Ligase
Correct. The mRNA transcibed from the DNA in the nucleus has both exons and introns; the introns are taken out and the exons are left in. The mended exons exit the nucleus and the introns stay in the nucleus. Only the exons are translated at the ribosomes. (In Eukaryotic cells only)
Restriction enzymes cuts out a specific short nucleotide sequence while as the process of ligation, DNA ligase joins them together. So ligase can be considered the reverse of the restriction enzyme process as it joins DNA fragments together instead of cutting them out.
The introns are cut out in the spliceisome and the exon portions are spliced together. A poly adenine tail is added to one end and a modified guanine cap added to the other end. Then the mRNA leaves the cell nucleus and heads for the cytoplasm and a ribosome.
Yes, exons are not removed during the process of splicing in gene expression. Instead, introns are removed and exons are joined together to form the mature mRNA molecule.
The enzyme RNA polymerase transcribes DNA. This enzyme initiates transcription, joins the RNA nucleotides together, and terminates.
General term.DNA polymerase.-----------------------
Phosphorylase is an enzyme which joins with Glucose-1-phosphate together to make larger starch molecules. it is an example of synthesis (a joing together enzyme)
Ligase is used to join DNA strands together
Exons
DNA Polymerase
The EGFR gene contains 28 exons.
Correct. The mRNA transcibed from the DNA in the nucleus has both exons and introns; the introns are taken out and the exons are left in. The mended exons exit the nucleus and the introns stay in the nucleus. Only the exons are translated at the ribosomes. (In Eukaryotic cells only)
The active site is the specific region of an enzyme that binds to the substrate molecule. This is where the chemical reaction catalyzed by the enzyme takes place. The active site is typically a pocket or groove on the enzyme's surface that is complementary in shape to the substrate molecule.
Exons are important because they contain the genetic information needed to code for proteins. During gene expression, exons are transcribed into mRNA which is then translated into proteins. Mutations or changes in exons can alter the sequence of amino acids in a protein, leading to functional changes or diseases.
Exons, after the introns have been cleaved.
Exons are the DNA sequences that code for proteins. Introns are involved however they dont carry the genetic information that exons carry, the variation provides for revolutionary flexibility allowing cells to shuffle exons between genes to make new ones. A great way to remember which is which is Exons (sounds like Executives, like in a business) have the information and introns (sounds like the interns of a business) dont know anything; exons and inrons, executives and interns. Easy huh?
RNA segments joined together by spliceosomes are called exons. Spliceosomes remove introns from pre-mRNA molecules and ligate exons together to produce a mature mRNA transcript that can be translated into a protein. This process is known as RNA splicing.