Archive for the ‘FAQ’ Category
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12.09.09
DNA Sequencing
DNA sequencing, using the enzymatic extension reaction, makes use of the chemical difference between normal deoxyribonucleotide and dideoxyribonucleotide. Deoxyribonucleotide contain a hydroxyl group in position 3 of the sugar ring, and DNA polymerase conjoin the phosphate of the next nucleotide to the hydroxyl end.
A dideoxyribonucleotide can be added to a growing chain but does not contain a hydroxyl group at position 3 so no further nucleotides can be added. Addition of a dideoxy nucleotide stops DNA synthesis.
The DNA to be sequenced is denatured in a tube.
Watch video to learn more…
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12.05.09
DNA Structure
Hello this is Dr. Sullivan, talking about Anatomy and Physiology I at Bucks County Community College.
In this particular video, discusses DNA structure. (We’re in Unit 4 right now which is entitled DNA and Protein Synthesis.) In this video we’ll just gonna talk about DNA Structure so we can understand how protein synthesis takes place due to the structure of DNA.
In this image that I have for you right here, you can see that we illustrated the coiling effect a molecule of DNA as it is bound together by structures called histones into a spherical structure called a nucleosome which is a combination of DNA and the histones that are holding it together. Those spherical structures are going to coil themselves into what’s called chromatin. Chromatin is genetic material and we gonna see when we talk about cell division how chromatin will eventually coil itself up….
Watch video to learn more…
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Ah life… a sunny day, a simple friend, and a complex biological story.
The Human Genome Project is a way of exploring our molecular selves. Almost all of our cells, the muscle cells that let us smile, the brain cell that perceive the humor and thinks, the cells of our eyes that take it all in, contain a complete set of all our genes – the genome.
If we could journey inside our self into a cell, we could see 23 pairs of chromosomes packed into a nucleus. Each chromosome contains a long chain of DNA. If all the chromosomes would unwound, the DNA in just one of our cells would stretch six feet long.
Watch video to learn more…
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Fifty years ago, two scientist in England bolted together some grass part and discovered the secret of life.
“These were unlikely characters to be working on such an important problem.”
The directions for human being are written in code, 3 billion letters long. These instructions tell our body how to live, how to grow, how to die. Researcher call this code, the sequence.
Host: Welcome to the secrets of the sequence. I’m Lucky Severson.
Imagine, you are tipping back in mirror in English pub when two rather wild looking character announced loudly that they have discovered the secret of life. What would you think?
Watch video to learn more…
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12.05.09
Biology: RNA
Part 5 – Ribonucleic Acid
Section A: What is RNA?
RNA is important in the direction of cellular activities. It’s also a link in the all important synthesis chain you see on your screen right now (DNA –> RNA –> Protein). RNA is needed to make each protein molecule in a cell and you now understand how important protein is for life.
You are about to learn how RNA is made from DNA. But before we get to that, we need to know what RNA is, and we can learn that by discussing the differences between RNA and DNA. Does anybody know?
I know, RNA has a ribose sugar whereas DNA has a deoxyribose sugar. DNA has the prefix deoxy because it has one less oxygen molecule on its ribose sugar…
Watch video to learn more…
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With computer animation, we can enter the cell to view this remarkable system at work.
After entering the heart of the cell, we see the tightly wind strands of DNA, store houses for the instructions necessary to build every protein in an organism. In a process known as transcription, molecular machine first unwinds a section of the DNA helix to expose the genetic instructions needed to assemble a specific protein molecule. Another machine then copies this instructions to form a molecule known as messenger RNA (mRNA).
Watch video to learn more…