In double helix of DNA, the two DNA stra...

In double helix of DNA, the two DNA strands are

coiled upon itself around a common axis

coiled around each other

coiled differently

coiled over protein sheath

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In a DNA double helix :

In double helix of DNA, there are sugar phosphate backbones with bases projected

In the double helix structure of DNA, the base pairs are

Fill in the blanks : (i) According to Watson and Ctick model, the DNA molecule consists of ............... long, parallel strands. The two strands are .............. around a common axis in a regular manner to form a ........... helix. (ii) These strands are made of ............ units. Each such unit consists of .......... , ......... and ............. (iii) In each chain, nitrogenous base molecules are joined to the sugar molecules by ............ bonds and project into the space enclosed in the helix at about .......... to the long axis of the helix. (iv) The nitrogenous bare may be a 9-membered, double ringed ....... or a 6-membered, single ringed ....... (v) The double helix of DNA has a constant diameter of ......... and one complete spiral (turn) of the helix is .......... long and has ........ base pairs. (vi) The mode of DNA replication is ........... (vii) Enzyme ............ cannot initiate the synthesis of a new DNA strand, although it can catalyze the growth of a DNA chain. Therefore, a short chain of .......... is formed on the DNA template at the 5' end. This is called ........ (viii) During DNA replication, one new strand is formed in continuous stretch in the 5' - 3' direction. It is called ........... strand. Other strand is formed in small fragments called .......... which are later joined to form a continuous strand termed ............ strand.

The double helix model of DNA was proposed by

DNA is double helix and :

In double strand helix structure of DNA, heterocyclic base cytosine forms hydrogen bond with

TRUEMAN BIOLOGY-BIOMOLECULES -MULTIPLE CHOICE QUESTIONS

Two strands of a molecule of DNA are linked sidewise by
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The smallest RNA is :-
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In double helix of DNA, the two DNA strands are
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The type of RNA responsible for proper se- quence of amino acids in pr...
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Which of the following RNAs have clover leaf structure?
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DNA strands are termed antilparallel be cause of
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In the double helix modle of DNA , how far is each base pair from the...
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The base sequence for a nucleic acid segment is given as GAG AGG GGA C...
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Which is correct sequence according to increasing molecular weight ?
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The area of DNA rich in A - T base pairs is called
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Purines of RNA are
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Deoxyribose sugar in DNA is
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The double stranded helical structure of DNA is maintained by
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if A=120 and C120, then a piece of DNA will have nucleotides.
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In E. coli DNA has 18% of bases of cytosine. What will be the fraction...
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In 'B' model of DNA,the diameter is 20Å. It is in Z DNA.
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Which statement is wrong about DNA ?
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The helical model for DNA given by Watson and Crick was
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Which one of the following ratios is variable but constant for a speci...
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if one chain of a DNA molecule has the base order 5'ATTGACGT3' . . . ....
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