Question

Select the correct order of structure that carries genetic information from least complex to most complex?
I. Chromosome
II. Base pair
III. Codon
IV. Gene

• A. $I\to II\to III\to IV$
• B. $II\to III\to I\to IV$
• C. $III\to II\to I\to IV$
• D. $II\to III\to IV\to I$
• E. $II\to IV\to II\to I$

Answer 1

The correct option is D $II\to III\to IV\to I$

DNA is a polymer of deoxyribonucleotides which in turn consist of a pentose sugar, a nitrogenous base and phosphate moiety. Two complementary bases of two DNA strands are joined together by H bond and make a base pair (II). Three successive nucleotides of DNA constitute a codon (III) that specifies an amino acid. Genes (IV) are the stretch of DNA that code for a particular protein and are linearly arranged on chromosomes (I). Thus, the correct answer is option D.