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WorksheetsMolecular basis of inheritance
Total questions: 21
Worksheet time: 21mins
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
Which of the following types of bacteria were used in Griffith’s transformation experiment?
Diplococcus, R-III and S-II type
Pneumococcus, T2 phage
Streptococcus, R-II and S-III type
Diplococcus, E. coli
THE EQUIVALENT OF STRUCTURAL GENE IS
MUTON
CISTRON
OPERON
RECON
Which of the following is required as inducer for the expression of lac operon?
Lactose
Galactose and Lactose
Glucose
Galactose
ASSERTION-The nitrogenous base of two chains of DNA are held together by hydrogen bonds
Reason-Both chains of DNA are antiparallel
If both Assertion and Reason are true and reason is correct explanation of Assertion
If both Assertion and Reason are true but reason is not correct explanation of Assertion
Assertion is true reason is false
Both Assertion and Reason are false
Regulation of gene expression occurs at the level of
transcription
processing/splicing
translation
all of these.
Based on the experiments by Hershey and Chase, which of the following statements are true? (Choose all the correct answers)
(i) They conducted their experiment on the fact that DNA contains phosphorous.
(ii) They conducted their experiments on the fact that proteins contain phosphorous.
(iii) They incorporated radioactive isotope of phosphorous into bacteriophage.
(iv) They showed that when P32 was used all radioactivity was associated with bacterial cells
(v) The isotopes P32 and S35 were used independantly to infect the bacterium E coli
What are those structures that appear as ‘beads-on-string’ in the chromosomes when viewed under electron microscope?
Base pairs
Genes
Nucleotides
Nucleosomes
Which of the following is not the characteristic feature of genetic code
Triplet nature
Mostly universal
Ambiguous
Degeneracy
In a virus, the percentage of thymine was 21%, adenine 32%, cytosine 23% and guanine 24% in its genetic material. The nature of genetic material present in this virus is
ds DNA
ss DNA
ss RNA
ds RNA
The bioactive substance which removes clots from blood vessels is
Butyric acid
Cyclosporin A
Statins
Streptokinase
Bacillus thuringiensis is used as biocontrol agent against
Mosquitoes
Aphids
Pathogenic fungi
Butterfly caterpillars
In a 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number of cytosine bases?
780
1560
740
1480
Escherichia coli with completely radioactive DNA was allowed to replicate in nonradioactive medium for two generations. Percentage of bacteria with radioactive DNA is
12.5%
25%
50%
100%
Select the correct option from the following :
(A)-(iii), (B)-(ii), (C)-(i)
(A)-(i), (B)-(iii), (C)-(ii)
(A)-(i), (B)-(ii), (C)-(iii)
(A)-(ii), (B)-(iii), (C)-(i)
To make protein with 178 amino acid from eukaryotic gene having 1350 bp, the length of initial and processed mRNA transcript would respectively be
640 b, 52 b
1350 b, 1350 b
1350 b, 537 b
670 b, 540 b
If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?
11
33
333
1
What will be the sequence of mRNA produced by the following stretch of DNA?
3' ATGCATGCATGCATG 5' TEMPLATE STRAND
5' TACGTACGTACGTAC 3' CODING STRAND
3' AUGCAUGCAUGCAUG 3'
3' AUGCAUGCAUGCAUG 5'
5' UACGUACGUACGUAC 3'
3' UACGUACGUACGUAC 5'
If the distance between two consecutive base pairs is 0.34nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6×109 base pair , then the length of the DNA is approximately
2.2 meters
2.5 meters
2.7 meters
2.0 meters
Read the following four statements (A-D):
(A) In transcription, adenosine pairs with uracil.
(B) Regulation of lac operon by repressor is referred to as positive regulation.
(C) The human genome has approximately 50,000 genes.
(D) Haemophilia is a sex-linked recessive disease.
How many of the above statements are right ?
Two
Three
Four
One
The correct match is
I – D, II – B, III – A, IV – C
I – B, II – A, III – D, IV – C
I – D, II – C, III – A, IV – B
I – B, II – C, III – A, IV – D
