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Essay heading: A.I.D.S
Essay specific features
Issue: Science
Written by:
Date added: April 17, 2003
No of pages / words: 4 / 1062
Was viewed: 0 times
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HIV DNA is called a provirus. Transcription - The viral DNA in the nucleus separates and creates messenger RNA (mRNA), using the cell's own enzymes. The mRNA contains the instructions for making new viral proteins. Translation - The mRNA is carried back out of the nucleus by the cell's enzymes...
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The virus then uses the cell's natural protein-making mechanisms to make long chains of viral proteins and enzymes. Assembly - RNA and viral enzymes gather at the edge of the cell. An enzyme, called protease, cuts the polypeptides into viral proteins. Budding - New HIV virus particles pinch out from the cell membrane and break away with a piece of the cell membrane surrounding them...
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And lastly there are vacuoles which have a variety of storage functions. The plant cell is similar in most ways. The only really big differences between the plant cell and the animal cell are as follows...
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Introns And Exons
The genes are split with coding regions, called exons, short for expressed regions; in between the exons the non-coding region called introns exist. Before the translation of mRNA the introns must be spliced off...
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nucleotide triplets:
In order for a student to score fifteen points, three or more points must have been from the discussion of changes in the code. A student was given one point for recognizing that an addition or deletion may alter a large portion of the resulting polypeptide...
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Protein Synthesis
Protein synthesis is the process by which genetic information from the DNA stored in the nucleus is transferred to the ribosomes where it is used to arrange amino acids into proteins...
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Recently, biologists have found that rRNA also catalyses some of the reactions in protein synthesis. Most of the enzymes at work are the proteins that are found in the ribosome, but rRNA itself also acts as an enzyme...
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The nucleus Brain of the cell
This is where the DNA resides. The most prominent structure in the nucleus is the nucleolus which produces ribosomal RNA or rRNA. Multicellular organisms consist of many cells that are specialized for one particular function and carry it out very efficiently...
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