List of top Biology Questions on The DNA

Which of the following statement(s) about eukaryotic DNA topoisomerase is/are correct?

What is the fate of a piece of DNA carrying only gene of interest which is transfered in to an alien organism?
A. The piece of DNA would be able to multiply itself independently in the progeny cells of the organism.
B. It may get integrated into the genome of the recipient.
C. It may multiple and be inherited along with the host DNA.
D. The alien piece of DNA is not an integral part of chromasame.
E. It shows ability to replicate.
Choose the correct answer from the options given below:

The DNA present in chloroplast is:

Hind II always cuts DNA molecules at a particular point called recognition sequence and it consists of:

Arrange the following steps of ‘Polymerase chain Reaction’ in a correct sequence.
(A) Annealing of primers 
(B) Amplified DNA 
(C) Denaturation of DNA 
(D) Extension of primers 
Choose the correct answer from the option given below

Match List -I with List-II

	List -I		List-II
A	Plasmid of salmonella	I	Join foreign DNA to plasmid
B	Restriction enzymes	II	Insertional inactivation
C	Ligases	III	Construction of 1st recombinant DNA
D	B-galactosidase	IV	Molecular scissors

Choose the correct answer from the option given below

Arrange the steps of ‘Agarose gel electrophoresis’ in the correct sequence.
A. Cutting of bonds of DNA from agarose gel
B. Visualisation of DNA fragments under UV radiation
C. Staining of DNA fragments with ethidium bromide
D. Movement of DNA fragments towards anode under electric field
Choose the correct answer from the options given below :

Arrange the given statements in correct sequence of their occurance in replication of retrovirus.
A. Viral DNA incorporates into host genome
B. Virus infects normal cell
C. Viral DNA is produced by reverse transcriptase
D. New viral RNA is produced by the infected cell
Choose the correct answer from the options given below :

Which of the following differ in RNA and DNA ?

Choose the correct statement :
A. ABO blood group is an example of multiple dominance.
B. Animals that have had their DNA manipulated to possess and express an extra gene are known as mutagenic animals.
C. During Bt cotton development, specific toxin genes were isolated from Bacillus tharingiensis.
D. Lactic acid bacteria grow in milk and convert it into curd.
Choose the correct answer from the options given below :

Identify the statements which are not true with respect to Heterochromatin.
(A) Loosely packed 
(B) Densely packed 
(C) Stains light 
(D) Transcriptionally active 
Choose the correct answer from the options given below:

A DNA fragment contains 18% Thymine (T). The combined content of Cytosine (C) and Guanine (G) in it would be:

If an E.coli with heavy DNA (N¹⁵) is put in a medium with NH₄Cl[N¹⁴] then, what type of DNA will be obtained after two generations/replications?

The correct sequence of steps to obtain gene of interest from pool of DNA is:
Cutting of DNA using restriction endonuclease.
Viewing the ethidium bromide stained gel under UV light.
Loading of DNA in wells.
Cutting and extraction of DNA piece from gel.
Separation of DNA fragments according to their molecular size.
Choose the correct answer from the options given below:

Arrange the following steps of gel electrophoresis in correct sequence :
(A) Staining the DNA with ethidium bromide
(B) Movement of DNA fragments towards anode under an electric field through agarose (C) Exposure to UV radiation
(D) Separation of DNA fragments according to their size
Choose the correct answer from the options given below:

If a scientist wants to recover many copies of the target DNA through recombinant DNA technology, what augmentation need to be done in cloning vector ?

The size of VNTR varies from:

Classical example of mutation arise due to change in a single base pair of DNA is:

Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage ?

Number of chromosomes present in secondary spermatocyte is

tRNA binds to mRNA through

Which of the following is similar in DNA of elephant and mango tree

Purines found both in DNA and RNA are:

DNA precipitation out of a mixture of biomolecules can be achieved by treatment with:

Arrange the following steps in the order of their occurance in the lytic cycle of a phage i) Maturation phase ii) Penetration phase iii) Attacinnenr iv) Release phase v) Biosynthesis The correct sequence is