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The coupling between base units of DNA i...

The coupling between base units of DNA is through
(a)hydrogen bonding
(b)electrostatic bonding
(c)covalent bonding
(d)van der waals' forces

A

hydrogen bonding

B

electrostatic bonding

C

covalent bonding

D

van der waals' forces

Text Solution

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The correct Answer is:
To determine the type of bonding that couples the base units of DNA, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding DNA Structure**: - DNA consists of two strands that form a double helix. Each strand is made up of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base. 2. **Identifying Base Units**: - The nitrogenous bases in DNA are categorized into two groups: purines (adenine and guanine) and pyrimidines (cytosine and thymine). 3. **Base Pairing**: - In DNA, specific base pairing occurs: adenine (A) pairs with thymine (T) and cytosine (C) pairs with guanine (G). 4. **Type of Bonding**: - The question asks about the type of bonding that occurs between these base pairs. - Adenine and thymine are held together by two hydrogen bonds, while cytosine and guanine are held together by three hydrogen bonds. 5. **Conclusion**: - Since the base pairs are connected through hydrogen bonds, the correct answer to the question is (a) hydrogen bonding. ### Final Answer: The coupling between base units of DNA is through (a) hydrogen bonding. ---
To determine the type of bonding that couples the base units of DNA, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding DNA Structure**: - DNA consists of two strands that form a double helix. Each strand is made up of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base. 2. **Identifying Base Units**: ...
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