Which one of the following is wrong statementa)Anabaena and Nostoc are...
Phosphorus is a constituent of all nucleic acids ...so, 3rd statement is wrong....(refer ncert)..
Which one of the following is wrong statementa)Anabaena and Nostoc are...
Incorrect Statement: Phosphorus is a constituent of cell membranes, certain nucleic acids and not in cell proteins.
Explanation:
Phosphorus is an essential element required for the growth and development of living organisms. It is present in various cellular components of organisms such as nucleic acids, cell membranes, and proteins. The given statement is incorrect as it implies that phosphorus is not present in cell proteins, which is not true.
Phosphorus in Nucleic Acids:
The building blocks of nucleic acids, i.e., DNA and RNA, contain phosphorus in the form of phosphate groups. These phosphate groups are essential for the stability and structure of nucleic acids.
Phosphorus in Cell Membranes:
Phospholipids are a major component of cell membranes. They consist of a hydrophilic head and a hydrophobic tail, which are composed of glycerol, fatty acids, and phosphate groups. The phosphate groups provide a polar and charged region, which makes the phospholipids amphipathic and enables them to form a bilayer in water.
Phosphorus in Proteins:
Phosphorus is also present in certain proteins, such as casein in milk and phosphoproteins in egg yolk. In these proteins, phosphate groups are attached to specific amino acid residues, such as serine, threonine, and tyrosine, through a covalent bond. These phosphoproteins have important roles in various cellular functions, such as signal transduction and enzyme regulation.
Conclusion:
In conclusion, phosphorus is an essential element required for the growth and development of living organisms. It is present in various cellular components such as nucleic acids, cell membranes, and proteins, including cell proteins. Therefore, option (C) is the incorrect statement.
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