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प्रश्न
Explain the structure and function of different types of RNA.
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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
The following statement applies to DNA only, some to RNA only, and some to both. Label them accordingly.
The polynucleotide is double stranded. (_______)
The following statement applies to DNA only, some to RNA only, and some to both. Label them accordingly.
The polynucleotide contains D-ribose. (_______)
Write the sequence of the complementary strand for the following segment of a DNA molecule.
5' - CCGGTTAATACGGC - 3'
Draw structure of following.
Cytosine
Complete the flow chart on central dogma.
Give names of the purines.
Which carbon atom of deoxy Ribose sugar in DNA does not contain \[\begin{array}{cc}|\phantom{...}\\\ce{- C - OH}\\|\phantom{....}\\ \end{array}\] bond?
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.
Match List - I with List - II.
| List - I | List - II |
| A. Adenosine | I. Nitrogen base |
| B. Adenylic acid | II. Nucleotide |
| C. Adenine | III. Nucleoside |
| D. Alanine | IV. Amino acid |
Choose the option with all correct matches.
