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When part of a nucleotide in a nucleic acid chain, which of the following may base pair with uridine nucleotides? Choose all correct answers and assume normal Watson-Crick base pairing. Oc с O E

When part of a nucleotide in a nucleic acid chain, which of the following may base pair with uridine nucleotides? Choose all correct answers and assume normal Watson-Crick base pairing. Oc с O E

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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**Question:** When part of a nucleotide in a nucleic acid chain, which of the following may base pair with uridine nucleotides? Choose all correct answers and assume normal Watson-Crick base pairing. - [ ] A - [ ] B - [ ] C - [ ] D - [ ] E
Transcribed Image Text:**Question:** When part of a nucleotide in a nucleic acid chain, which of the following may base pair with uridine nucleotides? Choose all correct answers and assume normal Watson-Crick base pairing. - [ ] A - [ ] B - [ ] C - [ ] D - [ ] E
### Nucleotide Structures Overview Below are the structural formulas of several nucleotides, essential building blocks of nucleic acids. #### Diagram Descriptions: 1. **Diagram A**: - This compound is an adenine nucleotide. - Structure features a purine base with an amine group (NH2) attached to position 6. 2. **Diagram B**: - This represents a guanine nucleotide. - Structure features a purine base with a keto group (C=O) at position 6 and an amine group at position 2. 3. **Diagram C**: - This compound is a cytosine nucleotide. - It consists of a pyrimidine base with a keto group at position 2 and an amine group at position 4. 4. **Diagram D**: - This represents a thymine nucleotide. - It features a pyrimidine base with one keto group at position 2 and another keto group at position 4, and a methyl group at position 5. 5. **Diagram E**: - This is a uracil nucleotide. - Structure features a pyrimidine base with keto groups at positions 2 and 4, similar to thymine but without the methyl group. ### Detailed Analysis: **Diagram A - Adenine:** - Adenine is characterized by a double-ring structure, known as a purine. - An amine group (NH2) is attached to the 6th carbon of the purine ring. **Diagram B - Guanine:** - Guanine also features a double-ring structure (purine). - It has a carbonyl group (C=O) on the 6th carbon and an amine group on the 2nd carbon of the purine ring. **Diagram C - Cytosine:** - Cytosine is a single-ring structure, classified as a pyrimidine. - It contains one carbonyl group at the 2nd position and an amine group at the 4th position. **Diagram D - Thymine:** - Thymine is another pyrimidine. - It features a methyl group (CH3) on the 5th carbon and carbonyl groups at the 2nd and 4th positions. **Diagram E - Uracil:** - Uracil is similar in structure to thymine but lacks the methyl group. - It contains carbon
Transcribed Image Text:### Nucleotide Structures Overview Below are the structural formulas of several nucleotides, essential building blocks of nucleic acids. #### Diagram Descriptions: 1. **Diagram A**: - This compound is an adenine nucleotide. - Structure features a purine base with an amine group (NH2) attached to position 6. 2. **Diagram B**: - This represents a guanine nucleotide. - Structure features a purine base with a keto group (C=O) at position 6 and an amine group at position 2. 3. **Diagram C**: - This compound is a cytosine nucleotide. - It consists of a pyrimidine base with a keto group at position 2 and an amine group at position 4. 4. **Diagram D**: - This represents a thymine nucleotide. - It features a pyrimidine base with one keto group at position 2 and another keto group at position 4, and a methyl group at position 5. 5. **Diagram E**: - This is a uracil nucleotide. - Structure features a pyrimidine base with keto groups at positions 2 and 4, similar to thymine but without the methyl group. ### Detailed Analysis: **Diagram A - Adenine:** - Adenine is characterized by a double-ring structure, known as a purine. - An amine group (NH2) is attached to the 6th carbon of the purine ring. **Diagram B - Guanine:** - Guanine also features a double-ring structure (purine). - It has a carbonyl group (C=O) on the 6th carbon and an amine group on the 2nd carbon of the purine ring. **Diagram C - Cytosine:** - Cytosine is a single-ring structure, classified as a pyrimidine. - It contains one carbonyl group at the 2nd position and an amine group at the 4th position. **Diagram D - Thymine:** - Thymine is another pyrimidine. - It features a methyl group (CH3) on the 5th carbon and carbonyl groups at the 2nd and 4th positions. **Diagram E - Uracil:** - Uracil is similar in structure to thymine but lacks the methyl group. - It contains carbon
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