Question

if one strand of a DNA molecule has the sequence of bases 5'ATTGCA3', mRNA which transcribes...

if one strand of a DNA molecule has the sequence of bases 5'ATTGCA3', mRNA which transcribes from this strand would have the sequence *

a..5'..UAACGU..3'.

b..3'..TAACGT..5'.

c..5..'TAACGT..3'.

d..5'..AUUGCA..3'.

how the ans. is D? i thought it is A

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Answer #1

ANS. D. 5' AUUGCA 3' is right

because the sequence of dna is 5' ATTGCA 3' ::: which act as coading strand ( sense strand) ,

In DNA transcription , the coading strand is the DNA strand whose base sequence corresponds to the base sequence of RNA transcript produced ( only thymine replaced by Uracil) . This strand contain codons. So, coading strand of DNA is 5'- ATTGCA- 3' and the mRna form is 5'- AUUGCA-3' .

m

mRna does not consist of the same four bases (A,T,G,C) as DNA. While RNA replace the thymine (T) with Uracil ( U) .

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