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16 August 2026

Biological clock research

This topic provides foundational scientific context on biological rhythms that can be used to explain health-related issues or technological applications in biotechnology, though it is not a specific policy or event that would be asked directly.

1 min read 1 questions 2 prelims

Notes

  • The human biological clock is a network of genes and proteins operating in a roughly 24-hour cycle.
  • The suprachiasmatic nucleus (SCN), a cluster of neurons in the hypothalamus, acts as the central biological clock.
  • Mechanism: Genes in SCN neurons produce proteins; once these proteins reach a threshold, they suppress the genes that created them; as proteins degrade, genes reactivate, restarting the cycle.
  • The SCN clock is synchronized with the external environment via light-sensitive cells in the retina.
  • Retinal cells contain the pigment melanopsin, which is highly sensitive to blue-light-rich daylight.
  • Daylight exposure triggers melanopsin, which sends signals to the SCN to adjust the molecular clock machinery.

Questions

  1. Explain the mechanism of the human biological clock and discuss how external environmental cues, particularly light, regulate its synchronization. 150 words
    Attempt this — 150 words in 8 min
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Prelims

  1. Which part of the human brain acts as the primary center for the biological clock?

  2. What is the role of melanopsin in the human body regarding the biological clock?

Syllabus

Topics

Sources

250words.in · https://250words.in/daily/2026-08-16/biological-clock-research