The following symbiotic relationships with the correct description are shown below:
- i. commensalism - c. symbiotic relationship in which one species is benefited, and the other is neither harmed nor benefited
- ii. parasitism - b. relationship in which one species benefits while harming the other.
- iv. symbiotic - d. symbiotic relationship in which both species benefit from the association.
<h3 /><h3>What is a Symbiotic relationship?</h3>
This type depicts a close ecological relationship between the individuals of two or more different species.
There are different types of this relationship which can be seen in the descriptions given above.
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The correct answer is: introns
Processing of mRNA is process that occurs only in eukaryotic cells. After the transcription, newly formed mRNA molecule is called and it must be processed into a messenger RNA (mRNA). Processing includes:
• Addition of a 5' cap to the beginning of the RNA
• Polyadenilation- addition of a poly-A tail (tail of A nucleotides) to the end of the RNA
• Splicing- removal of introns and linking the exons
After these steps mRNA is mature and used for the further steps (e.g. translation).
Sometimes some genes are alternatively spliced.
Quasar is a star like object that is very bright and distant.
Quasars are massive, bright, and most distant known celestial objects that release high amounts of energy in the form of electromagnetic radiation, which usually has a star-like image in a telescope. Quasars can only be found in galaxies that have super-massive black holes (black holes that have billions of times of solar masses). In quasars, the black holes are enclosed by a gaseous accretion disk.
