NEW
Font size
WorksheetsMolecular Basis - 23-08-23
Total questions: 14
Worksheet time: 7mins
The Hershey-Chase experiment determined that
(a) protein and DNA are the hereditory materials of viruses
(b) protein, not DNA, is the hereditary material of viruses
(c) viruses do not contain hereditary material
(d) DNA, not protein, is the hereditary material of viruses.
Information used by Watson and Crick to determine the structure of DNA included
(a) electron micrographs of individual DNA molecules
(b) light micrographs of bacteriophage particles
(c) nuclear magnetic resonance analysis of DNA
(d) X-ray crystallography of double-stranded DNA
Double-stranded DNA looks a little like a ladder that has been twisted into a helix or spiral. The side supports of the ladder are
(a) individual nitrogenous bases
(b) alternating bases and sugars
(c) alternating bases and phosphate groups
(d) alternating sugars and phosphates
The steps of the ladder are
(a) individual nitrogenous bases
(b) pairs of bases
(c) alternating bases and phosphate groups
(d) alternating sugars and bases
Experiments by Avery, Macleod, and McCarty supported DNA as the genetic material by showing that
(a) both protein and DNA samples provided the transforming factor
(b) DNA was not complex enough to be the genetic material
(c) only samples with DNA provided transforming activity
(d) even though DNA was molecularly simple, it provided adequate variation to act as the genetic material
Hershey and Chase used radioactive 35S and 32P in experiments to provide evidence that DNA was the genetic material. These experiments pointed to DNA because
(a) progeny viruses retained 32P but not 35S
(b) retention of 32P in progeny viruses indicated that DNA was passed on
(c) loss of 35S in progeny viruses indicated that proteins were not passed on
(d) All of the above
Arrange them on the basis of increasing size:
(a) Nucleotide, chromosome, gene, genome
(b) Genome, chromosome, Nucleotide gene
(c) Nucleotide, genome, gene, chromosome
(d) Nucleotide, gene, chromosome, genome
In the process of transcription in Eukaryotes, the RNA polymerase I transcribes
(a) Precursor of mRNA, hnRNA
(b) mRNA with additional processing, capping and tailing
(c) tRNA, 5 srRNA and snRNAs
(d) rRNAs – 28 S, 18 S and 5.8 S
The nucleosome structure of eukaryotic chromatin is due to all of the following histones, except
(a) H1
(b) H2A
(c) H2B
(d) H3
A : Nitrogen base is linked to pentose sugar through
N-glycosidic linkage.
B : Phosphate group is linked to 5’ - OH of a nucleoside
through phosphoester linkage.
(1) If both statements are correct
(2) If both statements are incorrect
(3) If only statement A is correct
(4) If only statement B is correct
A : Negatively charged DNA is wrapped around
positively charged histone octamer to form
nucleosome.
B : Enzyme required to catalyse polymerisation of
deoxynucleotides is DNA polymerase.
(1) If both statements are correct
(2) If both statements are incorrect
(3) If only statement A is correct
(4) If only statement B is correct
A : snRNAs are transcribed with the help of RNA
polymerase III.
B : Codon with dual function is AUG.
(1) If both statements are correct
(2) If both statements are incorrect
(3) If only statement A is correct
(4) If only statement B is correct
Assertion:- Complementary base pairing confers
a very unique property to the DNA chains.
Reason:- If sequence of one strand is known then
sequence in other strand can be predicted.
(1) If both Assertion & Reason are True and the Reason is a correct explanation of the Assertion.
(2) If both Assertion & Reason are True but the Reason is not a correct explanation of the Assertion.
(3) If Assertion is True but the Reason is false.
(4) If both Assertion & Reason are false.
Assertion:- Base pairing between purine and
pyrimidines allows uniform distance between two
strands of the helix.
Reason:- Number of hydrogen bonds between
pairing bases are constant.
(1) If both Assertion & Reason are True and the Reason is a correct explanation of the Assertion.
(2) If both Assertion & Reason are True but the Reason is not a correct explanation of the Assertion.
(3) If Assertion is True but the Reason is false.
(4) If both Assertion & Reason are false.
