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प्रश्न
What is degeneracy of genetic code?
Explain when is a genetic code said to be degerate.
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उत्तर
Usually, the single amino acid is encoded by a single codon. However, some amino acids are encoded by more than one codon. e.g. Cysteine has two codons, while isoleucine has three codons. This is called the degeneracy of the code. Degeneracy of the code is explained by the Wobble hypothesis. Here, the first two bases in different codons are identical but the third one varies.
संबंधित प्रश्न
Explain the process of translation.
The enzyme required for transcription is _______.
Short Answer Question:
In the figure below A, B and C are three types of ______.
Long Answer Question:
Justify the statement. If the answer is false, change the underlined word(s) to make the statement true
The process of translation occurs at the ribosome.
How t-RNA act as an adapter molecule?
Explain in detail with the help of a diagram.
____________ refers to the process of copying of genetic information from one (template) strand of DNA into a single stranded RNA transcript.
____________ refers to the mechanism in which codons of mRNA are translated and specific amino acids in a sequence form a polypeptide on ribosomes.
The enzyme ______ forms the peptide bond between amino acid on the first initiator t-RNA at P-site and amino acid on t-RNA at A-site.
A mature mRNA consists of 900 bases without any stop codon in between. What would be the number of amino acids coded by this mRNA during translation?
Genetic code consists of ______.
Identify the INCORRECT statement.
Match the Column I (RNA polymerases) with Column II (Transcribed products) and select the correct option.
| Column I | Column II | ||
| i. | RNA polymeraseI | a. | t-RNA |
| ii. | RNA polymerase II | b | rRNA |
| iii. | RNA polymerase III | c. | hnRNA |
Select the correct option from the following:
Identify the process represented in the diagram given below.
Sequential order of nucleotides on template strand forming m-RNA synthesizing specific protein is given below. Based on it select the sequential t-RNA anticodon entering in the process of protein synthesis.
Template: TAC GAC AAC CAC TTA ATT
Identify the CORRECT statements.
- Conversion of hnRNA to mRNA - Processing
- Removal of introns and joining of exons - Splicing
- Methyl adenosine triphosphate is added to 5'-end of hnRNA- Capping
- Addition of adenylate residues to 5' end in a template-dependent manner - Tailing
Which one ofthe following shows clover leaf model?
Which one of the following is NOT a structural part of a transcription unit in DNA?
Initiation of polypeptide chain in protein synthesis is induced by:
Describe the process of transcription.
Given below is a stretch of DNA showing the coding strand of a structural gene of a transcription unit?
5’-ATG ACC GTA TTT TCT GTA GTG CCC GTA CTT CAG GCA TAA-3’
- Write the corresponding template strand and the mRNA strand that will be transcribed, along with its polarity.
- If GUA of the transcribed mRNA is an intron, depict the sequence involved in the formation of mRNA/the mature processed hnRNA strand.
i. In a bacterium
ii. In humans - Upon translation, how many amino acids will the resulting polypeptide have? Justify.
