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30 Δεκ 2022 · DNA normally exists as a two antiparallel complementary strands held together by hydrogen bonds between adenines (A) and thymines (T), and between guanines (G) and cytosines (C). DNA is normally found as a double-stranded molecule in the cell whereas RNA is mostly single-stranded.
- 9.1: The Structure
DNA is a working molecule; it must be replicated when a cell...
- 9.1: The Structure
17 Μαρ 2022 · DNA is a working molecule; it must be replicated when a cell is ready to divide, and it must be “read” to produce the molecules, such as proteins, to carry out the functions of the cell. For this reason, the DNA is protected and packaged in very specific ways.
13 Σεπ 2023 · The two strands run in opposite directions, known as antiparallel orientation. One strand has a 5’ end with a free phosphate group and a 3’ end with a free hydroxyl group (-OH). The other strand is oriented in the opposite direction having its 5’ end facing the 3’ end of the first strand and vice versa.
DNA is made of four types of nucleotides, which are linked covalently into a polynucleotide chain (a DNA strand) with a sugar-phosphate backbone from which the bases (A, C, G, and T) extend. A DNA molecule is composed of two (more...)
Opposite the 5' carbon, on the other side of the deoxyribose ring, is the 3' carbon, which is not attached to a phosphate group. This portion of the nucleotide is typically referred to as the 3'...
21 Απρ 2024 · Watson and Crick proposed that DNA is made up of two strands that are twisted around each other to form a right-handed helix. The two DNA strands are antiparallel, such that the 3ʹ end of one strand faces the 5ʹ end of the other (Figure \(\PageIndex{6}\)).
What did the duo actually discover? Aa Aa Aa. Many people believe that American biologist James Watson and English physicist Francis Crick discovered DNA in the 1950s. In reality, this is not...
