The diagram below represents a portion of a dna molecule
- The diagram below represents a portion of a dna molecule
- The genetic code of a dna molecule is determined by a specific sequence of
- Four different segments of a dna molecule are represented below.
- A portion of a molecule is shown in the diagram below
- The diagram below represents an incomplete section of a dna molecule
- A dna nucleotide may contain
The genetic code of a dna molecule is determined by a specific sequence of
DNA is found in the nucleus in the form of chromosomes, which multiply during mitosis to ensure that daughter cells have the same amount of DNA as the mother cell. But, first and foremost, what is DNA and what does it do? The structure of DNA and how it codes for the production of proteins by cells will be discussed in this topic. We’ll learn how these proteins go on to perform a variety of important functions in cells in the next topic.
Deoxyribonucleic Acid is the abbreviation for Deoxyribonucleic Acid. It’s a chemical molecule that’s present in all cells and is made up of long chains of repeating components. Three structures make up the repeating unit that makes up a DNA molecule. Two of these are always the same, but the base can take four different forms. As a result, a short segment of a DNA molecule may be depicted in the diagram below.
The DNA molecule is made up of a long chain of repeating units bound to a series of bases, as seen in the diagram. A, T, C, and G are the four potential bases in a DNA molecule. Although the diagram only depicts a small portion of DNA, one chromosome would be millions of bases long. The sequence of these bases is critical for the cell’s functions, and thus for life itself, as we’ll see later.
Four different segments of a dna molecule are represented below.
Adenine (A), cytosine (C), guanine (G), and thymine (T) are the four forms of bases present in a DNA molecule (T). A DNA molecule is made up of two strands that are wrapped around each other and held together by base bonds. Adenine and thymine form a pair, while cytosine and guanine form a pair. A gene is a sequence of bases in a portion of a DNA molecule that contains the instructions for assembling a protein.
The four bases of DNA—the A, C, G, and Ts—are strung together in such a way that the cellular machinery, the ribosome, can read them and transform them into a protein is known as genetic code. In the genetic code, each three nucleotides in a row count as a triplet and code for a single amino acid. As a result, each three-letter sequence represents an amino acid. And since proteins are made up of hundreds of amino acids, the code that creates one protein could contain hundreds, if not thousands, of triplets.
A portion of a molecule is shown in the diagram below
Earlier studies had shown that DNA is composed of building blocks called nucleotides consisting of a deoxyribose sugar, a phosphate group, and one of four nitrogen bases — adenine (A), thymine (T), guanine (G), and cytosine (C) (C). Phosphates and sugars from neighboring nucleotides bind together to form a long polymer. Other important experiments revealed that the A-to-T and G-to-C ratios are constant in all living organisms. X-ray crystallography gave the final hint that the DNA molecule is a double helix, shaped like a twisted ladder.
James Watson and Francis Crick of the Cavendish Laboratory in Cambridge, England, won the race to figure out how these components fit together in a three-dimensional structure in 1953. They demonstrated that the twisted uprights of the DNA ladder are formed by alternating deoxyribose and phosphate molecules. The ladder’s rungs are made up of compatible pairs of nitrogen bases: A always goes with T, and G always goes with C.
The diagram below represents an incomplete section of a dna molecule
The genetic code and genetic knowledge
A dna nucleotide may contain
The order of amino acids in a protein molecule can be determined by the sequence of bases in a DNA molecule. Different amino acids are represented by triplets, which are groups of three bases. The genetic code is built on this foundation. A gene is a DNA sequence of bases (genetic information) that codes for a protein. RNA with a messenger feature (mRNA) The instructions for making proteins and the structures where proteins are produced are present in two different places in animal, plant, and fungal cells. Proteins are formed in the cytoplasm from free amino acids in structures called ribosomes, while DNA is contained in the nucleus. In the nucleus, a chemical called messenger RNA (mRNA) is produced, which transports a copy of a gene’s DNA base sequence to the cytoplasm. The instructions carried by mRNA are used by ribosomes to assemble amino acids in the correct order to produce a particular protein.