Understanding DNA Structure and Hydrogen Bonding

What is the correct pairing of nucleotide bases in a DNA molecule?

• A with A and C with C

• A with G and C with T

• A with T and C with G

• A with C and G with T

What type of bond is primarily responsible for holding the two halves of the DNA molecule together?

• Ionic bond

• Covalent bond

• Hydrogen bond

• Metallic bond

What is the role of hydrogen in the connections between nucleotide bases?

• Hydrogen forms hydrogen bonds with bases.

• Hydrogen forms covalent bonds with bases.

• Hydrogen acts as a catalyst.

• Hydrogen is not involved in base connections.

Why are hydrogen bonds important in the structure of DNA?

• They are the strongest type of chemical bond.

• They prevent the DNA from interacting with other molecules.

• They allow the DNA strands to be flexible.

• They are strong enough to hold the strands together but weak enough to allow separation.

Why is it important for DNA to be able to separate?

• To prevent mutations in the DNA sequence.

• To allow DNA to change its structure.

• To enable DNA to dissolve in water.

• To allow for the formation of new cells and DNA replication.