Okuma AnlamaSoru #11480
Epigenetics: Beyond the Genetic Code
For decades following the discovery of the DNA double helix, biological dogma dictated that an organism's hereditary destiny was rigidly determined by its static genetic code. However, the burgeoning discipline of epigenetics has upended this deterministic paradigm. Epigenetics investigates heritable changes in gene expression that do not involve alterations to the underlying DNA sequence. Instead, chemical modifications—such as DNA methylation and histone acetylation—act as molecular switches, turning specific genes on or off in response to environmental stimuli. Factors including nutritional intake, chronic psychosocial stress, exposure to airborne pollutants, and physical exercise can leave lasting epigenetic marks. Remarkably, recent mammalian research suggests that certain environmentally induced epigenetic alterations can be transmitted across generations, implying that the lifestyle choices of ancestors may influence the metabolic and psychological health of their descendants. The author's primary attitude toward the field of epigenetics is best described as ----.
- A)fascinated by its transformative implications for genetics and medicine
- B)deeply skeptical of all published epigenetic experiments
- C)hostile toward researchers investigating molecular switches
- D)indifferent and bored by recent cellular biochemistry papers
- E)alarmed by the dangers of histone acetylation drugs
Cevabı ve çözümü göster
Doğru cevap: A) fascinated by its transformative implications for genetics and medicine
Çözüm: Yazar epigenetiği "burgeoning discipline", etkisini "upended this deterministic paradigm" ve nesiller arası aktarımını "remarkably" diyerek ilgi ve hayranlıkla ele alır. Doğru cevap A'dır.