IIT JAM Exam > IIT JAM Questions > Which of the following is true about DNA vari...
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Which of the following is true about DNA variants
- a)B DNA has 34 Angstrom rise per turn
- b)Z DNA has two base pairs as repeating units
- c)A DNA is formed in excess of humidity
- d)A DNA has 2’ endo sugar puckering
Correct answer is option 'A,B'. Can you explain this answer?
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Verified Answer
Which of the following is true about DNA variantsa)B DNA has 34 Angstr...
Option (a) is correct. B DNA has 10.5 base pairs per helical turn and helix rise per base pair in B DNA is 3.4 Aº. Therefore rise per turn in B DNA will be 34 Å.
Option (b) is correct.
Z DNA is formed by DNA sequences in which pyrimidines alternate with purines especially alternating C and G. Hence Z DNA has GC as repeating unit.
Option (c) and (d) are incorrect as B DNA is formed in excess of humidity (92%). A DNA has 3’ endo sugar puckering.
Option (b) is correct.
Z DNA is formed by DNA sequences in which pyrimidines alternate with purines especially alternating C and G. Hence Z DNA has GC as repeating unit.
Option (c) and (d) are incorrect as B DNA is formed in excess of humidity (92%). A DNA has 3’ endo sugar puckering.
Most Upvoted Answer
Which of the following is true about DNA variantsa)B DNA has 34 Angstr...
Option (a) is correct. B DNA has 10.5 base pairs per helical turn and helix rise per base pair in B DNA is 3.4 Aº. Therefore rise per turn in B DNA will be 34 Å.
Option (b) is correct.
Z DNA is formed by DNA sequences in which pyrimidines alternate with purines especially alternating C and G. Hence Z DNA has GC as repeating unit.
Option (c) and (d) are incorrect as B DNA is formed in excess of humidity (92%). A DNA has 3’ endo sugar puckering.
Option (b) is correct.
Z DNA is formed by DNA sequences in which pyrimidines alternate with purines especially alternating C and G. Hence Z DNA has GC as repeating unit.
Option (c) and (d) are incorrect as B DNA is formed in excess of humidity (92%). A DNA has 3’ endo sugar puckering.
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Community Answer
Which of the following is true about DNA variantsa)B DNA has 34 Angstr...
C) A DNA is formed in excess of humidity
This is true. A DNA, also known as A-form DNA, is formed under conditions of low humidity or dehydration. It is a right-handed helix with 2.3 Angstrom rise per base pair.
This is true. A DNA, also known as A-form DNA, is formed under conditions of low humidity or dehydration. It is a right-handed helix with 2.3 Angstrom rise per base pair.
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Which of the following is true about DNA variantsa)B DNA has 34 Angstrom rise per turnb)Z DNA has two base pairs as repeating unitsc)A DNA is formed in excess of humidityd)A DNA has 2’ endo sugar puckeringCorrect answer is option 'A,B'. Can you explain this answer?
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