Bagian Sel dan Fungsinya

Bagian-bagian Sel dan Fungsinya:

A.  Cair/Sitosol

1.     Sitoplasma

Sitoplasma merupakan cairan sel yang bersifat koloid (tidak padat dan tidak cair), jernih, dan homogen yang di dalamnya terkandung berbagai senyawa kimia yang berguna bagi aktivitas sel  yang terdapat di dalam sel, kecuali di organel sel.

2.     Nukleoplasma

Nukleoplasma merupakan cairan inti yang merupakan zat yang tersusun dari protein yang berfungsi sebagai tempat metabolisme dan organel di inti sel.

B.  Padat/Organel

1.     Vakuola

Berfungsi sebagai tempat menyimpan hasil atau sisa meetabolisme seperti minyak astiri.

a.     Vakuola Kontraktil

Berfungsi sebagai osmoregulator yaitu pengatur nilai osmotik sel atau ekskresi.

b.     Vakuola Nonkontraktil atau Vakuola Makanan

Berfungsi  mencernna makanan dan mengedarkan hasil pencernaan.

2.     Sentriol

Berfungsi untuk membentuk bidang kutub pada saat pembelahan sel dan mensintesis mikrotubul silia.

3.     Ribosom

Berfungsi sebagai tempat sintesis protein.

4.     Mitokondria

Berfungsi sebagai tempat respirasi sel untuk menghasilkan energi melalui metabolisme aerob.

5.     Badan Golgi atau Aparatus Golgi

Berfungsi untuk menyimpan hasil sekresi sel, protein, dan lemak.

6.     Nukleus

Berfungsi dalam mengatur semua proses yang terjadi di dalamm sel.

7.     Nukleolus

Berfungsi mensintesis RNA atau ribosom.

8.     Benang Kromatin

Berfungsi sebagai tempat penghasil gen yang membawa sifat keturunan.

9.     Badab Mikro

a.     Peroksisom

Menghasilkan enzim katalase yang berfungsi memecah hidrogen peroksida menjadi air (dari racun menjadi air yang bersifat netral).

b.     Glioksisom

Menghasilkan enzim yang berfungsi memecah lemak menjadi gula untuk menghasilkan energi yang dapat digunakan dalam proses perkecambahan.

10.  Retikulum Endoplasma (RE)

a.     RE Kasar

Berfungsi dalam sintesis protein karena adanya aktivitas ribosom.

b.     RE Halus

Berfungsi dalam sintesis dan transportasi glikogen, lemak, dan steroid.

11.  Sitoskeleton

Berfungsi membentuk rangka sel.

a.     Mikro Filamen

Berfungsi membentuk permukaan sel dan berperan dalam pergerakan sel.

b.     Mikro Tubulus

Berfungsi mengarahkan gerakan komponen-komponen sel, mempertahankan bentuk sel,  dan membantu pembelahan sel secara mitosis.

c.      Filamen Antara

Berfungsi memberi kekuatan mekanis pada sel, sehingga sel tahan terhadap tekanan dan pegangan  yang terjadi di dinding sel.

12.  Plastida

Berfungsi sebagai tempat menyimpan amilum, protein, dan lemak.

a.     Kloroplas

Mengandung pigmen klorofil sehingga berwarna hijau.

b.     Kromoplas

Mengandung pigmen karotenoid sehingga berwarna jingga atau kuning keemasan.

c.      Leukoplas

Tidak mengandung pigmen sehingga tidak berwarna.

13.  Lisosom

Berfungsi sebagai alat pencernaan intraseluler dan pertahanan sel.

Teks Narrative Terbaru

The Bear and the Two Travellers

            Once, thee were two man were travelling together. They were best friends and they always did everything together. On the way, they suddenly met Bear. They felt scared and tired to save themselves.

            Suddenly, their friendship was gone. One of them individually climbed up quicly into a tree and covered himself in the branches. The other one fell flat on the ground because he saw that he would be attacked. The man held his breath and pretended appearance of death. He held his breath as long as he could because he knew that Bear would not attack dead people. The Bear came up and felt with his nose. Bear smelt him all over. The Bear soon left him, because Bear would not touch a dead body.

            When Bear was quite gone, the other man got down from the tree and humorously asked his friend about what the Bear had whispered in his ear. Then, his friend said that the Bear gave him advice. The other man then asked what the Bear adviced him. Then, his friend said that the Bear advised him not to travel with someone who leaves his friend at the approach of danger.

Queeen of Arabia and Three Sheiks

            Maura, who like to be thought of as the most beautiful and powerful queen of Arabia, had many suitors. One by one she discarded them, until her list was reduced to just three sheiks. The three sheiks were all euqally young and handsome. They were also rich and strong. It was very hard to decide who would be the best of them.

            One evening, Maura disguised her self and went to the camp of the three sheiks. As they were about to have dinner, Maura asked them for something to eat. The first gave her some left over food. The second sheiks gave her some unappetizing camel’s tail. The third sheiks, who was called Hakim, offered her some of the most tender and tasty meat. After dinner, the disguised queen left the sheik’s camp.

            The following day, the queen invited the three sheiks to dinner at the palace. She ordered her servant to give each one exactly what they had given her the evening before. Hakim, who received a plate of delicious meat, refused to eat it if the other two sheiks could not share it with him.

            This sheiks Hakim’s act finally convinced Queen Maura thet he was the man for her. “Without question, Hakim is the most generous of you” she announced her choice to the sheiks. “So it is Hakim I will marry”.

The Legend of Lake Batur

            A long time ago, there lived on the island of Bali a giant like creature named Kbo Lwo. The people of Bali used to say that Kbo Lwo was everything, a destroyer as well as a creator. He was satisfied with the meal, but this meant for the Balinese people enough food for a thousand man.

            Difficulties arose for the first timethe barns were almost empty and the new harvest was still a long way off. This made Kbo Lwo wild with great anger. In his hunger, he destroyed all the houses and even all the temples. It made the Balinese turn to rage. So, they came together to plan steps to oppose this powerful giant by using his stupidity.

            They asked Kbo Lwo to build them a very deep well, and rebuild all the houses and temples he had destroyed. After they fed Kbo Lwo, he began to dig a deep hole. One day he had eaten too much, he fell a sleep in the hole. The oldest man in the village gave a sign, and the villagers began to throw the limestone they had collected before into the hole. The limestone made the water inside the hole boiling. Kbo Lwo was buried alive. Then the water in the well rose higher and higher until at last it over flowed and formed Lake Batur. The mound of earth dug from the well by Kbo Lwo is known as Mount Batur.

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