Sample Collection Letter Dental

(ACIDORIBONUCLEICO (ARN)

genetic material of certain viruses (virus RNA) and in cellular organisms, a molecule that directs the intermediate stages of protein synthesis. In RNA viruses, this molecule runs two processes: protein synthesis (production of proteins that form the capsule of the virus) and replication (the process by which RNA is a copy of itself). In cellular organisms is another type of genetic material called deoxyribonucleic acid (DNA), which carries the information that determines the structure of proteins. But DNA can not act alone, and RNA uses to transfer this information vital for protein synthesis (production of proteins needed by the cell for its activities and its development.)
As the DNA, RNA consists of a chain of chemical compounds called nucleotides. Each is composed of a sugar molecule called ribose, a phosphate group and one of four possible compounds called nitrogenous bases: adenine, guanine, cytosine and uracil. These compounds bind as in the deoxyribonucleic acid (DNA). RNA differs chemically from DNA by two things: the sugar molecule RNA contains a missing oxygen atom in DNA, and RNA contains the base uracil instead of thymine in DNA. ARNCELULAR

In cellular organisms, RNA is a chain of single-stranded polynucleotide, ie, a series of linked nucleotides. There are three types of RNA: ribosomal RNA (rRNA) is found in cellular ribosomes (specialized structures located at the points of protein synthesis), transfer RNA (tRNA) carries amino acids to ribosomes for incorporation into proteins, the messenger RNA (mRNA) carries a copy of the genetic code obtained from the base sequence of cellular DNA. This copy specifies the amino acid sequence of proteins. The three types of RNA are formed as needed, using as a template specific sections of the cellular DNA. Í vRNA
RICO
Some viruses have double stranded RNA formed by two complementary polynucleotide chains. In these viruses, RNA replication in the host cell follows the same pattern of DNA replication. Each new RNA molecule is a polynucleotide chain from a previous one. Each one of the bases of the nucleotide chain is coupled with another nucleotide base complementary RNA: adenine with uracil and guanine with cytosine. There are two types of viruses with single-stranded RNA. One of them, polio, polio virus causing human (see Enterovirus), enters the host cell, and synthesizes an RNA strand complementary to transform the single molecule in two. During replication the two strands are separated, but only recently formed attracts nucleotides complementary bases. Therefore, the polynucleotide chain formed as a result of replication is exactly like the original.
The other type, which includes the so-called retrovirus, includes the human immunodeficiency virus (HIV) that causes AIDS, and other viruses that cause tumors. After entering the host cell, the retrovirus is a strand of DNA complementary to its own RNA using the nucleotides of the cell. This new strand of DNA replicates and forms a double helix that is incorporated into the host cell's chromosomes, which in turn is replicated along with cellular DNA. While in the host cell, the viral DNA synthesized from RNA produces single-stranded RNA virus that leave the cell and invade others.

The information contained in the nucleotide sequence of DNA could produce proteins, but the DNA is in the nucleus and proteins are synthesized on ribosomes, which are located in the cytoplasm. The broker was found to be an mRNA.
The stages are: