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In DNA adenine and thymine are paired wi...

In DNA adenine and thymine are paired with how many hydrogen bonds ?

A

One

B

Two

C

Three

D

Four

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many hydrogen bonds are formed between adenine and thymine in DNA, we can follow these steps: ### Step 1: Understand the Structure of DNA DNA is a double-stranded molecule composed of nucleotides. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base. **Hint:** Remember that DNA has two strands that twist around each other to form a double helix. ### Step 2: Identify the Nitrogenous Bases There are four nitrogenous bases in DNA: adenine (A), thymine (T), guanine (G), and cytosine (C). Adenine and guanine are classified as purines, while thymine and cytosine are classified as pyrimidines. **Hint:** Recall the classification of the bases: purines have a double-ring structure, while pyrimidines have a single-ring structure. ### Step 3: Pairing of Bases In DNA, adenine pairs specifically with thymine (A-T), and guanine pairs with cytosine (G-C). The pairing is crucial for the stability of the DNA structure. **Hint:** Think about the complementary nature of base pairing in DNA. ### Step 4: Determine the Number of Hydrogen Bonds Adenine and thymine are connected by two hydrogen bonds. In contrast, guanine and cytosine are connected by three hydrogen bonds. **Hint:** Remember the specific hydrogen bond counts for A-T and G-C pairs. ### Step 5: Conclusion Since the question asks how many hydrogen bonds are formed between adenine and thymine in DNA, the answer is **2 hydrogen bonds**. **Final Answer:** The correct option is B: 2.
To determine how many hydrogen bonds are formed between adenine and thymine in DNA, we can follow these steps: ### Step 1: Understand the Structure of DNA DNA is a double-stranded molecule composed of nucleotides. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base. **Hint:** Remember that DNA has two strands that twist around each other to form a double helix. ### Step 2: Identify the Nitrogenous Bases ...
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