Darwin

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Submitted By ghostlordz
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19
MENGAPA KEKEBALAN BAKTERI TERHADAP ANTIBIOTIK BUKANLAH CONTOH PERISTIWA EVOLUSI?

Satu konsep biologi yang dicoba-sajikan sebagai bukti teori evolusi oleh para evolusionis adalah kekebalan atau daya tahan bakteri terhadap antibiotik. Banyak sumber evolusionis menyebutkan bahwa kekebalan terhadap antibiotik adalah sebuah contoh perkembangan makhluk hidup melalui mutasi yang menguntungkan. Hal serupa juga dikatakan tentang serangga yang menjadi kebal terhadap insektisida seperti DDT.
Akan tetapi, kaum evolusionis pun salah dalam hal ini.
Antibiotik adalah “molekul pembunuh” yang dihasilkan mikroorganisme untuk melawan mikroorganisme lain. Antibiotik pertama adalah penisilin, yang ditemukan oleh Alexander Flemming pada 1928. Flemming menyadari bahwa jamur (seringkali ditemukan seperti bubuk atau benang-benang di permukaan bahan organik sudah lama – penerj.) menghasilkan molekul yang mematikan bakteri Staphylococcus, dan penemuan ini merupakan titik balik dalam dunia obat-obatan. Antibiotik yang diambil dari berbagai organisme digunakan untuk melawan bakteri, dan berhasil.
Tidak lama kemudian, hal baru ditemukan. Seiring dengan waktu, bakteri mengembangkan kekebalan terhadap antibiotik. Mekanisme kerjanya adalah sebagai berikut: sebagian besar bakteri yang diberi antibiotik akan mati, tetapi sebagian lain yang tidak terpengaruh oleh antibiotik tersebut, akan dengan cepat berkembang biak dan membentuk populasi yang sama dengan yang sebelumnya. Sehingga, seluruh populasi menjadi kebal terhadap antibiotik.
Para evolusionis menampilkan hal ini sebagai “evolusi bakteri dengan cara beradaptasi terhadap lingkungan”.
Akan tetapi, kenyataan sebenarnya jauh berbeda dengan penafsiran dangkal ini. Salah seorang ilmuwan yang telah melakukan penelitian mendalam di bidang ini adalah ahli biofisika Israel bernama Lee Spetner, yang juga dikenal dengan bukunya Not by Chance…...

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