Αποτελέσματα Αναζήτησης
24 Σεπ 2018 · To understand the structure and chemistry of DNA and the significance of the double helix. Objectives. After this chapter, you should be able to. explain the structural basis for the directionality of polynucleotide chains. describe how hydrogen bonding and geometry dictate base pairing. describe the forces that stabilize the DNA double helix.
A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits. Each of these chains is known as a DNA chain, or a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together (Figure 4-3).
how the structure of DNA, with its base-paired strands, (1) holds the genetic information that determines how organisms are built, and (2) is accurately copied to make it possible for genetic information to be inherited when cells
21 Απρ 2015 · The information encoded by DNA is both digital - the precise base specifying, for example, aminoacid sequences - and analogue. The latter determines the sequence-dependent physicochemical...
5 Ιαν 2000 · actual structure of DNA depends strongly on the sequence. The positions of the phosphate groups, the positions of the amino and keto groups in DNA reflect the sequence in a predictable way. Current research is aimed at understanding this structural code and to determine if regulatory sequence-specific DNA binding
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.
Introduction. Cell-Chromosome-DNA. What’s So Special About DNA? DNA is one of the most boring macromolecules imaginable - its made of only four building blocks and has a perfectly monotonous structure. Worse yet, DNA just sits there - it doesn’t catalyze reactions or build the cell or organism. So, what’s. so. good. about. DNA?
