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Earn 100

Taylor and his colleagues proved the semi-conservative model of replication by performing experiments on ........(a)........... using .........(b).........

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Important Questions on Molecular Basis of Inheritance

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Taylor conducted the experiments to prove the semiconservative mode of chromosome replication on:
MEDIUM
Which one of the following will be the ratio of heavy, intermediate and light bands in Meselson and Stahl's experiment after two generations if DNA replication were conservative?
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E. coli fully labelled with N15 is allowed to grow in N14 medium. The two strands of DNA molecule of the first generation bacteria have:
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The association of histone H1 with a nucleosome indicates:
MEDIUM
Choose the correct pair from the following.
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Which of the following statements about nucleosome is true?
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Experiments involving use of radioactive thymidine to detect distribution of newly synthesized DNA in the chromosome was performed on which plant?
MEDIUM
Arrange the following in ascending order based on the aspects given below
a) No. of arms present in chromosome where the centromere is terminal.
b) Total No. of histone proteins present inside the nucleosome
c) No. of histone proteins help to seal the DNA near the core
d) No. of H2 proteins in a nucleosome
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E. coli has only 4.6×106 base pairs and completes the process of replication within 18 minutes; then the average rate of polymerisation is approximately:
MEDIUM
Light DNA N14 transferred to N15 labelled culture medium for replication. The ratio of total number of N15 and N14 labelled strands of DNA extracted from the culture after three generations
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If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6×109bp bp, then the length of the DNA is approximately
MEDIUM
During DNA replication, Okazaki fragments are used to elongate:
EASY
The length of DNA helix in a typical nucleosome is
HARD
Meselson and Stahl carried out centrifugation in CsCl2 density gradient to separate:
HARD

Assertion (A): Between DNA and RNA, DNA is a better genetic material.

Reason (R): 2' -OH group present in every nucleotide in RNA is a reactive group and make RNA labile and easily degradable.

The correct answer is:

MEDIUM

A: Composition of cell membrane of Erythrocyte
B: No. of strands present in peripheral fibril of centriole
C: No. of nucleotides in a typical nucleosome

I) 60% protein, 40% Lipids
II) 52% protein, 40% Lipids
III)  Phosphoglycolipids
IV) 3
V) 200
VI) 145

Select the option that correctly matches A, B and C respectively with I-VI.

MEDIUM
Choose the correct statement
I) Secondary metabolites do not have identifiable physiological processes in plants, fungal and microbial cells
II) Bio macromolecules are acid insoluble organic compounds with mol wt more than 10,000 daltons
III) Uridylic acid and cytidylic acids are derived from uracil and cytosine by esterification
IV) Lecithin and lectin are phospholipids found in cell membrane
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Which one of the following elements is not directly involved in transcription?
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Semiconservative replication of DNA was first demonstrated in
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The experimental proof for semiconservative replication of DNA was first shown in a