The answer is: All nucleotides have a phosphorus atom that can be replaced with 32P.
DNA building blocks are nucleotides. Nucleotides contain a nitrogenous base, a five-carbon sugar, and, at least, one phosphate group. Exactly that phosphate group in the nucleotide has the phosphorus atom. Therefore, the phosphorus atom in the nucleotide can be replaced with radioactive phosphorus-32 (32P). This replacement has a wide use in labeling nucleic acids and thereby visualizing the target molecule.
The atoms in any compound are held together by some bonds. These bonds are chemical bonds.
A chemical bond is an attractive force which hold the various components of a compound together. It provides stability to the compound by loss of energy. The more strong a chemical bond, the stronger is the chemical compound.
A compound is the bonding of two or more atoms tied together. It can be a molecule or a group bound together. To or more different atoms which are together but not covalently bound is a mixture.
Types of chemical bonds found commonly are:
1. Ionic bonds
2. Hydrogen bonds
3. Covalent bonds
4. Polar bonds
Hence, the atoms in a compound are held together by chemical bonds.
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species
phyla
genera
A genus is subdivided into smaller groups called species. Therefore, option (B) is correct.
Taxonomy is the study and practice of categorizing or classifying. A taxonomy (or taxonomical classification) is a categorization scheme, especially a hierarchical classification, that organizes things into groups or kinds.
There are seven primary taxonomic ranks: kingdom, phylum, class, order, family, genus, and species. In addition, domain, which was proposed by Carl Woese, is now commonly used as a fundamental rank, although not being listed in any of the nomenclature laws, and is synonymous with dominion.
A genus is a taxonomic rank composed of species grouped based on shared features (having similar structures or dissimilar characteristics) or evolutionary relationship. It is one of the eight major taxonomic ranks used to classify living organisms. It is subordinate to the family and superior to the species.
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