- molecular biology
the branch of biology that deals with the nature of biological phenomena at the molecular level through the study of DNA and RNA, proteins, and other macromolecules involved in genetic information and cell function, characteristically making use of advanced tools and techniques of separation, manipulation, imaging, and analysis. Also called new biology.[1935-40]
* * *Field of science concerned with the chemical structures and processes of biological phenomena at the molecular level.Having developed out of the related fields of biochemistry, genetics, and biophysics, the discipline is particularly concerned with the study of proteins, nucleic acids, and enzymes. In the early 1950s, growing knowledge of the structure of proteins enabled the structure of DNA to be described. The discovery in the 1970s of certain types of enzymes that can cut and recombine segments of DNA (see recombination) in the chromosomes of certain bacteria made recombinant-DNA technology possible. Molecular biologists use that technology to isolate and modify specific genes (see genetic engineering).
* * *field of science concerned with studying the chemical structures and processes of biological phenomena that involve the basic units of life, molecules. Of growing importance since the 1940s, molecular biology developed out of the related fields of biochemistry, genetics, and biophysics. The discipline is particularly concerned with the study of proteins (protein) and nucleic acids—i.e., the macromolecules that are essential to life processes. Molecular biology seeks to understand the three-dimensional structure of these macromolecules through such techniques as X-ray diffraction and electron microscopy. The discipline particularly seeks to understand the molecular basis of genetic processes; molecular biologists map the location of genes on specific chromosomes, associate these genes with particular characters of an organism, and use recombinant DNA technology to isolate, sequence, and modify specific genes.In its early period during the 1940s, the field was concerned with elucidating the basic three-dimensional structure of proteins. Growing knowledge of the structure of proteins in the early 1950s enabled the structure of deoxyribonucleic acid (DNA) (DNA)—the genetic blueprint found in all living things—to be described in 1953. Further research enabled scientists to gain an increasingly detailed knowledge not only of DNA and ribonucleic acid (RNA) but also of the chemical sequences within these substances that instruct the cells and viruses to make proteins.Molecular biology remained a pure science with few practical applications until the 1970s, when certain types of enzymes were discovered that could cut and recombine segments of DNA in the chromosomes of certain bacteria. The resulting recombinant (recombination) DNA technology became one of the most active branches of molecular biology because it allows the manipulation of the genetic sequences that determine the basic characters of organisms.
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Molecular biology — (pronounced /məˈlɛkjʊlər .../) is the branch of biology that deals with the molecular basis of biological activity. This field overlaps with other areas of biology and chemistry, particularly genetics and biochemistry. Molecular biology… … Wikipedia
molecular biology — n a branch of biology dealing with the ultimate physicochemical organization of living matter and esp. with the molecular basis of inheritance and protein synthesis * * * the study of the molecules that are associated with living organisms,… … Medical dictionary
molecular biology — n. a branch of biology that studies the chemical and physical principles associated with the composition, properties, and activities of molecules in living cells … English World dictionary
molecular biology — molecular biology. См. молекулярная биология. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) … Молекулярная биология и генетика. Толковый словарь.
molecular biology — N UNCOUNT Molecular biology is the study of the structure and function of the complex chemicals that are found in living things. Derived words: molecular biologist plural N COUNT This substance has now been cloned by molecular biologists … English dictionary
molecular biology — molekulinė biologija statusas T sritis chemija apibrėžtis Mokslas, tiriantis molekulinio lygio procesus gyvuosiuose organizmuose. atitikmenys: angl. molecular biology rus. молекулярная биология … Chemijos terminų aiškinamasis žodynas
molecular biology — noun Date: 1938 a branch of biology dealing with the ultimate physicochemical organization of living matter and especially with the molecular basis of inheritance and protein synthesis • molecular biologist noun … New Collegiate Dictionary
molecular biology — noun a) the branch of biology that studies the macromolecules of life, such as proteins, lipoproteins and nucleic acids b) the branch of biology studies the manipulation of genetic sequence of DNA See Also … Wiktionary
molecular biology — A subdivision of biology that approaches the subject of life at the level of molecular size. This applies to phenomena occurring within the cell nucleus, where the chromosomes and genes are located … Forensic science glossary
molecular biology — molec′ular biol′ogy n. gen bio the branch of biology that deals with the nature of biological phenomena at the molecular level through the study of DNA and RNA, proteins, and other macromolecules involved in genetic information and cell function… … From formal English to slang