![]() When phosphate groups link together to form chains, as in ATP (adenosine triphosphate), the link looks like O-P-O-P-O-P-O, with two additional oxygen atoms attached to each phosphorus, one on either side of the atom. In DNA, the specific sugar in the nucleotides is deoxyribose (which makes up the D in DNA). One atom of oxygen is connected to the 5-carbon in the sugar and to the phosphorus atom. The nitrogen bases form the double-strand of DNA through weak hydrogen bonds. Each nucleotide is made of a phosphate, a sugar, and a nitrogenous base. ![]() The only difference between them is that 2'-deoxyribose has one less oxygen atom attached to the second carbon.Ī single phosphate group is PO 4 3. The four oxygen atoms in the phosphate groups are linked to the phosphorus atom forming a tetrahedral geometry. ![]() forms the backbone of DNA and forms the inside. The sugar-phosphate groups form the backbone of the single strand of DNA. The carbons are numbered sequentially, to help keep track of where groups are attached. Which shows the correct complementary base pairing for DNA answer choices C-A, T-G A-G, C-T C-G, U-A T-A, G-C Question 3 120 seconds Q. Both ribose and deoxyribose are 5-carbon sugars. In RNA, the bases are adenine, guanine, uracil, and cytosine. In DNA, the bases are adenine (A), thymine (T), guanine (G), and cytosine (C). Cytosine, thymine, and uracil are pyrimidines. DNA DNA consists of a large backbone string which are negatively charged phosphates with sugar groups. Polynucleotide structure is always written left to right in the 5 to 3. Like the primary structure of a polypeptide, polynucleotides have a sequence of side chainsin this case, the bases. Purines and pyrimidines are the two categories of nitrogenous bases. This creates a ribose-phosphate backbone and a 5-end that is phosphorylated the 3-end has a free 3-hydroxyl (Fig.
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