BIOMOLECULES AND ENZYMES

Detailed explanation-1: -A DNA molecule consisting only of guanines and cytosines is much more stable and melts around or above 100°C depending on the concentration of NaCl.

Detailed explanation-2: -The most stable is B-DNA conformation, although numerous other double helical structures can occur under specific conditions (A-DNA, Z-DNA, P-DNA).

Detailed explanation-3: -DNA is chemically stable, and the cell defends it with various protective and repair devices. When genes are altered, the consequences for the cell might not be disastrous: the system as a whole is robust, and the redundancy of the genetic code provides a buffer. So, in eukaryotes, does the abundance of “junk” DNA.

Detailed explanation-4: -The stability of the DNA double helix depends on a fine balance of interactions including hydrogen bonds between bases, hydrogen bonds between bases and surrounding water molecules, and base-stacking interactions between adjacent bases.

Detailed explanation-5: -Aromatic stacking and hydrogen bonding between nucleobases are two of the key interactions responsible for stabilization of DNA double-helical structures.