Monday, August 12, 2013

Pengertian Sitoplasma – Fungsi dan Susunan

Sitoplasma merupakan tempat berlangsungnya reaksi biokimiawi dalam metabolisme sel. Sitoplasma tersusun atas koloid yang berisi nutrien, inklusi, ribosom, enzim, dan ADN. Inklusi merupakan suatu kantong yang dibatasi membran serupa dengan membran sitoplasma yang berfungsi sebagai tempat penyimpanan hasil metabolisme. Terdapat beberapa jenis inklusi, misalnya inklusi yang berisi glikogen, volutin (suatu bentuk fosfat anorganik), dan lemak. Ribosom merupakan tempat untuk sintesa protein.

Ribosom pada bakteri ukurannya lebih kecil daripada ribosom sel eukariotik dan tipe ARN-ribosomnya juga berbeda. Kerja ribosom bakteri lebih mudah dihambat oleh antibiotik dibandingkan ribosom sel eukariotik. ADN bakteri merupakan materi genetik yang berbentuk sirkuler, terdiri dari dua utas polinukleotida yang berpilin, terletak di tengah sel yang disebut daerah nukleus/daerah inti yang tidak dibatasi membran inti.

Materi Referensi:
Budiati, Herni. 2009. Biologi untuk SMA dan MA Kelas X. Jakarta: Pusat Perbukuan, Departemen Pendidikan Nasional.


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