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The template of DNA on which discontinuous replication occurs has polarity

5’to 3’

3’ to 5’

both a and b

None of these

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Explanation

solution- Refer NCERT, heading 6.4.2, page-106, para 2 line 11^th

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The discontinuously synthesised fragments are joined later by

DNA polymerase III

DNA ligase

DNA gyrase

DNA polymerase I

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Explanation

solution- Refer NCERT, heading 6.4.2, page-106, para 2 line 12^th

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In eukaryotes, the replication of DNA takes place

at S-phase of the cell cycle

before G2 and after G1phase of the cell cycle

at M phase

Both a and b

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Explanation

solution- Refer NCERT , heading 6.4.2, page-107, para 2 line 3^rd and S phase lies between G1 and G2 phase of the cell cycle

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Which of the following statement is not true for origin of replication

It’s a definite place where replication originates

It should be present on vector DNA for making recombinant DNA

It should be present in host in which vector DNA has to be transferred

Both b and c

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Explanation

solution- Refer NCERT, heading 6.4.2, page-107, para 1 line 2^nd and 3^rd

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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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