Q161
The Pneumococcus experiment proves that DNA is the genetic material
Correct Answer
Option A
Solution
(a) Griffith's experiment with Pneumococcus suggests that genetic material is responsible for transforming bacteria.
Molecular Basis of Inheritance
Q162
In DNA, when AGCT occurs, their association is as per which of the following pairs?
Correct Answer
Option C
Solution
(c) In DNA adenine always pairs with thymine and guanine always pairs with cytosine, this is called complementary base pairing.
Q163
The transfer RNA molecule in 3D appears
Correct Answer
Option A
Solution
(a) Kim et al (1973) suggested L shape model of t-RNA by X-Ray diffraction while studying phenyl alanine t-RNA of yeast.
Q164
Due to discovery of which of the following in 1980 the evolution was termed as RNA world?
Correct Answer
Option C
Solution
(c) Ribozymes are catalytically active RNA molecule discovered in 1980s.
They are self splicing introns indicating their possible role as intermediates in the evolution of biological systems from abiotic substances.
Q165
Extra-nuclear inheritance occurs in
Correct Answer
Option A
Solution
(a) Colour blindness follows sex-linked inheritance. Phenylketonuria is an in born error of metabolism.
Q166
Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage?
Correct Answer
Option D
Solution
(d) Alfred Hershey and Martha Chase studied bacteriophages, or viruses that attack bacteria.
In 1952, they conducted a series of experiments to prove that DNA is the genetic material.
They labelled the protein of bacteriophages with radioactive sulphur and their DNA with radioactive phosphorus.
Q167
The basis for DNA fingerprinting is
Correct Answer
Option A
Solution
(a) DNA fingerprinting is a technique to identify a person on the basis of his DNA which is specific for every individual.
This technique for the first time was developed by Alec Jeffreys and his colleagues at Leicester University in U.K.
DNA of an individual carries specific sequences of nucleotides which are repeated many times throughout the length of DNA.
This reveals polymorphism in DNA.
These are inherited.
Each individual inherits these repeats from his/her parents which are used as genetic markers in personal identity test.
Q168
DNA fingerprinting refers to
Correct Answer
Option A
Solution
(a) DNA fingerprinting is the technique of determining nucleotide sequences of certain areas of DNA which are unique to each individual.
DNA contains noncistronic hypervariable repeat sequences called VNTR.
DNA fingerprinting involves the identification of these VNTRs.
Q169
Satellite DNA is useful tool in:
Correct Answer
Option C
Solution
(c) Satellite DNA is useful in forensic science.
The polymorphism of minisatellite, microsatellite and minivariant repeats is analysed for DNA finger printing, DNA profiling.
It helps in the resolution of crimes, legal disputes etc.
Q170
In history of biology, human genome project led to the development of :
Correct Answer
Option C
Solution
(c) Common activities in bioinformatics include mapping and analysing DNA and protein sequences, aligning different DNA etc. are the part of human genome project.
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