Question

In: Biology

6. Select all of the following statements that are true of the promoter of a gene....

6. Select all of the following statements that are true of the promoter of a gene.

A)it is transcribed
B)it is translated
C)it is post-transcriptionally modified
D)it binds to transcription factors

7. 5'-TTA-3' on the template strand would encode the message___?___during translation.

Solutions

Expert Solution

Ans. 6.

Promoters are found in DNA and they are never transcribed.

Because promoters are present upstream to the start site of transcription, and only region which are present downstream to the start site are transcribed.

Translation is -

The nucleotide sequence of mRNA translated into sequence of amino acids is called as translation.

Hence promoters lacks transcription and translation both because translation only happens on trancribed RNA.

Correct Ans is option D.

trancriotional factors binds on promoters and help in transcription as -

TBP ( TATA binding protein) binds on the TATA box of the promoters (-10 region) , and help in binding of other transcription factors.

In eukaryote there are many types of transcription factors like -

TF II D ( TBP + TAFs)

TAFs - TATA associated factors which are associated with TBP.

TF II B

TF II F

TF II H

TF II E etc.

These all transcriptional factors binds on promoter region and help in transcription.

​

Ans. 7.

5' TTA 3' sequence on the template strand will encode for mRNA ( messenger RNA) but not for protein translation.

because when it transcribed in mRNA it will converted into 5' UAA 3'  because in RNA there is U ( Uracil) makes complementary bond with A ( adenine) of DNA (template strand) unlike T=A in DNA.

this 5' UAA 3' is a stop codon recognised by RF1 ( ribosomal recycling factor) and causes termination of translation.

gladiator answered 2 years ago
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