The inorganic molecule that is a cofactor for many enzymes, including DNA polymerase, and is essential for nerve function is: MCQ with Answer and Explanation
The inorganic molecule that is a cofactor for many enzymes, including DNA polymerase, and is essential for nerve function is:
A. Zinc
B. Magnesium
C. Calcium
D. Iron
Answer: Option B
Solution (By JKSSB Mock Tests)
Magnesium (Mg²⁺) is a crucial cofactor for ATP-utilizing enzymes, including DNA polymerase, and is essential for nucleic acid structure, nerve impulse transmission, and muscle contraction. Iron is for hemoglobin, zinc for many enzymes and transcription factors, calcium for bones and signaling. Magnesium is the central atom in chlorophyll.
Explanation:
Gross Primary Productivity (GPP) is the total rate of photosynthesis, or the total amount of organic matter (biomass) produced by producers (plants) per unit area per unit time, including the organic matter used in respiration. Net Primary Productivity (NPP) is GPP minus the energy used by the plants for respiration (NPP = GPP - R).
Explanation:
Robert Hooke observed thin slices of cork under a microscope he designed and saw honeycomb-like compartments which he termed 'cells' in his 1665 book 'Micrographia'. Leeuwenhoek discovered living cells (bacteria, protozoa). Brown discovered the nucleus (1831), and Virchow proposed that all cells arise from pre-existing cells (1855). Hooke's cells were dead, empty cell walls of cork.
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