AIIMS 2019 Botany DNA Structure MCQ Question
Arrange them on the basis of increasing size:
Nucleotide, chromosome, gene, genome
Genome, chromosome, Nucleotide gene
Nucleotide, genome, gene, chromosome
Nucleotide, gene, chromosome, genome
Correct Answer
Detailed Explanation
In option B, the arrangement of components from smallest to largest is accurate: a nucleotide is the basic building block of DNA, a gene is a segment of DNA made up of nucleotides that encodes a specific trait, a chromosome is a structure composed of tightly coiled DNA containing many genes, and a genome encompasses the complete set of genetic material in an organism, including all its chromosomes.
Other options are incorrect because they misplace the hierarchical structure of genetic organization; for instance, option A incorrectly lists "gene" before "chromosome," and option C places "genome" before "gene," which does not reflect their relative sizes. Understanding this hierarchy is crucial for grasping the organization of genetic material in biology.
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