differentiate between DNA and RNA on occurence
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Answer:
Explanation: Both DNA and RNA consist of subunits called nucleotides. Each nucleotide contains a sugar molecule chemically bonded to a phosphate molecule, which consists of phosphorus and oxygen atoms bonded together; this complex makes up the sides of the ladder or helix. In DNA, the sugar molecule is called deoxyribose because it lacks an oxygen atom whereas in RNA, the sugar is ribose, which is richer in oxygen. Bonded to the sugar are molecules called nitrogenous bases that connect the two sides of the ladder together; these bases form the rungs of the helix. The bases that make up the nucleotides in RNA consist of guanine, cytosine, adenine and uracil; DNA has the bases guanine, cytosine, adenine and thymine. Only certain bases bond with one another; adenine always binds to thymine in DNA or uracil in RNA, whereas cytosine only binds with guanine.
DNA exists naturally as a double helix structure, which looks like a ladder that has been twisted. RNA, on the other hand, consists of a single strand that folds into various shapes. Scientists used to think that RNA, not DNA, was the basis of life because it can also store the information needed to make proteins. After further research, DNA was then heralded to be the blueprint of life because it is chemically more stable than RNA; additionally, because DNA has two strands, even if one strand becomes corrupt, the other strand still can provide a reliable template for making proteins.
DNA's only function is to contain the code to make proteins. Almost everything happening inside a cell needs proteins. From the structure of cells to the functioning of enzymes that make certain essential chemical reactions possible, proteins are basic to all life. Organisms need a way to ensure that proteins would be able to be made faithfully, and DNA provides the blueprint for these proteins to be synthesized. Because DNA is unable to leave the cell nucleus, a strand of messenger RNA (mRNA) is made from the DNA template, and this mRNA can travel outside the nucleus. The mRNA arrives at the ribosomes, the cell's protein-making factories, and binds to them. Transfer RNA (tRNA) carry amino acids to the ribosome to bond to the mRNA strand. Ribosomal RNA (rRNA) actually act as part of the ribosome to hold the mRNA strand in place