DNA is composed of repeating units of
Correct option is D
What are the nucleic acids?
A nucleotide is the fundamental element of nucleic acids. DNA and RNA are polymers made up of nucleotides in long chains. Nucleotides are sugar molecules (either the ribose found in RNA or deoxyribose for DNA) connected to a phosphate group and a nitrogen-containing molecule. The bases that are used in DNA are Adenine (A) and Cytosine (C), and the guanine (G) and Thymine (T). In RNA, the base Uracil (U) is used in place of thymine.
Nucleotides
Nucleotides are the chemical compounds strung together to make nucleic acid, including DNA and RNA. Both contain long chains of nucleotides that repeat, and there’s A, C, G, and T. In the DNA and RNA, there are identical three nucleotides found in DNA, but the Uracil replaces it. The nucleotide is essentially the component of these molecules. It is made by cells one at a time and later strung together via the process of replication, which takes the forms of DNA or transcription when you’re creating the RNA.
Finding the DNA structure
A key clue to understanding how nucleic acids was discovered from the research done by Erwin Chargaff.
While analyzing DNA, he observed that the amounts in G, C, T, and A in DNA varied among organisms but were similar (or quite similar) for all organisms belonging to the same species or type.
However, The ratios between A and T and G were always the same as 1. No matter where the DNA originated from (note: this rule does not apply to the RNA. The ratios of A to T and G to C were always equal to 1.
Watson Crick
With these principles in mind, James Watson and Francis Crick constructing the DNA model that matched the molecular and structural information, using structural information from Rosalind Franklin.
Their structure was double helical, two nucleotide polymer chains ran parallel to one another, and the bases were stacked in the middle.
DNA is made up of repeated structures called nucleotides
Explanation
Nucleic acids are made up of four elements: carbon (C) and hydrogen (H) and oxygen (O) and nitrogen (N), and phosphorus (P). These elements are combined and form the basic units, known as nucleotides. DNA is made up of two nucleotide chains which make up a double helix, and it encodes all the organism’s genetic information using the nucleotide sequence. Nucleotides comprise the molecules which make up DNA, and they are made by a phosphate group, the sugar (deoxyribose), and the nitrogen base. In this way, we can consider DNA to function as the nucleotide template.
NICE