THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
A nitrogenous base and a phosphate group
|
|
|
A nitrogenous base and a pentose sugar
|
|
|
A nitrogenous base, a phosphate group, and a pentose sugar
|
|
|
A pentose sugar and a purine or pyrimidine
|
Detailed explanation-1: -Top Answer. D )Explanation: A nucleotide is composed of three units. The pentose sugar (ribose or deoxyribose), a phosphate group and a nitrogenous base (pyrimidine or purine).
Detailed explanation-2: -Definition. A nucleotide is the basic building block of nucleic acids (RNA and DNA). 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).
Detailed explanation-3: -nucleotide, any member of a class of organic compounds in which the molecular structure comprises a nitrogen-containing unit (base) linked to a sugar and a phosphate group.
Detailed explanation-4: -Nucleic acids are macromolecules, which means they are molecules composed of many smaller molecular units. Thes units are called nucleotides, and they are chemically linked to one another in a chain. In DNA, the nucleotides are referred to in shorthand as A, C, T, and G. In RNA, the nucleotides are A, C, U, and G.
Detailed explanation-5: -This statement is true. Each nucleotide will consist of three components: a pentose sugar (it may be deoxyribose, or ribose), a phosphate group, and a nitrogenous base bound to the pentose sugar (depending on the nucleic acid, it may be adenine, cytosine, guanine, and either thymine or uracil).