Structures of Cells

Cell types include prokaryotes, which encompass all bacteria, and eukary-otes, which are cells in all living cells except bacteria and viruses. Bacterial cells are molecules surrounded by a semipermeable membrane and which in turn is covered by a porous cell wall. The protoplasm in the membrane contains nuclear material that is not bounded by any other material separating it from the protoplasm. Organelles are complex and well-defined internal structures surrounded by membranes. Characteristic organelles comprise cell nucleus, mitochondria, and ribosome. Fig. 2.1 shows a diagram of a cell structure of a bacterium.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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