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प्रश्न
Explain the structure and function of different types of RNA.
उत्तर
- mRNA (messenger RNA)-
- single-stranded
- carries a copy of instructions to carry out amino acid assembling &protein synthesis
- unstable
- 5% of total RNA
- In Prokaryotes – it is (polycistronic carrying coding sequence for many polypeptides
- Eukaryotes – (monocistronic) contain information for only one polypeptide.
Messenger RNA (mRNA)
-
tRNA (transfer RNA)-
- single-stranded clover-shaped with 4 arms highly folded -3 D structure
- translates the code from mRNA and transfers amino acid to ribosomes (to built proteins)
- unstable (also known as soluble RNA)
- 15% of total RNA.
Transfer RNA (tRNA)
-
rRNA (ribosomal RNA)-
- single-stranded
- make up the 2 subunits of ribosomes
- metabolically stable
- 80% total RNA
- A polymer with varied length from 120 – 3000 nucleotides & give ribosomes their shape
- Genes of rRNA employed for phylogenetic studies.
Ribosomal RNA (rRNA)
संबंधित प्रश्न
Write the sequence of the complementary strand for the following segment of a DNA molecule.
5' - CCGGTTAATACGGC - 3'
Draw structure of following.
Cytosine
An example of feedback inhibition is ______.
Distinguish between Nitrogen base and a base found in inorganic chemistry.
______ is a single ring compound.
Pentose sugar present in RNA is ______
Identify the monomer of nucleic acid.
Identify the INCORRECT match.
Purine derivative among the following bases is ____________.
Which of the following is not present in DNA?
What is the number of \[\begin{array}{cc}\\\backslash\phantom{.......}\\\phantom{}\ce{C = O}\\/\phantom{........}\end{array}\] groups present in nitrogen bases of nucleic acids, thymine and uracil respectively?
Write a note on the formation of α-helix.
If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine, and Cytosine in it?
Which carbon atom of deoxy Ribose sugar in DNA does not contain \[\begin{array}{cc}|\phantom{...}\\\ce{- C - OH}\\|\phantom{....}\\ \end{array}\] bond?
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category against it?
Watson and Crick (1953) proposed DNA double helix model and won the Nobel Prize; their model of DNA was based on:
- X-ray diffraction studies of DNA were done by Wilkins and Franklin.
- Chargaff’s base equivalence rule
- Griffith's transformation experiment
- Meselson and Stahl's experiment
Which of the following statements are correct?
- In animals, the causative agent of foot and mouth disease in single stranded RNA Aphthovirus.
-
In animals foot and mouth disease spreads by direct or indirect contact.
-
Anthrax is a disease of domestic animals caused by Bacillus anthracis.
-
Rinderpest is a contagious bacterial disease of cattle.
Write the structure of D-ribose.
