The building block of all lifeforms on earth is the deoxyribonucleic acid ( dna ) . it has the shape of a double helix in which two polynucleotide chains are coiled about each other in a spiral 而组成地球上所有生命的基本单位去氧核糖核酸( dna )的双螺旋结构也是非对称地存在的,原来自然界中的去氧核糖核酸绝大部分都是右旋的。
Dna , or deoxyribonucleic acid , is the substance ? specifically , a nucleic acid molecule with a twisted double strand double helix form ? that carries the genetic information for humans and other living organisms from one generation to the next Dna即脱氧核糖核酸,是一种双螺旋链核酸分子,它携带人类及其他生物的遗传信息,使其代代相传。
Since 1953 , when biochemists james watson and francis crick identified the structure of deoxyribonucleic acid ( dna , the genetic basis of all living organisms ) , the scientific understanding of biological and genetic processes has accelerated dramatically 自从1953年生化学家詹姆斯华生和弗兰西斯克里克发现了dna (所有生物体的遗传基础)结构,人们对生物和遗传过程的科学理解有了快速的发展。
(biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information; "DNA is the king of molecules" 同义词:desoxyribonucleic acid, DNA,