Chlorophyll Structure: The Central Atom
Chlorophyll, the pigment essential for photosynthesis, has a characteristic molecular structure based on a large organic ring system.
The Porphyrin Ring Core
The fundamental structure of chlorophyll contains a porphyrin ring. This ring is constructed from four interconnected pyrrole groups.
Central Metal Ion Identification
The question requires identifying the element located at the center of this porphyrin ring within the chlorophyll molecule. The porphyrin structure characteristically binds a specific metal ion in its central cavity.
Research and structural elucidation confirm that Magnesium (Mg2+) is the metal ion chelated at the center of the chlorophyll porphyrin ring. This central Magnesium ion plays a critical role in chlorophyll's function of absorbing light energy during photosynthesis.
Options such as Copper, Zinc, or Sodium bicarbonate do not represent the central element of the chlorophyll molecule.
Therefore, chlorophyll's structure is defined by a porphyrin ring containing Magnesium at its center.
Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
