Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Organic Chemistry
The reason for double helical structure of DNA is operation of
1
Vander Waal's forces
2
Dipole-dipole interaction
3
Hydrogen bonding
4
More than one of the above
5
None of the above