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Botany MCQs for NEET — Practice Questions with Answers

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Which of the following statement is not true ?

In replication the total DNA of an organism gets duplicated

In transcription complete one strand of the DNA gets copied

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

Both b and c

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Explanation

solution- Refer NCERT, heading 6.5, page-107, para 1 line 7^th

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

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

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

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

All of the above

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Explanation

solution- Refer NCERT, heading 6.5, page-107, para 2 complete

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Which of the following is not a unit of transcription unit

A promoter

The structural gene

A terminator

A operator

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Explanation

solution- Refer NCERT, heading 6.5.1, page-107, para 1

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The direction of transcription is

always from 5’ to 3’

always from 3’ to 5’

depends on the template direction

sometimes 5’ to 3’ and sometimes 3’ to 5’

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Explanation

solution- Refer NCERT, heading 6.5.1, page-108, para 1, line 4^th

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which of the following is true for coding strand

it’s known as template strand

it’s polarity is 5’ to 3’

it’s a sense strand

Both b and c

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Explanation

solution- Refer NCERT, heading 6.5.1, page-108, para 1, line 9^th

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

Both flank the structural gene

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

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

all of the above

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Explanation

solution- Refer NCERT, heading 6.5.1, page-108, para 2, line 1^st to 4^th

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Template and coding strands are defined by the presence of

terminator

structural gene

promoter

all of these

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Explanation

solution- Refer NCERT, heading 6.5.1, page-108, para 2, line 5^thand 6^th

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In transcription unit regulatory sequences are present

always at the upstream of the promoter

always at the downstream of the promoter

may be present further upstream or downstream to the promoter

before the structural gene and after the promoter

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Explanation

solution- Refer NCERT, heading 6.5.1, page-108, para 1, line 10^th and 11^th

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Which of the following is incorrect for a gene?

functional unit of inheritance

sequence of DNA which codes for a protein only

monocistronic or polycistronic

DNA sequence coding for tRNA or rRNA molecule

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Explanation

solution- Refer NCERT, heading 6.5.2, page-109and 108, para 1, line 1^st to 3^rd

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Which of the following is a false statement?

structural gene in transcription unit could be polycistronic in eukaryotes

structural gene in transcription unit could be polycistronic in prokaryotes

structural gene in transcription unit could be monocistronic in eukaryotes

None of these

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Explanation

solution- Refer NCERT, heading 6.5.2, page-109, para 1, line 4^th and 5^th

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