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WorksheetsMolecular Basis of Inheritance 4
Total questions: 20
Worksheet time: 10mins
DNA replication takes place at _________ phase of the cell
cyle.
G1
S
G2
M
The process of copying genetic information from one strand of DNA to RNA is termed as _________ .
replication
transcription
translation
reverse transcription
The enzyme DNA dependent RNA polymerase catalyses the polymerisation reaction in ___________direction.
only 5’ → 3’
only 3’ → 5’
both (a) and (b)
none of these
If the sequence of bases in coding strand of DNA is ATTCGATG, then the sequence of bases in mRNA will be
TAAGCTAC
UAAGCUAC
ATTCGATG
AUUCGAUG.
If the sequence of bases in DNA is GCTTAGGCAA then the sequence of bases in its transcript will be
GCTTAGGCAA
CGAATCCGTT
CGAAUCCGUU
AACGGAUUCG.
Transcription unit
starts with TATA box
starts with pallendrous regions and ends with rho factor.
starts with promoter region and ends in terminator region
starts with CAAT region.
During transcription, the site of DNA molecule at which RNA polymerase binds is called
promoter
regulator
receptor
enhancer.
Polycistronic messenger RNA (mRNA) usually occurs in
bacteria
prokaryotes
eukaryotes
both (a) and (b)
In transcription in eukaryotes, heterogenous nuclear RNA (hnRNA) is tmascribed by
RNA polymerase I
RNA polymerase II
RNA polymerase III
all of these.
Methyl guanosine triphosphate is added to the 5’ end of hnRNA in a process of
splicing
capping
tailing
none of these
In eukaryotes, the process of processing of primary transcript involves
removal of introns
capping at 5’end
tailing (polyadenlation) at 3’ end
all of these.
In a n/RNA molecule, untranslated regions (UTRs) are present at
5’ – end (before start codon)
3’ – end (after stop codon)
both (a) and (b)
3’- end only.
UTRs are the untranslated regions present on
rRNA
hnRNA
mRNA
/RNA
Which of the following statements is correct regarding ribosomes ?
Most of a cell’s DNA molecule are stored there.
Complete polypeptide is released from there.
mRNAs are produced there.
DNA replication takes place there.
Regulation of gene expression occurs at the level of
transcription
processing/splicing
translation
all of these.
During expression of an operon, RNA polymerase binds to
structural gene
regulator gene
operator
promoter.
The sequence of structural genes in lac operon is
Lac A, Lac Y, Lac Z
Lac A, Lac Z, Lac Y
Lac Y, Lac A, Lac A
Lac Z, Lac Y, Lac A
Which of the following cannot act as inducer ?
Glucose
Lactose
Galactos
Both (a) and (c)
Human genome consists of approximately
3 × 109 bP
6 × 109 bp
20,000 – 25,000 bp
2.2 × 104 bp.
Estimated number of genes in human beings is
3,000
80,000
20,500
3 × 109
