The technique used to measure the concentration of a solution based on light absorption is:
A. Chromatography
B. Centrifugation
C. Electrophoresis
D. Spectrophotometry
Answer: Option D
Solution (By JKExamLibrary)
Spectrophotometry measures the absorbance of light by a solution at a specific wavelength, which is proportional to the concentration of the absorbing substance (Beer-Lambert law).
Explanation:
Frederick Sanger determined the amino acid sequence of insulin in 1955, showing proteins have a specific sequence. Banting and Best isolated insulin, Hodgkin determined its 3D structure.
Explanation:
Mitosis produces two genetically identical diploid daughter cells (clones) essential for growth, repair, and asexual reproduction. Meiosis involves pairing (synapsis) and crossing over during prophase I, and produces four genetically diverse haploid cells (gametes). The conservation of chromosome number and genetic identity is a hallmark of mitosis.
Explanation:
Hydra, a freshwater cnidarian, has extraordinary regenerative ability; even small fragments can regenerate a complete organism. This is due to its high proportion of stem cells. Planarians also show remarkable regeneration. Earthworms can regenerate some posterior segments, but not as extensively as Hydra or Planaria.
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