EASY
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The genetically inactive and highly condensed region with tightly packed DNA which receives dark stain is

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Important Questions on Molecular Basis of Inheritance

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
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
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
DNA molecule which has the highest number of hydrogen bonds
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:

EASY

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

HARD
A novel species with double-stranded genetic material consists of 5 bases namely P,Q,R,S,T, with percentage given below.
  P Q R S T
Percentage 22 28 22 12 16
Based on the above information, which one of the following inferences is not supported by the observations?
EASY
The association of histone H1 with a nucleosome indicates:
HARD
A newly discovered organism possesses a genetic material with a new base composition consisting of the sugar and phosphate backbone as found in existing natural DNA. The five novel bases in this genetic material-namely, P,Q,R,S,T are heterocyclic structures with 1,1,2,2 and 3 rings, respectively. Assuming the new DNA forms a double helix of uniform width, which one of the following would be the most appropriate base pairing?
HARD

DNA molecule has length of 476 A with 20% guanosine. Choose the correct features of DNA

I) 56 CTP
II) 336 Hydrogen bonds
III) Total 150 nucleotides
IV) 84 TTP

MEDIUM

Match the following lists:

  List I   List II
A) X-ray diffraction data I) Chargaff
B) DNA double stranded II) Meischer
C) DNA double helix III) Wilkins
D) DNA as an acidic substance IV) Watson & Crick

The correct match is

HARD
A bacteriophage T2 particle contains within its head a double-stranded B-from DNA of molecular weight 1.2×108 Da. Assume that the head of a T2 Phage particle is of 210nm in length and the average molecular weight of a nucleotide is 330 Da. The length of the T2 genome is in the range of
EASY
Which of the following Nitrogen bases is found only in DNA ?
EASY
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
In sea urchin DNA, which is double-stranded, 17% of the bases were shown to be cytosine. What are the percentages of other three bases expected to be present in this DNA?