Final answer:
Hydrogen bonds form between the nitrogenous bases on opposite strands of DNA and play a crucial role in the stability and functionality of DNA.Option a.
Step-by-step explanation:
The type of weak chemical bond formed between the nitrogenous bases on opposite strands of DNA is hydrogen bond. Hydrogen bonds form between the complementary nitrogenous bases on the interior of DNA. These bonds are important for maintaining the double-helix structure of DNA.
Hydrogen bonds are relatively weak compared to covalent bonds, but they play a crucial role in the stability and functionality of DNA. When the two DNA strands are exposed to high temperatures or certain chemicals, the hydrogen bonds can be broken, causing the strands to separate into single strands of DNA.
However, the strands can reanneal and reform the hydrogen bonds to become double-stranded DNA again.
So Option a is correct.