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24 Σεπ 2018 · we look closely at the structure and chemistry of DNA in order to learn how its double-helical architecture allows information to be stored, duplicated, and accessed.
21 Απρ 2015 · The proposal of a double-helical structure for DNA over 60 years ago provided an eminently satisfying explanation for the heritability of genetic information. But why is DNA, and not RNA, now...
DNA structure. DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code.
The structure of DNA A. Important features of the DNA structure: 1. Right-handed double helix 2. The helices are antiparallel 3. Each helix has a series of nucleotides held together with phosphodiester bonds between the OH groups in two adjacent sugar residues. 4.
Describe the structure of a molecule of RNA. Describe the three kinds of RNA and construct a pictorial representation. Summarize the physiology of DNA in terms of replication and protein synthesis. List the sequence of events in DNA replication and explain why it is referred to as semiconservative. Evaluate the process of transcription.
Overview. Deoxyribonucleic acid (DNA) stores information for the synthesis of specific proteins. DNA has deoxyribose as its sugar. DNA consists of a phosphate group, a sugar, and a nitrogenous base. The structure of DNA is a helical, double-stranded macromolecule with bases projecting into the interior of the molecule.
The basic structure of DNA provides insight into its function. The main features of its structure are that it can reliably: (1) reproduce exact copies of this information to pass on to descendant cells, and (2) use the information to create proteins that produce and regulate the biochemistry of the cell.
