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Two or more nucleotides of RNA or DNA ar...

Two or more nucleotides of RNA or DNA are joined as

A

`3'-5'`

B

`5'-5'`

C

`3'-3'`

D

`5'-3'`

Text Solution

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The correct Answer is:
To answer the question, "Two or more nucleotides of RNA or DNA are joined as," we need to understand how nucleotides link together to form nucleic acids like DNA and RNA. ### Step-by-Step Solution: 1. **Understanding Nucleotides**: - Nucleotides are the building blocks of nucleic acids. Each nucleotide consists of three components: a nitrogenous base (adenine, guanine, cytosine, thymine in DNA, and uracil in RNA), a five-carbon sugar (deoxyribose in DNA and ribose in RNA), and one or more phosphate groups. 2. **Formation of Nucleic Acids**: - When nucleotides join together, they form a polynucleotide chain. This process involves the formation of a covalent bond between the phosphate group of one nucleotide and the sugar of another nucleotide. 3. **Phosphodiester Bond**: - The specific type of bond that links nucleotides together is called a phosphodiester bond. This bond forms between the 3' carbon atom of one sugar and the phosphate group attached to the 5' carbon of the next sugar. 4. **Directionality of the Chain**: - The nucleic acid chain has a directionality, which is indicated as 5' to 3'. This means that the chain starts with a phosphate group at the 5' end and ends with a hydroxyl group at the 3' end. 5. **Conclusion**: - Therefore, when two or more nucleotides are joined together, they are linked from the 3' end of one nucleotide to the 5' end of another nucleotide, forming a chain in the 5' to 3' direction. ### Final Answer: Two or more nucleotides of RNA or DNA are joined as **3' to 5'** (the linkage is from the 3' end of one nucleotide to the 5' end of another).
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