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To be expressed, a gene must first be ______ and then ______ A translated; replicated B...

To be expressed, a gene must first be ______ and then ______

A translated; replicated

B transcribed; replicated

C transcribed; translated

D translated; transcribed

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Answer #1

To be expressed a gene must first be transcribed and then translated. The correct answer is option C.

Transcription is the process of conversion of DNA into RNA with the help of RNA polymerase enzyme.

The three steps of transcription are:

  • Initiation : Leads to the formation of the transcription bubble after the helical structure is opened and the hydrogen bonds of the DNA are hydrolysed.
  • Elongation : Ribonucleotides are attached from 5 prime to 3 prime end. Per minute 40 ribonucleotides are added.
  • Termination : Two types of termination processes, one is Rho dependent and the other is Rho independent. In case of Rho independent termination, Palindromic sequence is present forming hairpin like structures which stops transcription. In case of Rho dependent, Rho factor attaches itself with the beta polypeptide and stops the hydrolysis.

Translation is the process of conversion of RNA into its corresponding proteins.

The three steps of translation are:

  • Initiation: Attachment of mRNA to the ribosome.
  • Elongation: Carboxyl group of P site of ribosome and amino group of A site of ribosome are attached and form peptide bond.
  • Termination: Translation is terminated when a non-sense codon is encountered on the mRNA.

DNA AN Apolymerase RNA + Protein

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