of RNA called primer, which is the initial nucleotide chain synthesize during DNA replication.

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