QQuestionBiochemistry
QuestionBiochemistry
Explain the differences between purines and pyrimidines. List the purines and pyrimidines, and explain which ones bond together.
Base size
Bases
Bases bond with:
Purines
Pyrimidines
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Answer
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Step 1:I'll solve this problem step by step, focusing on the differences between purines and pyrimidines:
Step 2:: Definition of Purines and Pyrimidines
Purines and pyrimidines are two types of nitrogenous bases found in nucleic acids (DNA and RNA). They differ in their chemical structure and molecular size: - Purines: Larger, double-ring structures - Pyrimidines: Smaller, single-ring structures
Step 3:: Purine Bases
The purine bases are:
Step 4:
Adenine (A)
Step 5:
Guanine (G) Characteristics of Purines: - Molecular structure: Double-ring structure - Base size: Larger - Molecular weight: Heavier
Step 6:: Pyrimidine Bases
The pyrimidine bases are:
Step 7:
Cytosine (C)
Step 8:
Thymine (T) - in DNA
Step 9:
Uracil (U) - in RNA (replaces Thymine) Characteristics of Pyrimidines: - Molecular structure: Single-ring structure - Base size: Smaller - Molecular weight: Lighter
Step 10:: Base Pairing
Base pairing follows specific rules: - Purines always bond with Pyrimidines - Specific base pairs:
Step 11:
Adenine (A) bonds with Thymine (T) or Uracil (U)
Step 12:
G \equiv C
Guanine (G) bonds with Cytosine (C) Bonding pattern:
Final Answer
Purines (A, G) are larger, double-ring bases that always bond with smaller, single-ring pyrimidines (T/U, C) in a complementary base pairing pattern specific to DNA and RNA.
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