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DNA

Why double st...

Question

Why double stranded rna( if formed during transcription) cannot undergo translation?

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Solution

if dsRNA is formed how the ribosome subunit will bind to form initiation complex? how tRNA will read the code?not possible.

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Q. How many of the following statements are correct ?

A. DNA dependent DNA polymerase requires DNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

B. DNA dependent DNA polymerase requires RNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

C. During replication, unwinding of DNA double helix forms a fork-like structure called replication fork.

D. During transcription, unwinding of the DNA double helix by DNA dependent RNA polymerase forms a transcription bubble.

E. During transcription, unwinding of DNA double helix by DNA dependent RNA polymerase forms a transcription fork.

Q.
What is reverse transcription ? Explain how single stranded RNA of viruses give rise to double stranded DNA.

Q. How many of the following statements are correct with respect to transcription?

i) Both the strands of DNA function as template for transcription

ii) The transcribed strand separates from the template strand

iii) A primer is required for transcription

iv) A double stranded RNA is formed after transcription

v) RNA polymerase catalyses the process of transcription

Q. “Both the strands of DNA are not copied during transcription”.
Choose the correct reasons from the following.

A. If both strands of DNA act as a template, RNA would be coded with different sequences, leading to formation of two different polypeptide chains from the same segment of DNA.

B. If both strands of DNA act as a template, RNA would be coded with different sequences, leading to formation of the same polypeptide chains from the same segment of DNA.

C. If both strands of DNA act as a template for transcription, it simplifies the genetic information transfer machinery.

D. If both strands of DNA act as a template for transcription, it complicates the genetic information transfer machinery.

E. If both strands of DNA act as a template for transcription, dsRNA would be formed which would prevent protein formation.

Q. Both the strand of DNA are not copied during transcription because

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