The Question is from neet-botany biomolecules-biology , and it was created by the author Mr. NARESH KUMAR K

Question

Which of the following nitrogenous bases is a purine?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: [Option D]
## CONCEPT FRAMEWORK
	**Primary Concept**: Classification of nitrogenous bases
	**Related Topics**: DNA structure, RNA structure, nucleotides
	**Prerequisites**: Understanding of purines and pyrimidines
## SOLUTION PATHWAY
**Given Information**:
		1. The four nitrogenous bases in nucleic acids are: Cytosine, Thymine, Uracil, and Guanine.
		2. Purines are a category of nitrogenous bases that consist of two fused rings.
**Method & Steps**:
	1. Identify the nitrogenous bases provided in the options.
		Reasoning: Cytosine, Thymine, and Uracil are known to be pyrimidines, which have a single ring structure.
		Formula/Rule: Purines = Adenine + Guanine; Pyrimidines = Cytosine + Thymine + Uracil
	2. Evaluate which of the options is a purine.
		Working: Among the options, Guanine is a purine.
		Key Point: Guanine is one of the two purines, the other being Adenine.
	3. Conclude that the correct answer is Guanine.
		Result: Guanine is a purine.
		Verification: Comparing with known classifications of nitrogenous bases confirms Guanine as a purine.
## OPTION ANALYSIS
[A] :x: Cytosine is a pyrimidine, not a purine.
[B] :x: Thymine is a pyrimidine, not a purine.
[C] :x: Uracil is a pyrimidine, not a purine.
[D] ✓: Guanine is a purine, as it has a double-ring structure.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing purines with pyrimidines: Remember that purines (Adenine, Guanine) have a two-ring structure, while pyrimidines (Cytosine, Thymine, Uracil) have a single-ring structure.
		2. Forgetting the pairs: Purines pair with pyrimidines (A with T or U, G with C) in DNA and RNA.
	**Quick Tips**:
		1. Remember the mnemonic "Pure As Gold" to recall that Adenine (A) and Guanine (G) are purines.
		2. Visualize the structures: Draw the basic structures of purines and pyrimidines to differentiate them easily.

Mr. NARESH KUMAR K · Answer

Cytosine

Mr. NARESH KUMAR K · Answer

Thymine

Mr. NARESH KUMAR K · Answer

Uracil

Mr. NARESH KUMAR K · Answer

The correct Option is "Guanine"

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