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Eukaryotic genes contain all the information required to make the all proteins that all the cells in the organism will need. However, mRNA in cells only copies the region of DNA (gene) that is necessary for that cell. Hence, selectively copying DNA, leaving out junk DNA, the introns, and only copying necessary regions of the DNA, the exons.
Further explanation:
In DNA, there are many genes (segments of DNA). Some of these genes may be useful while others may not be useful. For example, for a cell found in the mouth, the gene that codes for insulin is not necessary, but the gene that codes for amylase is necessary. As the DNA in all of our cells are the same, this results in unnecessary genes known as introns. These introns will not be copied by the mRNA. Only the exons (necessary genes) will be copied.
Thus resulting in a shorter mRNA as compared to DNA.
Wiki User
∙ 12y ago
Wiki User
∙ 10y agoThe introns must be removed by the spliceosome
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What are the functions of the ribosomes in mitochondria?
The ribosomes in mitochondria have the same functions as ribosomes elsewhere.Mitochondria contain DNA in the form of circular molecules. Along this DNA there are 37 genes, of which 13 hold the code for polypeptide chains that contribute to the synthesis of proteins in the inner membrane of the mitochondrion, which is the part of the mitochondrion at which ATP is synthesized.These 13 genes are transcribed just as nuclear genes are in eukaryotic cells, and the messenger RNA (mRNA) molecules are translated at mitochondrial ribosomes.The ribosomes are smaller than either prokaryotic or eukaryotic ones, having a sedimentation rate of 55S (Svedberg units) as against 70S for prokaryotic ribosomes and 80S for eukaryotic ones.
How long is the mRNA that codes for the protein with 250 amino acid?
The coding part of the mRNA would be 750 bases long. However, the mRNA would be much longer than this in real life as there would be both a 3 prime and 5 prime untranslated region. The lenght of the untranslated regions varied depending on the protein in question, the organism it is from and even the location in which it is produced in that organism! In summary, it is impossible to answer this question.
Can single mRNA be read more than once?
Idont know
Does splicing occur in prokaryotes?
in prokaryotes only self spilicing and tRNA splicing are present there is no splicosomes are present.
Which one pair of genes is the weakest?
No genes are "weaker" than any others, they are all made of the same stuff.
What are the functions of the ribosomes in mitochondria?
The ribosomes in mitochondria have the same functions as ribosomes elsewhere.Mitochondria contain DNA in the form of circular molecules. Along this DNA there are 37 genes, of which 13 hold the code for polypeptide chains that contribute to the synthesis of proteins in the inner membrane of the mitochondrion, which is the part of the mitochondrion at which ATP is synthesized.These 13 genes are transcribed just as nuclear genes are in eukaryotic cells, and the messenger RNA (mRNA) molecules are translated at mitochondrial ribosomes.The ribosomes are smaller than either prokaryotic or eukaryotic ones, having a sedimentation rate of 55S (Svedberg units) as against 70S for prokaryotic ribosomes and 80S for eukaryotic ones.
Why is the bird ont the right more likely to pass on its genes than the bird on the left?
The bird on the right is more likely to pass on its genes because it has a longer beak so it can get more food and eat more making it more likely to pass on its genes.
Is it true that you are more than the sum of your genes?
The answer is No you are not more then your genes.
How long is the mRNA that codes for the protein with 250 amino acid?
The coding part of the mRNA would be 750 bases long. However, the mRNA would be much longer than this in real life as there would be both a 3 prime and 5 prime untranslated region. The lenght of the untranslated regions varied depending on the protein in question, the organism it is from and even the location in which it is produced in that organism! In summary, it is impossible to answer this question.
Can a single mRNA be more than once?
Idont know
How do people live longer than 100 years?
they get lucky, usually it has something to do with were they grew up and how healthy they have kept themselves, sometimes it can also be a abnormality in genes
What organelle receives instructions from the hereditary material on how when and in what order to make proteins in a cell?
messenger RNA (mRNA) is transcripted from DNA. mRNA takes the genetic information on how to synthesis a protein out of the nucleus to a ribosome (composed of ribosomal RNA). mRNA is read (translated) by ribosome. transfer RNA (tRNA) brings in amino acids and the ribosome connects them together to make proteins. it's a little more technical than this, though.
Can single mRNA be read more than once?
Idont know
Why is protein different in prokaryotes and eukaryotes?
In prokaryotes, DNA is stored in the cytoplasm. also prokaryotes have no nucleus In prokaryotes, transcription and translation happen at the same time.
What would most likely happen if an error occurred when RNA was receiving coding information?
The tRNA carries the amino acid on it into the ribosome where the amino acid is transferred on to a growing protein chain. If the wrong amino acid is on the tRNA, and the ribosome accepts the tRNA with the error and incorporates the amino acid into the protein at a mRNA codon that matches the tRNA, there will be an error in the protein being synthesized. It may not matter, or it may cause the protein to not be able to carry out its normal function. Conceivably, more than one protein can contain an error depending on what mRNA's are being translated.
When you compare an mRNA product of an unidentified organism with the gene you discover that the mRNA is much smaller than the actual gene coding for it Is the organism a bacteria or eukaryote why?
The mRNA product is shorter than the gene coding for it as a result of splicing. Therefore the organism in question is likely to be a Eukaryote, as Prokaryotes rarely undergo splicing.
Are there more chromosome than genes?
No. Humans have 46 chromosomes " beaded " with about 25,000 genes.
