Nucleotides and Bases Nucleotides A nucleotide is the basic structural unit and building block for DNA. Adenine and guanine are purine bases found in both DNA and RNA. A nucleotide is composed of 3 parts: * five-sided sugar * phosphate group * nitrogenous base (nitrogen containing) The … Nitrogenous Bases: DNA is made up of four different nitrogenous bases that will pair up in a specific configuration. Cytosine is a pyrimidine base found in both DNA … We explain Base Pairing of Nitrogenous Bases with video tutorials and quizzes, using our Many Ways(TM) approach from multiple teachers. Watson and Crick discovered that DNA had two sides, or strands, and that these strands were twisted together like a twisted ladder -- the double helix . The structure of DNA consists of two strands of nucleotides that are paired together to form a ladder-like structure. These building blocks are hooked together to form a chain of DNA. 1. hydrogen bonds. An important discovery regarding the structure of DNA was made by Edwin Chargaff in 1949. Chemical structures of the five nitrogenous bases are shown below. In DNA the nitrogenous bases are adenine, guanine, thymine, and cytosine: cytosine pairs with guanine. The structure of DNA consists of two strands of nucleotides that are paired together to form a ladder-like structure. The four nitrogen-containing bases found in DNA are A, T, C and G. A and G are classified as "purines," while C and T are considered as "pyrimidines." The nitrogenous bases on the two strands of DNA pair up, purine with pyrimidine (A with T, G with C), and are held together by weak hydrogen bonds. Between the two strands of a DNA segment the nitrogen bases are held together by _____. The nitrogenous bases are stacked in the interior in pairs, like the steps of a staircase; the pairs are bound to each other by hydrogen bonds. Nitrogen bases pair with bases that are _____. covalent bonds hydrogen bonds ionic bonds metallic bonds. DNA forms double-stranded helices; RNA has a single-stranded structure. The two strands are held together by base pairing between nitrogenous bases of one strand and nitrogenous bases from the other strand. Base pairing takes place between a purine and pyrimidine stabilized by hydrogen bonds: A pairs with T via two hydrogen bonds and G pairs with C via three hydrogen bonds. The red N atom in each molecule is the point of attachment for a sugar molecule (ribose or deoxyribose). thymine pairs with adenine. Discover the nitrogenous bases of each nucleotide and how they combine into specific combinations to form the structure of DNA. We explain Base Pairing of Nitrogenous Bases with video tutorials and quizzes, using our Many Ways(TM) approach from multiple teachers. The two strands of the helix run in opposite directions, so that the 5′ carbon end of one strand faces the 3′ carbon end of its matching strand. DNA will contain adenine, cytosine, guanine, and thymine bases. Discover the nitrogenous bases of each nucleotide and how they combine into specific combinations to form the structure of DNA. In RNA, thymine is replaced with uracil and it pairs with adenine. 2. 3. Nitrogenous Bases. Purines are bigger in size compared to pyrimidines. Base pairs occur when nitrogenous bases make hydrogen bonds with each other. Cytosine still pairs with guanine in RNA. Two different types of nucleic acids, DNA and RNA, contain different nitrogenous bases: A, T, G, C, U, and modified bases. A molecule of DNA consists of two strands that form a double helix structure. Each base has a specific partner: guanine with cytosine, adenine with thymine (in DNA) or adenine with uracil (in RNA). 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