Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Biology

Following are the features of genetic codes. What does each one indicate?
Stop codon; Unambiguous codon; Degenerate codon; Universal codon.

Describe the process of transcription in bacteria

How do m-RNA, t-RNA and ribosomes help in the process of translation?

Explain the process of transcription in prokaryotes.

1. Name the scientist who suggested that the genetic code should be made of a combination of three nucleotides.
2. Explain the basis on which he arrived at this conclusion.

Name the enzyme responsible for the transcription of tRNA and the amino acid the initiator tRNA gets linked with.

State the aim and describe Messelson and Stahl’s experiment.

Briefly describe the following:

Transcription 

How is Prokaryotic Transcription process different in eukaryotes?

Explain the processing the hnRNA needs to undergo before becoming functional mRNA in eukaryotes.

Explain the role of initiator tRNA in the initiation of protein synthesis.

Initiation codon of protein synthesis in Eukaryotes is ______.

The process of transfer of genetic information from DNA to RNA/formation of RNA from DNA is ______.

Reverse transcriptase is ______.

DNA template sequence of CTGATAGC is transcribed over mRNA as ______.

Which is not involved in protein synthesis?

If the sequence of bases in DNA is ATTCGATG, then the sequence of bases in its transcript will be ______.

The process of copying genetic information from one strand of DNA to RNA is termed as ______.

In a cell, DNA transcription is halted when ______ 

Read the following and answer from given below:

The translation is the process of polymerization of amino acids to form a polypeptide. The order and sequence of amino acids are defined by the sequence bases in the mRNA. The amino acids are joined by a bond called a peptide bond. The ribosome is the site of protein synthesis.

Which ion is essential for the association of both units of the ribosome at the time of protein formation?