Nucleotide
/ˈnuːkliəˌtaɪd/
Definition
Nucleotide refers to a biological molecule that serves as the basic building block of DNA and RNA in plant cells. Each one contains a sugar, a phosphate group, and a nitrogen-containing base. Beyond forming genetic material, some nucleotides also help transfer energy, such as ATP, or take part in cell signaling and metabolism. This distinguishes them from nucleosides, which lack the phosphate group.
Role in Plant Biology
- DNA and RNA assembly: In plants, nucleotide units are joined to build DNA and RNA, so they underpin cell division, leaf formation, flowering, and seed development.
- Energy transfer compounds: Some forms act in energy-carrying molecules such as ATP, which helps drive photosynthesis, sugar transport, active nutrient uptake, and many enzyme-controlled reactions.
- Cell signaling links: Certain nucleotide-derived compounds help relay internal signals that coordinate responses to light, drought, salinity, and pathogen attack.
- Genetic change and breeding: Changes in nucleotide sequence create genetic variation. That variation is the basis of inherited traits used in plant breeding, selection, and modern DNA-based identification.
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