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Deoxyribonucleic Acid

Check us out at www.tutorvista.com Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms and some viruses. The main role of DNA molecules is the long-term storage of information. DNA is often compared to a set of blueprints or a recipe, or a code, since it contains the instructions needed to construct other components of cells, such as proteins and RNA molecules. The DNA segments that carry this genetic information are called genes, but other DNA sequences have structural purposes, or are involved in regulating the use of this genetic information. Chemically, DNA consists of two long polymers of simple units called nucleotides, with backbones made of sugars and phosphate groups joined by ester bonds. These two strands run in opposite directions to each other and are therefore anti-parallel. Attached to each sugar is one of four types of molecules called bases. It is the sequence of these four bases along the backbone that encodes information. This information is read using the genetic code, which specifies the sequence of the amino acids within proteins. The code is read by copying stretches of DNA into the related nucleic acid RNA, in a process called transcription. Within cells, DNA is organized into long structures called chromosomes. These chromosomes are duplicated before cells divide, in a process called DNA replication. Eukaryotic organisms (animals, plants, fungi ...
Категория: Education
Время: 00:02:32.250
Теги: Deoxyribonucleic Acid
 

CELL wrapping & DNA replication

Molecular Biology This movie show the cell wrapping and DNA replication filmed or computermade. Biologia molecular: Esse filme mostra a divisão celular filmada ea replicação do DNA por computação gráfica.
Категория: Howto & Style
Время: 00:02:19.500
Теги: Biology cell dna molecular
 

DNA Structure and Replication: CrashCourse Biology #10

Hank introduces us to that wondrous molecule deoxyribonucleic acid - also known as DNA - and explains how it replicates itself in our cells. Like CrashCourse on Facebook: www.facebook.com Follow CrashCourse on Twitter: www.twitter.com References for this episode can be found in the Google document here: dft.ba 1:41 link to Biological Molecules www.youtube.com Table of Contents: 1) Nucleic Acids 1:30 2) DNA -A) Polymers 1:53 -B) Three Ingredients 2:12 -C) Base Pairs 3:45 -D) Base Sequences 4:13 3) Pop Quiz 5:07 4) RNA 5:36 -A) Three Differences from DNA 5:43 5) Biolography 6:16 6) Replication 8:49 -A) Helicase and Unzipping 9:22 -B) Leading Strand 9:38 -C) DNA Polymerase 10:08 -D) RNA Primase 10:24 -E) Lagging Strand 10:46 -F) Okazaki Fragments 11:07 -F) DNA Ligase 11:47 DNA, deoxyribonucleic acid, chromosome, nucleic acid, ribonucleic acid, RNA, polymer, nucleotide, double helix, nucleotide base, base pair, base sequence, friedrich miescher, rosalind franklin, replication, helicase, leading strand, lagging strand, rna primase, dna polymerase, okazaki fragment
Категория: Education
Время: 00:09:44.250
Теги: DNA deoxyribonucleic acid chromosome nucleic acid ribonucleic acid RNA polymer nucleotide double helix nucleotide base base pair base sequence friedrich miescher rosalind franklin replication helicase leading strand lagging strand rna primase dna polymerase okazaki fragment
 

Blackfield - DNA

Категория: Music
Время: 00:02:58.500
Теги: DNA blackfield welcome to my DNA double helix deoxyribonucleic acid steven wilson aviv geffen
 

Nucleic Acids - DNA / ADN

ADN / DNA DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person's body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA). The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people. The order, or sequence, of these bases determines the information available for building and maintaining an organism, similar to the way in which letters of the alphabet appear in a certain order to form words and sentences. DNA bases pair up with each other, A with T and C with G, to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule. Together, a base, sugar, and phosphate are called a nucleotide. Nucleotides are arranged in two long strands that form a spiral called a double helix. The structure of the double helix is somewhat like a ladder, with the base pairs forming the ladder's rungs and the sugar and phosphate molecules forming the vertical sidepieces of the ladder. An important property of DNA is that it can replicate, or make copies of itself. Each strand of DNA in the double helix can serve as a pattern for duplicating the ...
Категория: Education
Время: 00:00:36
Теги: Bioquimica Biochemistry health medicine biology phisiology human body
 

DNA Structure

"Two DNA strands intertwine to form a double helix. Each strand has a backbone composed of phosphates and sugars to which the bases are attached. The bases form the core of the double helix, while the sugar/phosphate backbones are on the outside. The two grooves between the backbones are called the major and minor groove based on their sizes. Most proteinDNA contacts are made in the major grove, because the minor groove is too narrow. The DNA backbone is assembled from repeating deoxyribose sugar units that are linked through phosphate groups. Each phosphate carries a negative charge, making the entire DNA backbone highly charged and polar. A cyclic base is attached to each sugar. The bases are planar and extend out perpendicular to the path of the backbone. Pyrimidine bases are composed of one ring and purine bases of two rings. Adjacent bases are aligned so that their planar rings stack on top of one another. Base stacking contributes significantly to the stability of the double helix. In a double helix, each base on one strand is paired to a base on the other strand that lies in the same plane. In these base pairing interactions, guanine always pairs with cytosine, and thymine with adenine. A GC pair is stabilized by three hydrogen bonds formed between amino and carbonyl groups that project from the bases. In contrast, an AT pair is stabilized by two hydrogen bonds. The specificity of base pairing—that is, C always pairing with G, and A always pairing with T—ensures ...
Категория: Science & Technology
Время: 00:02:20.250
Теги: DNA deoxyribonucleic acid sugar phospahte backbone base adenine thymine guanine cytosine major minor groove negative charge polar pyrimidine purine stacking double helix hydrogen bond h-bond phosphodiester complementary strand replication transcription cell biology biochemistry science
 

DNA

An introduction to DNA
Категория: Education
Время: 00:21:03.750
Теги: biology dna genetics
 

Deoxyribonucleic acid

Ian saying some big words
Категория: People & Blogs
Время: 00:01:04.500
Теги: dna robin carbon dioxide proboscis
 

The Faundations of Deoxyribonucleic Acid (DNA)

Science rules
Категория: Film & Animation
Время: 00:06:06.750
Теги: DNA project matias emily
 

extracting my own DNA at home

i managed to extract my DNA with household equipment - and then i put it under the microscope for a closer look. :-) unlike most of my other experiments, this one is completely safe and easy to repeat at home for everybody!
Категория: Science & Technology
Время: 00:07:18
Теги: DS DNA DNS extraction extrahieren at home deoxyribonucleic acid desoxyribonukleinsäure cell nucleus programming genetic code gen genetischer genotype gene genes human body protein architecture what we're made of our life live science biology inside koerper menschlicher medicine medical hospital blood analysis
 
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