1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
puteri [66]
3 years ago
6

In which cellular organelle do the three posttranscriptional modifications often seen in the maturation of mrna in eukaryotes oc

cur?
Biology
1 answer:
Mamont248 [21]3 years ago
3 0

Answer:

Nucleus

Explanation:

Eukaryotic RNAs are synthesized in the form of precursors that will have to undergo a modification process in order to be functional. Prokaryotic mRNAs do not need to be modified after being synthesized and are linear with respect to the gene from which they were synthesized. That is, they are completely complementary. As for the prokaryotic rRNA and tRNA, the modifications they suffer are simple because they have to do with the cuts that the long precursor will suffer in which both species are included. However, eukaryotic mRNA, rRNA and tRNA, which are synthesized in the cell nucleus and nucleolus and subsequently used in the cytoplasm, need to undergo much more complex modification processes, not only to be functional but to be able to pass through the small nuclear pores to the cytoplasm. The objective of this conference is precisely to describe these post-transcriptional modification processes.

Modification at the 5 'or Cap 5' end

The 5 'end of the mRNA is modified in the eukaryotic nucleus (but not in the mitochondria or chloroplasts). Modification reactions are probably common in all eukaryotes. Transcription begins with a nucleoside triphosphate (almost always a purine, A or G). The first nucleotide retains its 5 'triphosphate group and forms the usual phosphodiester bond from its 3' position to the 5 'position of the next nucleotide.

Modification of the 3 'end or Poly Tail (A)

Most eukaryotic mRNAs have a polyadenyl acid sequence at the 3 'end. This terminal stretch of waste A is often described as Poly (A) tail and the mRNA with these characteristics is called poly (A) +. The poly (A) sequence is not encoded in the DNA, but is added to the RNA in the nucleus after transcription. The addition of poly (A) is catalyzed by the enzyme poly (A) polymerase, which adds ~ 200 residues of A to the free 3'-OH end of the mRNA.

Nuclear splicing

Splicing occurs in the nucleus, along with the other modifications that the newly synthesized RNA undergoes. The transcript obtains its cap at the 5 'end, loses its introns and is polyadenylated at the 3' end. Then the RNA is transported through the nuclear pores to the cytoplasm where it will be available for translation.

You might be interested in
Mary has type A blood and her husband (John) has type B blood. John's parents both had type AB. Mary and John have three childre
pav-90 [236]
Since Mary has a Type A blood, she is either AA or AO while John is either BB or BO. Since both John's parents are Type AB, he can only have the either A or B as an allele and not O so he is BB. Since John can only give the B allele, all of his children must have the B allele in their blood types. So the adopted one is the child with type A blood.
8 0
3 years ago
PLEASE HELP!!!!!
Irina-Kira [14]

Answer:

A. meiosis

Explanation:

  • Meiosis is an asexual reproduction conducted by gametes to form four new, haploid cells.
  • It is important to ensure When fertilization occured, it form a zygote with diploid cells.
5 0
3 years ago
Read 2 more answers
I need help 7-15<br> Will reward you, maybe brainliest
JulsSmile [24]
Well it’s pretty easy 7 - 15 is 8
4 0
3 years ago
In order to retain heat, what occurs in the skin on a cold day?
liubo4ka [24]
C would be the answer, that way the cold temperatures won’t penetrate through
8 0
3 years ago
How are the genotypes and phenotypes of parents related to the genotypes and phenotypes of offspring (how are the offspring like
lozanna [386]

Mendel observed that a heterozygote offspring can show the same phenotype as the parent homozygote, so he concluded that there were some traits that dominated over other inherited traits. However, the relationship of genotype to phenotype is rarely as simple as the dominant and recessive patterns described by Mendel.

3 0
3 years ago
Read 2 more answers
Other questions:
  • what is the probability that two parents heterozygous for a particular trait will have a child that is homozygous recessive for
    5·1 answer
  • Which cells are produced during the first few divisions of the zygote?
    9·1 answer
  • Some bears kept in captivity allow veterinarians to routinely give them total body checkups. these bears open their mouths for t
    15·1 answer
  • The two major divisions of the nervous system are the somatic and endocrine systems.
    8·2 answers
  • A research article undergoes peer review. The primary purpose of the peer review process is to
    6·1 answer
  • What is an environmental variable that effects wing color in western white butterflies?
    12·1 answer
  • Which process produces carbon dioxide?
    14·2 answers
  • True or false? is deep ocean currents caused by the sinking of warm water near the poles?
    10·1 answer
  • Which of the following questions can be answered scientifically? (2 points)
    10·1 answer
  • Why it is important to place the gel in the correct direction in the gel cassette while running it?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!