WorksheetsMolecular basis of inheritance
Total questions: 15
Worksheet time: 5mins
In a DNA strand the nucleotides are linked together by
glycosidic bonds
phosphodiester bonds
peptide bonds
hydorgen bonds.
The electric charge on DNA and histones is
both positive
both negative
zero
negative and positive respectively
The human chromosome with the highest and least number of genes in them are respectively
chromosome 21 and Y
chromosome 1 and X
chromosome 1 and Y
chromosome X and Y.
In prokaryotes, control of gene expression takes place at the level of
transcription
translation
DNA replication
All of the above
Which was the last human chromosome to be completely sequenced ?
Chromosome X
Chromosome 21
Chromosome 1
Chromosome Y
If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is: 5’ – ATGAATG – 3’, the sequence of bases in its RNA transcript would be
5’ – AUG A AUG – 3’
5’ – UACUU AC – 3’
5’ – CAUUCAU – 3’
5’ – GUAAGUA – 3’.
If the base sequence of a codon in mRNA is 5’ – AUG – 3′ the sequence of tRNA pairing with it must be
5’ – UAC – 3’
5’ – CAU – 3’
5’-AUG – 3’
5’ – GUA – 3’
In E. coli, the lac operon gets switched on when
lactose is present and it binds to the repressor
repressor binds to operator
RNA polymerase binds to the operator
lactose is present and it binds to RNA polymerase
If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?
20%
30%
40%
60%
How far is each base pair from the next one in DNA double helix model ?
2 nm
3.4 nm
34 nm
0.34 nm
The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called
chromosomes
nucleotides
nucleosomes
histone octamer
Find out the wrong statement about heterochromatin
It is densely packed
It stains dark.
It is transcriptionally active.
It is late replicating.
Which out of the following statements is incorrect ?
Genetic code is ambiguous.
Genetic code is degenerate
Genetic code is universal.
genetic code is punctuation-free
During translation, activated amino acids get linked to tRNA. This process is commonly called as
charging of tRNA
discharging of tRNA
aminoacylation of tRNA
Both A&C
Select the correct match of enzyme with its related function
DNA polymerase – Synthesis of DNA strands
Helicase – Unwinding of DNA helix
Ligase – Joins together short DNA segments
All of these
