Structure Of Dna And Rna

In the double-helix structure of DNA two hydrogen bonds are formed between which two bases of the opposite strands?

Which of the following are genetic elements?
(A) Plasmid
(B) Chromosome
(C) DNA polymerase
(D) Transposable element
(E) Genome
Choose the correct answer from the options given below:

Match List I with List II

List I (Moleculer Process)		List II (Molecule Involve)
A.	DNA Replication	I.	RNA Polymerase
B.	Transcription	II.	tRNA
C.	Protein folding	III.	DNA Gyrase
D.	Translation	IV.	Chaperones

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The method in which recombinant DNA is directly injected into the nucleus of an animal cell is known as :

Given below are two statements: One is lebelled as Assertion A and the other is labelled as Reason R.
Assertion A: Protoplasts cannot take up DNA and are not capable of regenerating whole plants.
Reason R: Plant cells are encased in a thick cell wall made of cellulose that poses a barrier to efficient gene transfer.
In the light of the above statements, choose the correct answer from the options given below:

Cloning with lambda replacement vectors involves the following steps. Arrange them from first to last, in the order they are performed.
A. Packaging of DNA to form viable phage particles
B. Using DNA ligase to connect lambda fragments to foreign DNA
C. Isolating vector DNA from phage particles
D. Infecting E-coli cells, with recombinant phage
E. Cutting vector DNA with suitable restriction enzyme
Choose the correct answer from the options given below:

Which of the following is true for restriction enymes (RE).
A. RE belong to the class of nucleases.
B. Each RE cuts DNA at specific points.
C. Exonucleases remove nucleotides within the DNA while Endonucleases remove nucleotides from the end of DNA.
D. When cut with same RE, resultant DNA fragments have the same kind of 'sticky ends'.
E. Each RE recognizes a specific palindrome in the DNA.
Choose the most appropriate answer from the options given below:

Match List I with List II

List I (Type of Molecule)		List II (Description)
A.	Carbohydrate	I.	Chain of nucleotides
B.	Phospholipid	II.	One or more sugar units
C.	DNA	III.	Chain of amino acids
D.	Protein	IV.	Glycerol, fatty acids, phosphate

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Given below are two statements:
Statement I: Viruses consist of a core of nucleic acid (DNA or RNA) surrounded by a protein coat, called capsid.
Statement II: In Human Immunodeficiency virus (HIV) there is an additional external envelop or membrane made of lipids and proteins.
In the light of the above statements, choose the correct answer from the options given below:

DNA is synthesized in the cell by