In DNA , the attached sugar is deoxyribose. Nucleosides have slightly different names than their nitrogenous base parents, and depend upon the identity of the sugar. What is the identity of the nucleoside displayed in the computer model? A nucleoside with one or more phosphate groups attached to the sugar is called a nucleotide.
The name of a nucleotide is the corresponding nucleoside name, followed by the word 'monophosphate,' 'diphosphate,' or 'triphosphate' to indicate the number of phosphate groups attached to the sugar.
Click the button below to examine the structure of a nucleotide triphosphate. What is the identity of the nucleotide triphosphate displayed in the computer model? Adenosine triphosphate ATP. Deoxyadenosine triphosphate dATP. Guanosine triphosphate GTP. Deoxyguanosine triphosphate dGTP. Thymidine triphosphate TTP. Click the button below to examine the structure of deoxyadenine monosphosphate dAMP. Notice the angle of the sugar and phosphate groups in relation to the planar nitrogenous base.
In double-stranded DNA, two long molecules twist around one another in a double helix. These molecules are d eoxy n ucleic a cids DNA : polymers made up of nucleotides In a DNA double helix, the phosphate and sugar groups make up the outer 'backbones,' and the flat nitrogenous bases are pointed toward the middle of the helix. Click the buttons below to examine a segment of a DNA double helix from many angles. The first button has colored the backbone sugar and phosphate groups purple to simplify the image.
One key point to notice in the DNA double helix structure is that the planar nitrogenous bases from the two strands are pointing toward each other, in the middle of the helix. Pairs of nitrogenous bases are set in the same plane, and interact with each other via hydrogen bonding.
These pairs are often referred to as base pairs , abbreviated 'bp. Recall that electronegativity values generally increase toward the top and right of the periodic table, as illustrated in the image below.
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