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Sunday, 17 December 2017

Which of the following is present in a prokaryotic cell?

  By GK Planet Team       Sunday, 17 December 2017
Q. Which of the following is present in a Prokaryotic Cell?

A. ER
B. Nuclear envelope
C. Ribosome
D. Chloroplast
E. Mitochondrion


Answer:Ribosome

The cell (from Latin cella, meaning "small room") is the basic structural, functional, and biological unit of all known living organisms. A cell is the smallest unit of life that can replicate independently, and cells are often called the "building blocks of life". The study of cells is called cell biology.

There are two major types of cells: prokaryotes and eukaryotes. Eukaryotic cells, whose name derives from the Greek eu, meaning “good,” and karyon, “kernel” or “nucleus,” have a nucleus and membrane-bound organelles.

Prokaryotic cells were the first form of life on Earth, characterised by having vital biological processes including cell signalingand being self-sustaining. They are simpler and smaller than eukaryotic cells, and lack membrane-bound organelles such as the nucleus. Prokaryotes include two of the domains of life, bacteria and archaea. The DNA of a prokaryotic cell consists of a single chromosome that is in direct contact with the cytoplasm. The nuclear region in the cytoplasm is called the nucleoid. Most prokaryotes are the smallest of all organisms ranging from 0.5 to 2.0 ┬Ám in diameter.

Prokaryotes are cells which do not have a cell nucleus, and lack other things eukaryotes (cells with a true nucleus) have. Prokaryotes do not have membranes inside the cell. This means that there are no vacuoles, Golgi apparatus, endoplasmic reticula or other organelles inside the cell. However, they do have ribosomes, though of a simpler kind than eukaryotes. Eukaryote cells include organelles which were once free-living prokaryotes.
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