english dictionary definition meaningYesDictionary.com



a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z   







Lookup English Definition:

DNA    
macromolecule \mac`ro*mol"e*cule\, n. (Chem., Biochem.)
A very large molecule, especially a polymer having from
hundreds to many thousands of atoms, such as {DNA}, {RNA},
{protein}, {polysaccharide}, {polyethylene}, {polycarbonate},
etc.
[PJC]


deoxyribonucleic acid \deoxyribonucleic acid\ n.
a nucleic acid, usually of very high molecular weight,
consisting of a linear sequence of monomer units of
deoxyribonucleotides, occurring in most organisms in pairs of
strands, wound together in the form of a double helix; it is
the main component of chromosomes and contains the genetic
information which is the basis of heredity, transmitted from
parent to progeny, and found in all living organisms except
for certain viruses which have RNA as their basic genetic
material; -- usually referred to by the acronym {DNA}.

Syn: DNA, desoxyribonucleic acid.
[PJC]

Note: The monomer units making up the DNA each contain one of
four heterocyclic bases: thymine, adenine, cytosine, or
guanine. The genetic information is contained in the
precise sequence of these monomer units, which
ultimately specify the sequence of proteins to be made
by the organism's biosynthetic processes, mediated
through the synthesis of RNA having a base sequence
corresponding to that of the DNA. The DNA sequence also
specifies the sequence of the various RNA molecules the
RNA base sequence being a copy of that on one of the
DNA strands. Most of the RNA synthesized is involved in
protein synthesis. In the double-helical form of DNA,
the thymine on one strand is paired with the adenine on
the opposite strand, and cytosine of one strand is
paired with guanine on the opposite strand. There is in
DNA also certain controlling information concerning the
timing and amount of RNA to be made, encoded within the
sequence of the DNA in ways that are still being
elucidated.
When this structure is replicated in the course of cell
multiplication, two identical double-helical molecules
are formed, each containing one strand from the
original molecule. Each resulting molecule is
distributred to either the parent or progeny organism,
and this is the basic mechanism for transmission of
hereditary information. In RNA-based viruses, or those
having single strands of DNA (as certain viruses), the
genetic information transmission occurs through a
double-stranded intermediate by a similar mechanism.
In some organisms slight modifications of the bases of
DNA are found, such as methylcytosine or, in some
viruses, uracil or hydroxymethyluracil; these unusual
bases act analogously to the normal bases in their
genetic coding function. A small percentage of
methylcytosine is found in many organisms, and it
serves in some cases as a special signal, as for
restriction enzymes.
[PJC]


DNA \DNA\ (d[=e]"[e^]n*[=a]`) n. (Biochemistry, Genetics)
abbreviation for {deoxyribonucleic acid}; -- more commonly
used than the full name. See also {RNA}. [acronym]

Syn: deoxyribonucleic acid, desoxyribonucleic acid,
deoxyribosenucleic acid.
[PJC]

DNA
n 1: (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" [synonym:
{deoxyribonucleic acid}, {desoxyribonucleic acid}, {DNA}]

60 Moby Thesaurus words for "DNA":
Altmann theory, DNA double helix, De Vries theory,
Galtonian theory, Mendelianism, Mendelism, RNA, Verworn theory,
Weismann theory, Weismannism, Wiesner theory, allele, allelomorph,
anticodon, biotype, birth, character, chromatid, chromatin,
chromosome, codon, deoxyribonucleic acid, determinant, determiner,
diathesis, endowment, eugenics, factor, gene, gene complex,
gene flow, gene pool, genesiology, genetic code, genetic drift,
genetics, genotype, hereditability, hereditary character, heredity,
heritability, heritage, inborn capacity, inheritability,
inheritance, mRNA, matrocliny, messenger RNA, nucleotide,
operator gene, operon, patrocliny, pharmacogenetics,
recessive character, regulator gene, replication, ribosomal RNA,
structural gene, tRNA, transfer RNA




install english dictionary definition & meaning lookup widget!


english dictionary definition meaning工具:
Select Color:

































































english dictionary meaning information:
  • RECOMMEND | meaning in the Cambridge English Dictionary
    recommend definition: 1 to suggest that someone or something would be good or suitable for a particular job or purpose, or to suggest that a particular action should be done: 2 to suggest that someone or something would be good or suitable for a particular job or purpose, or to suggest that a… Learn more
  • HOLD | meaning in the Cambridge English Dictionary
    hold definition: 1 to take and keep something in your hand or arms: 2 to support something: 3 to press your nose tightly between thumb and finger in order to close it: Learn more
  • Dictionary. com | Meanings and Definitions of Words at . . .
    Dictionary com is the world’s leading online source for English definitions, synonyms, word origins and etymologies, audio pronunciations, example sentences, slang phrases, idioms, word games, legal and medical terms, Word of the Day and more For over 20 years, Dictionary com has been helping millions of people improve their use of the English language with its free digital services
  • Paleontology | Definition of Paleontology by Merriam-Webster
    Paleontology definition is - a science dealing with the life of past geological periods as known from fossil remains How to use paleontology in a sentence Did You Know?
  • Interpretation legal definition of . . . - Legal Dictionary
    See also: answer, clarification, comment, connotation, construction, content, definition, diagnosis, explanation, meaning, paraphrase, rendition, signification, solution INTERPRETATION The explication of a law, agreement, will, or other instrument, which appears obscure or ambiguous 2 The object of interpretation is to find out or collect the intention of the maker of the instrument, either
  • B. i. d | definition of b. i. d by Medical dictionary
    Disclaimer All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only
  • Substance - definition of substance by The Free Dictionary
    sub·stance (sŭb′stəns) n 1 a That which has mass and occupies space; matter b A material of a particular kind or constitution c A drug, chemical, or other material (such as glue) that one is dependent on or uses habitually and that is often illegal or subject to government regulation: Which substance was he abusing? 2 The most important
  • Mosaic | Definition of Mosaic by Merriam-Webster
    Mosaic definition is - a surface decoration made by inlaying small pieces of variously colored material to form pictures or patterns; also : the process of making it How to use mosaic in a sentence
  • Vaccination | definition of vaccination by Medical dictionary
    Vaccination Definition Vaccination is the use of vaccines to prevent specific diseases Purpose Many diseases that once caused widespread illness, disability, and death now can be prevented through the use of vaccines Vaccines are medicines that contain weakened or dead bacteria or viruses When a person takes a vaccine, his or her immune system
  • Atom - definition of atom by The Free Dictionary
    at·om (ăt′əm) n 1 a A part or particle considered to be an irreducible constituent of a specified system b The irreducible, indestructible material unit postulated by ancient atomism 2 An extremely small part, quantity, or amount 3 Physics Chemistry a The smallest unit of an element, having all the characteristics of that element and





English Dictionary  2005-2009

|dictionary |Business Directories,Company Directories |ZIP Code,Postal Code