Which of the following statement is not true ?

(a)In replication the total DNA of an organism gets duplicated

(b)In transcription complete one strand of the DNA gets copied

(c) In transcription only a segment of only one strands of the DNA gets copied

(d)Both b and c

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Why both the strands of DNA are not copied during transcription because

(a)RNA molecules with different sequences will be produced and hence proteins with different sequences will be produced.

(b)double stranded RNA molecules will be produced that would prevent translation of dsRNA

(c)cell will fail to produce proteins as no single stranded RNA is present

(d) All of the above

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Which of the following is not a unit of transcription unit

(a)A promoter

(b)The structural gene

(c)A terminator

(d)A operator

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The direction of transcription is

(a)always from 5’ to 3’

(b)always from 3’ to 5’

(c)depends on the template direction

(d)sometimes 5’ to 3’ and sometimes 3’ to 5’

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The strand of DNA which does not code for anything is referred to as

(A)anti-sense strand

(B)coding strand

(C)non-coding strand

(D)template strand

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which of the following is true for coding strand

(a) it’s known as template strand

(b)it’s polarity is 5’ to 3’

(c)it’s a sense strand

(d)Both b and c

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Which of the following is true for promoter and terminator of a transcription unit?

(a)Both flank the structural gene

(b)promoter is upstream of the structural gene w.r.t coding strand polarity

(c)terminator is downstream of the structural gene w.r.t coding strand polarity

(d)all of the above

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Template and coding strands are defined by the presence of

(a)terminator

(b)structural gene

(c)promoter

(d)all of these

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In transcription unit regulatory sequences are present

(a)always at the upstream of the promoter

(b) always at the downstream of the promoter

(c)may be present further upstream or downstream to the promoter

(d)before the structural gene and after the promoter

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Which of the following is incorrect for a gene?

(a)functional unit of inheritance

(b)sequence of DNA which codes for a protein only

(c)monocistronic or polycistronic

(d)DNA sequence coding for tRNA or rRNA molecule

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