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DNA molecules have small units called.
A. Uracil
B. Muton
C. Cistron
D. Recon
E. Nucleotide.

Last updated date: 20th Jun 2024
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Hint: DNA is the biological macromolecule, which is the genetic material in most complex organisms, DNA is formed of a deoxyribose sugar, phosphate group, and purine and pyrimidine base pairs, these base-pair show hydrogen bonding.

Complete answer:
A DNA is an organic molecule which is a polymeric chain made up of nucleotide sequences, and nucleotide is made up of sugar, a phosphate group, and a nitrogenous base.
Nucleotide: It is the smallest unit of DNA which consists of nucleoside and phosphate groups. It is the monomeric unit of nucleic acids such as DNA and RNA, such as Nucleic acid form the genetic material and protein molecules. Nucleotide plays a crucial role in metabolism at the cellular level which provides energy in form of nucleoside triphosphates such as adenosine triphosphate (ATP), Guanosine triphosphate (GTP), Cytidine triphosphate (CTP), and Thymidine triphosphate (TTP) during amino acid, protein, and cell membrane synthesis.
Uracil: It is one of the nitrogenous base pairs that belongs to the six-membered ring structure of pyrimidine. Apart from this uracil, Cytosine and thymine also group into the pyrimidine base pair. It is mainly present in RNA in replacement of thymine.
Muton: It is the smallest length of DNA segment which gives rise to new expression due to mutation in DNA.
Recon: It is the smallest unit of a DNA segment that also gives rise to new expression due to recombination in DNA.
Cistron: It is the smallest and functional segment of DNA length, which codes protein during the translation process.
Hence, the correct answer is option E.

Note: Along with DNA, RNA also serves as genetic material in a primitive organism, which may be double-stranded or single-stranded found in different genus or species of the organism. RNA is different from DNA due to the presence of ribose sugar and uracil base instead of thymine.