Which of the following tentative base-pairs (designated A-F) actually exist in a double-stranded DNA and are referred to as canonical Watson-Crick base-pairs? B NH, NH, లోడం కషరి కలు NH HN H,N DAA De B OcC DE E ORF

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Chapter1: Chemical Foundations
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**Question:**
Which of the following tentative base-pairs (designated A-F) actually exist in a double-stranded DNA and are referred to as canonical Watson-Crick base-pairs?

**Diagrams:**
The image displays six chemical structures labeled A through F, representing different base-pair configurations. Each pair comprises two nitrogenous bases connected by dashed lines indicating hydrogen bonds, which are crucial for the base-pair stabilization in DNA.

**Diagram Details:**

- **A:** Two structures aligned side by side potentially with hydrogen bonds between them.
- **B:** Similar arrangement as A with alternate bases.
- **C:** Structure showing base pairs and hydrogen bond alignments.
- **D:** Another configuration with precise hydrogen bonding.
- **E:** Displays bases and their bonding.
- **F:** Shows a distinct arrangement, likely purine-pyrimidine based.

**Answer Options:**
- ☐ A
- ☐ B
- ☐ C
- ☐ D
- ☐ E
- ☐ F

These structures aim to depict canonical base-pairing in DNA, predominantly adenine (A) with thymine (T) and guanine (G) with cytosine (C). Identifying canonical pairs involves recognizing the correct hydrogen bonding pattern seen in DNA.
Transcribed Image Text:**Question:** Which of the following tentative base-pairs (designated A-F) actually exist in a double-stranded DNA and are referred to as canonical Watson-Crick base-pairs? **Diagrams:** The image displays six chemical structures labeled A through F, representing different base-pair configurations. Each pair comprises two nitrogenous bases connected by dashed lines indicating hydrogen bonds, which are crucial for the base-pair stabilization in DNA. **Diagram Details:** - **A:** Two structures aligned side by side potentially with hydrogen bonds between them. - **B:** Similar arrangement as A with alternate bases. - **C:** Structure showing base pairs and hydrogen bond alignments. - **D:** Another configuration with precise hydrogen bonding. - **E:** Displays bases and their bonding. - **F:** Shows a distinct arrangement, likely purine-pyrimidine based. **Answer Options:** - ☐ A - ☐ B - ☐ C - ☐ D - ☐ E - ☐ F These structures aim to depict canonical base-pairing in DNA, predominantly adenine (A) with thymine (T) and guanine (G) with cytosine (C). Identifying canonical pairs involves recognizing the correct hydrogen bonding pattern seen in DNA.
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