A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T). In RNA, the base uracil (U) takes the place of thymine.
What structure is formed by deoxyribose phosphoric acid and a nitrogen base?
Nucleotides
Nucleotides are composed of phosphoric acid, a pentose sugar (ribose or deoxyribose), and a nitrogen-containing base (adenine, cytosine, guanine, thymine, or uracil). Ribonucleotides contain ribose, while deoxyribonucleotides contain deoxyribose.
What are the 3 basic structures of a nucleotide?
Each nucleotide, in turn, is made up of a nitrogenous base, a pentose sugar, and a phosphate.
Which of the structures is deoxyribose?
In aqueous solution, deoxyribose primarily exists as a mixture of three structures: the linear form H−(C=O)−(CH2)−(CHOH)3−H and two ring forms, deoxyribofuranose (“C3′-endo”), with a five-membered ring, and deoxyribopyranose (“C2′-endo”), with a six-membered ring.
Which of the following is together formed by deoxyribose sugar & A nitrogen base?
A DNA nucleotide is composed of a deoxyribose (five carbon sugar) with an attached nitrogenous base (adenine [A], guanine [G], cytosine [C], or thymine [T]) and a phosphate group.
Which bases pairs with cytosine?
guanine
In base pairing, adenine always pairs with thymine, and guanine always pairs with cytosine.
Which is pyrimidine base?
Cytosine and thymine are the two major pyrimidine bases in DNA and base pair (see Watson–Crick Pairing) with guanine and adenine (see Purine Bases), respectively.
Which carbon of deoxyribose does the base attach to?
2: The 5-Carbon Sugar Deoxyribose. During nucleotide production, the nitrogenous base will attach to the 1′ carbon and the phosphate group will attach to the 5′ carbon.
Which nitrogen base is complementary to cytosine?
Guanine
Guanine and cytosine make up a nitrogenous base pair because their available hydrogen bond donors and hydrogen bond acceptors pair with each other in space. Guanine and cytosine are said to be complementary to each other.
What is the structure of deoxyribose?
Deoxyribose may exist as a five- or six-membered ring or as a linear molecule on its own. Since it is a five-carbon molecule with a carbonyl group at the end, deoxyribose is referred to as an aldopentose. It appears as deoxyribofuranose, or a five-membered ring, in the image above.
Does the deoxyribose base change from one nucleotide to the next?
Although the deoxyribose base does not change from one nucleotide to the next, it creates a strong support for the working molecules of DNA. The only difference between RNA and DNA is the presence of deoxyribose instead of ribose. An enzyme known as ribonucleotide reductase removes an oxygen molecule from one of the carbons of a ribose sugar.
What are the four types of nitrogenous bases in DNA?
There are four types of nitrogenous bases in DNA. Adenine (A) and guanine (G) are double-ringed purines, and cytosine (C) and thymine (T) are smaller, single-ringed pyrimidines. The nucleotide is named according to the nitrogenous base it contains. Figure 9.3 (a) Each DNA nucleotide is made up of a sugar, a phosphate group, and a base.
What are the three components of A deoxyribonucleotide?
The three components of a deoxyribonucleotide are a five-carbon sugar called deoxyribose, a phosphate group, and a nitrogenous base, a nitrogen-containing ring structure that is responsible for complementary base pairing between nucleic acid strands (Figure 10.2. 1 ).
