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
Natasha_Volkova [10]
2 years ago
12

Are RNAs processed before translation is able to occur in Prokaryotes? Do only mRNAs undergo processing and maturation in Eukary

otes?
Biology
1 answer:
raketka [301]2 years ago
6 0

Answer: RNAs are not processed before translation in prokaryotes, this process only takes place in eukaryotes.

Explanation:

Messenger RNA or mRNA is a single-straded ribonucleic acid that transfers the genetic information from the DNA (deoxyribonucleic acid) molecule of the cell nucleus to a ribosome (which are the machinery responsible for protein synthesis) in the cytoplasm. mRNA determines the order in which the amino acids of a protein will be joined and acts as a template or pattern for the synthesis of that protein. To accomplish this, the DNA molecule must be transcribed into an RNA molecule, which is used for protein synthesis.

The messenger RNA obtained after transcription is known as primary transcribed RNA or precursor RNA or pre-mRNA, which in most cases is not released from the transcription complex in a fully active form, but in eukaryotes it must undergo modifications before it can perform its function (RNA processing or maturation). These modifications include:

  • Elimination of fragments (splicing): In most cases, the <u>mRNA undergoes the removal of internal, non-coding sequences called introns, and the connection of exons. This does not occur in prokaryotic cells</u>, as they do not have introns in their DNA.
  • Protection by CAP: <u>Addition to the 5' end of the structure called "cap" or "capping"</u>, which is a modified guanine nucleotide, 7-methylguanosine triphosphate, via a 5'-5' triphosphate linkage, instead of the usual 3',5'-phosphodiester linkage. This cap is necessary for the normal RNA translation process and to maintain its stability.
  • Polyadenylation signal: <u>Addition to the 3' end of a poly-A tail, a long polyadenylate sequence, whose bases are all adenine</u>. Its addition is mediated by a sequence or polyadenylation signal (AAAAAA), located 11-30 nucleotides upstream of the original 3' end. This tail protects the mRNA from degradation, and increases its half-life in the cytosol, so that more protein can be synthesized.

The mature mRNA (in eukaryotes) is transferred to the cytosol of the cell through pores in the nuclear envelope. Once in the cytoplasm, ribosomes are coupled to the mRNA. However, in prokaryotes, ribosome binding occurs while the mRNA strand is being synthesized. After a certain amount of time, the mRNA is degraded into its component nucleotides by ribonucleases. So, the transcription and translation processes are carried out in a similar way as in eukaryotic cells but they occur simultaneously. But, the fundamental difference is that, in prokaryotes, the messenger RNA does not undergo a maturation process and, therefore, no cap or tail is added and no introns are removed. Moreover, it does not have to leave the nucleus as in eukaryotes, because in prokaryotic cells there is no defined nucleus.

So, RNAs are not processed before translation in prokaryotes, this process only takes place in eukaryotes.

You might be interested in
What is a long-term effect of the increased primary productivity of a terrestrial ecosystem? A) The ecosystem will not be able t
elena-s [515]

I think C sorry if I am wrong

7 0
2 years ago
Read 2 more answers
Which of the following statements is false? Sunlight is the energy source for plant photosynthesis. Chlorophyll is contained in
pentagon [3]
<span>Option 1: Sunlight is the energy source for plant photosynthesis.
True: In photosynthesis, plants convert light energy from the sun to chemical energy in the form of glucose. 

Option 2: Chlorophyll is contained in organelles called chloroplasts.
True: Chlorophyll in the chloroplasts is what allows many wavelengths of light for be absorbed and used for photosynthesis. 

Option 3: A by-product of photosynthesis is carbon dioxide.
False: Plants require carbon dioxide to create glucose, and produce oxygen as a by-product. 

Option 4: Roots have tiny root hairs that maximize the plant's ability to absorb water. 
True: Root hairs are very important for the absorption of nutrients and water by plant roots. </span><span /><span>
</span>
5 0
3 years ago
Read 2 more answers
What must happen for sexual reproduction to take place in a flatworm?
makvit [3.9K]
Two individual flatworms must transfer sperm to each other
4 0
3 years ago
Read 2 more answers
Write a sentence with the word troposphere
gavmur [86]

Answer:

A troposphere is the word that i dont know what it means

4 0
2 years ago
The pathway leading from the striate cortex to the parietal lobe is known as the
Ray Of Light [21]
In the two-streams hypothesis, a model for the process of vision, information moves from the striate cortex to the parietal lobe by way of the morsel stream also called the where pathway. This pathway is involved with defining the spatial qualities of an object relative to the viewer. 
5 0
3 years ago
Other questions:
  • Complete the following statement to show correct safety procedures. “ Tom dropped a glass beaker, which contained liquid, on the
    11·1 answer
  • Why was protein originally thought to be the genetic information storage molecule instead of dna?
    6·1 answer
  • Fossilized stromatolitesa. all date from 2.7 billion years ago.b. formed around deep-sea vents.c. resemble structures formed by
    15·1 answer
  • The best evidence that there is a critical period for language acquisition is the fact that
    14·1 answer
  • which of the following does not provide sufficient evidence that living things have been evolving for millions of years ​
    5·1 answer
  • Nervous tissue contains specialized cells called
    15·1 answer
  • A small complex organic molecule, often derived from vitamins, that acts in conjunction with an enzyme with an enzyme is known a
    15·1 answer
  • in 1907, Duncan preformed a series experiments in which he attempted to measure the weight of a soul as it left a dying person i
    10·1 answer
  • True or false: An allele is a version of a gene?
    9·1 answer
  • Slugs are mostly made of water, and CELLS. Every living thing is made of TONS and TONS of cells. Cells of a slug hold its water.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!