DNA Lengths and Nucleotide Counts

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Questions and Answers

What are the two types of nitrogenous bases?

The two types of nitrogenous bases are Purines (Adenine and Guanine) and Pyrimidines (Cytosine, Uracil, and Thymine).

What are the three components of a nucleotide?

The three components of a nucleotide are a nitrogenous base, a pentose sugar, and a phosphate group.

Which nitrogenous base is present in DNA but not in RNA?

Thymine is present in DNA but not in RNA.

What is the difference between a nucleoside and a nucleotide?

A nucleoside is formed when a nitrogenous base is linked to the OH of 1' C pentose sugar through a N-glycosidic linkage. A nucleotide is formed when a phosphate group is linked to OH of 5' C of a nucleoside through a phosphoester linkage. Signup and view all the answers

How are nucleotides joined to form a polynucleotide chain?

Nucleotides are joined through 3'-5' phosphodiester linkage to form a polynucleotide chain. Signup and view all the answers

What is the difference between a nucleoside and a nucleotide?

A nucleoside consists of a nitrogenous base linked to a sugar molecule, while a nucleotide is a nucleoside with one or more phosphate groups attached. Signup and view all the answers

What are the ends of a polynucleotide chain referred to as?

The end of a polynucleotide chain that has a free phosphate moiety at the 5' -end of the sugar is referred to as the 5’-end. The end that has a free OH of the 3'C group is referred to as the 3' -end. Signup and view all the answers