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Get Answers to all your Questions
- #Class 12
- #Medical
- #Biology
- #National Eligibility Cum Entrance Test
- #Genetics and Evolution
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Select the correct pair from the following:
- B-DNA - 92% relative humidity and low ionic strength
- A-DNA - 92% relative humidity and low ionic strength
- Z- DNA - diameter of the helix is 18Å
- A-DNA - comprises 11 base pairs
Option: 1
1, 2 & 3
Option: 2
1, 3 & 4
Option: 3
1, 2 & 4
Option: 4
2, 3 & 4
Answers (1)
As learnt in Types of DNA -
B-DNA:
- This structure of DNA is formed under the normal physiology conditions like 92% relative humidity and in low ionic strength.
A-DNA:
- It is formed under 75% relative humidity and in the presence of sodium, potassium and caesium ions.
- A single turn in A-form comprises 11 base pairs perpendicular to the helical axis.
Z-DNA:
- It is formed under very high salt concentration.
- The diameter of the Z-form helix is 18Å.
Hence, the correct option is (b).
View full answer
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