EASY
Earn 100

Select the nucleosides.
(I) Adenosine
(II) Uridylic acid
(III) Uridine
(IV) Cytidylic acid
(a)I and II only
(b)I and III only
(c)III and IV only
(d)II and III only

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Important Questions on Molecular Basis of Inheritance
MEDIUM
Choose the correct statement
Secondary metabolites do not have identifiable physiological processes in plants, fungal and microbial cells
Bio macromolecules are acid insoluble organic compounds with mol wt more than daltons
Uridylic acid and cytidylic acids are derived from uracil and cytosine by esterification
Lecithin and lectin are phospholipids found in cell membrane

EASY
The length of DNA helix in a typical nucleosome is

MEDIUM
Arrange the following in ascending order based on the aspects given below
No. of arms present in chromosome where the centromere is terminal.
Total No. of histone proteins present inside the nucleosome
No. of histone proteins help to seal the near the core
No. of proteins in a nucleosome

MEDIUM
: Composition of cell membrane of Erythrocyte
: No. of strands present in peripheral fibril of centriole
: No. of nucleotides in a typical nucleosome
protein, Lipids
protein, Lipids
Phosphoglycolipids
Select the option that correctly matches respectively with .

EASY
Purines found both in DNA and RNA are

MEDIUM
DNA molecule which has the highest number of hydrogen bonds

HARD
Assertion Between and , is a better genetic material.
Reason group present in every nucleotide in is a reactive group and make labile and easily degradable.
The correct answer is:

EASY
, present in the nucleus, was named as 'Nuclein' by

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

EASY
Which of the following statements is correct?

HARD
A novel species with double-stranded genetic material consists of bases namely with percentage given below.
Percentage |

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 . The five novel bases in this genetic material-namely, are heterocyclic structures with and rings, respectively. Assuming the new 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 with guanosine. Choose the correct features of
Hydrogen bonds
Total nucleotides

MEDIUM
Match the following lists:
List | List | ||
A) | X-ray diffraction data | Chargaff | |
B) | DNA double stranded | Meischer | |
C) | DNA double helix | Wilkins | |
D) | DNA as an acidic substance | Watson Crick |
The correct match is

HARD
A bacteriophage particle contains within its head a double-stranded -from DNA of molecular weight Assume that the head of a Phage particle is of in length and the average molecular weight of a nucleotide is The length of the 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 and the total number of base pairs of a DNA double helix in a typical mammalian cell is bp, then the length of the DNA is approximately

MEDIUM
In sea urchin DNA, which is double-stranded, of the bases were shown to be cytosine. What are the percentages of other three bases expected to be present in this DNA?

