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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 encodes information through the order, or sequence, of the nucleotides along each strand. Each base—A, C, T, or G—can be considered as a letter in a four-letter alphabet that spells out biological messages in the chemical structure of the DNA.
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.
5 Ιαν 2000 · The Structural Conformations of DNA 1. The principle message of this lecture is that the structure of DNA is much more flexible than previously conceived. DNA is a highly flexible molecule that can undergo a series of transformations leading to many conformations with different biological functions. 2. The structure of DNA as originally proposed by
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.
