The model is called a double helix because two long strands twist around each other like a twisted ladder. The rails of the ladder are made of alternating sugar and phosphate molecules. The steps of the ladder are made of two bases joined together with either two or three weak hydrogen bonds.
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1.to conclude, nucleotides are important as they form the building blocks of nucleic acids, such as dna and rna. nucleotides are made up of 3 parts. the first is a distinct nitrogenous base, which is adenine, cytosine, guanine or thymine. in rna, thymine is replaced by uracil.
4.the nitrogenous bases form hydrogen bonds between opposing dna strands to form the rungs of the "twisted ladder" or double helix of dna or a biological catalyst that is found in the nucleotides. adenine is always paired with thymine, and guanine is always paired with cytosine. these are known as base pairs.
5and 6.adenine are always be an equal number or pair with thymine nucleotides in molecule because of their chemical structure. yes! guanine are always be an equal number or pair with cytosine nucleotides in molecule because of their chemical structure.
8.the sides of the ladde are made up of alternating sugar and phospate molecules.the steps(rungs)of the ladder are made up of hydrogen bonds held together by hydrogen.