During which phase of the cell cycle does the centrosome duplicate?
A. G2 phase
B. M phase
C. G1 phase
D. S phase
Answer: Option D
Solution (By JKSSB Mock Tests)
The centrosome, which contains two centrioles, duplicates during the S phase of the cell cycle, concurrent with DNA replication. This ensures that by the time the cell enters mitosis, it has two fully formed centrosomes to organize the mitotic spindle. G1 is for growth, G2 is for preparation for M phase, and M phase is for actual division.
Explanation:
Immunohistochemistry (IHC) uses enzyme- or fluorophore-linked antibodies to visualize specific antigens in tissue sections. ELISA is for liquid samples, Western blot for membrane, flow cytometry for cells.
Explanation:
Phosphorus is part of the phosphate backbone of DNA/RNA and the high-energy bonds of ATP. Nitrogen is in bases and amino acids, iron in hemoglobin, sulfur in some amino acids. Phosphorus is essential for energy transfer and genetic material.
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