DNA Structure - Biology Dictionary
2021年1月21日 · DNA molecules consist of two DNA strands, which are twisted around one another to form a spiral shape known as the double helix. The double helix structure of DNA was first discovered in 1953 by James Watson, Francis Crick, and Rosalind Franklin.
DNA Structure and Shape - Ask A Biologist
2010年4月24日 · A closer look at the chemical structure of DNA shows four main building blocks. We call these nitrogenous bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). DNA also includes sugars and phosphate groups (made of phosphorus and oxygen). These make the phosphate-deoxyribose backbone.
9.1: The Structure of DNA - Biology LibreTexts
2022年3月17日 · The model of the double-helix structure of DNA was proposed by Watson and Crick. The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.
DNA | Definition, Discovery, Function, Bases, Facts, & Structure ...
2024年10月23日 · Each strand of a DNA molecule is composed of a long chain of monomer nucleotides. The nucleotides of DNA consist of a deoxyribose sugar molecule to which is attached a phosphate group and one of four nitrogenous bases: two purines (adenine and guanine) and two pyrimidines (cytosine and thymine).
The Structure and Function of DNA - Molecular Biology of the …
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).
DNA Is a Structure That Encodes Biological Information
In short, DNA is a complex molecule that consists of many components, a portion of which are passed from parent organisms to their offspring during the process of reproduction.
9.1 The Structure of DNA - Concepts of Biology - OpenStax
At the most basic level, DNA is wrapped around proteins known as histones to form structures called nucleosomes. The DNA is wrapped tightly around the histone core. This nucleosome is linked to the next one by a short strand of DNA that is free of histones.
Biochemistry, DNA Structure - StatPearls - NCBI Bookshelf
2023年6月12日 · The three-dimensional shape of a DNA molecule, or its tertiary structure, is a right-handed double helix (Figure 2b). The hydrogen-bonded bases on each strand are stacked in parallel and run perpendicular to the sugar-phosphate backbone.
Zooming in on DNA Structure - Visible Body
DNA is a macromolecule consisting of two strands that twist around a common axis in a shape called a double helix. The double helix looks like a twisted ladder—the rungs of the ladder are composed of pairs of nitrogenous bases (base pairs), and the sides of the ladder are made up of alternating sugar molecules and phosphate groups.
DNA structure - Structure of DNA - Higher Biology Revision - BBC
DNA is the molecule that holds the instructions for growth and development in every living thing. Its structure is described as a double-stranded helix held together by complementary base...