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Facts about Laser

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May 15, 2014

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Cell Cycle part 2

April 14, 2015

Now the cell should have double the amount DNA after interphase. The next phase is m-phase. The m-phase consists of mitosis (separation of 1 cell nucleus to 2 nuclei) and cytokinesis (cytoplasmic division or whole cell division). There are 4 steps in mitosis. To help understand this concept, I will explain the structure of a chromosome. A chromosome is formed during mitosis to help in nuclear division. A chromosome has two sides, each side is a copy of the other(interphase), therefore, each side separates into its own nucleus so the new cell has an exact copy of the parent cell's DNA. The first phase is called prophase. During prophase, the chromosomes become visible from chromatin and the nucleolus disappears. The next phase is called metaphase. Here, the chromosomes line up in the center and fibers called spindle fiber attach to the chromosomes centromere from both sides. The next step, anaphase, the spindle fibers pull on the chromosomes where each copy is separated to either s...

If graphite can conduct electricity, why not diamond?

December 13, 2012

As graphite is an allotrope of carbon it conducts electricity as it has delocalized electrons. Unlike diamonds they don't have delocalized electrons. So the electrons in their shell become a covalent bond making no electrons free to move so there is no flow of electricity in Diamond.

Cell cycle (mitosis) Part 1

April 08, 2015

Our cells in our body go through cellular replication. There are many steps that occur before we get two cells from one cell. Every normal person would have 23 pairs of chromosomes. The chromosomes contain genetic information that is vital for a cell to perform its function. Therefore, a cell needs to go through steps that helps it to pass its exact copy of DNA to its offspring. First, the cell goes through a phase of growth and maturity called the G1(growth) phase. Then, the cell goes through the S phase or the synthesis phase. The S phase is when the cells DNA gets duplicated. This process takes time for completion. The DNA, first, needs to split. The enzyme, Helicase, separates the DNA through the process of hydrolysis. This literally means "to split by water". Each nitrogenous base share one water molecule to stick together. This enzyme helps adds another water molecule, giving each nitrogenous base its own water molecule, as a result, the DNA splits in halves. Next t...