In short, DNA is a complex molecule that consists of many components, a portion of which are passed from parent organisms to their offspring during the process of reproduction.
http://www.nature.com/scitable/topicpage/DNA-Is-a-Structure-That-Encodes-Biological-6493050
This contains all of our genes. DNA, itself is made up of four chemical bases, pairs of which form the rungs of the twisted, ladder-shaped DNA molecules. These four molecules are adenine (A), thymine (T), cytosine (C), and guanine (G). All genes are made up of stretches of these four bases (arranged in different ways and in different lengths). Photo: National Institute of Health. A critical feature of DNA is the ability of the nucleotides to make specific pairs: .
http://www.edinformatics.com/math_science/human_genome.htm
Transcription is carried out by a DNA-dependent RNA polymerase that copies the sequence of a DNA strand into RNA. To begin transcribing a gene, the RNA polymerase binds to a sequence of DNA called a promoter and separates the DNA strands.
https://en.wikipedia.org/wiki/DNA
Figure 1: A single nucleotide contains a nitrogenous base (red), a deoxyribose sugar molecule (gray), and a phosphate group attached to the 5' side of the sugar (indicated by light gray). Opposite to the 5' side of the sugar molecule is the 3' side (dark gray), which has a free hydroxyl group attached (not shown).
http://www.nature.com/scitable/topicpage/DNA-Is-a-Structure-That-Encodes-Biological-6493050
There are four different DNA nucleotides, each defined by a specific nitrogenous base: adenine (often abbreviated A in science writing), thymine (abbreviated T), guanine (abbreviated G), and cytosine (abbreviated C) (Figure 2).
http://www.nature.com/scitable/topicpage/DNA-Is-a-Structure-That-Encodes-Biological-6493050
Deoxyribonucleic acid (/diˌɒksiˌraɪbɵ.njuːˌkleɪ.ɨk ˈaesɪd/ ; ˈæSɪD) dna is a molecule that carries most of the genetic instructions used in the, development functioning and reproduction of all known living organisms and many. viruses
https://en.wikipedia.org/wiki/DNA
There are four nucleotides that make up DNA: Adenine, Thymine, Guanine and Cytosine. There are billions of them that make up one strand of DNA. Adenine always pairs with Thymi … ne and Guanine always pairs with Cytosine. Also, in the Rna during DNA transcription, Uracil replaces Thymine and pairs with Adenine instead. Adenine (A) Thymine (T) Guanine (G) Cytosine (C).
http://www.answers.com/Q/How_many_genes_make_up_the_human_DNA
This base-to-base bonding is not random; rather, each A in one strand always pairs with a T in the other strand, and each C always pairs with a G. The double-stranded DNA that results from this pattern of bonding looks much like a ladder with sugar-phosphate side supports and base-pair rungs.
http://www.nature.com/scitable/topicpage/DNA-Is-a-Structure-That-Encodes-Biological-6493050
The human genome of Homo sapiens is stored on 23 chromosome pairs. 22 of these are autosomal chromosome pairs, while the remaining pair is sex-determining. The haploid human genome occupies a total of just over 3 billion DNA base pairs that means 6 billion base pairs per diploid cell.
http://www.edinformatics.com/math_science/human_genome.htm
Figure 9: Supercoiled eukaryotic DNA. Figure 10: This karyotype depicts all 23 pairs of chromosomes in a human cell, including the sex-determining X and Y chromosomes that together make up the twenty-third set (lower right).
http://www.nature.com/scitable/topicpage/DNA-Is-a-Structure-That-Encodes-Biological-6493050
how many genes make up our dna strand
23 chromosome pairs of genes make up our DNA strand.