Exploring DNA: Structure and Replication

What is the shape of the DNA molecule?

• Linear

• Double helix

• Circular

• Zigzag

Which of the following base pairs is correct according to the base pairing rules?

• Adenine - Cytosine

• Guanine - Thymine

• Adenine - Thymine

• Cytosine - Thymine

During DNA replication, which enzyme is responsible for unwinding the DNA double helix?

• DNA polymerase

• Helicase

• Ligase

• Primase

Explain why DNA replication is considered semi-conservative.

• Each new DNA molecule contains two new strands.

• Each new DNA molecule contains one old strand and one new strand.

• Each new DNA molecule contains two old strands.

• Each new DNA molecule contains a mixture of old and new segments.

Identify the enzyme that adds nucleotides to the growing DNA strand during replication.

• Helicase

• Ligase

• DNA polymerase

• Primase

Which of the following statements best describes the importance of DNA?

• DNA is a source of energy for cells.

• DNA stores genetic information necessary for the development and functioning of living organisms.

• DNA is a structural component of cell membranes.

• DNA is used to transport oxygen in the blood.

Tags

NGSS.HS-LS1-1

NGSS.HS-LS3-1

What is the complementary strand of the DNA sequence 5'-ATCG-3'?

• 5'-TAGC-3'

• 3'-TAGC-5'

• 5'-CGAT-3'

• 3'-CGAT-5'

Describe the role of base pairing in the process of DNA replication.

• Base pairing allows DNA to form a double helix structure.

• Base pairing ensures that each new DNA molecule is an exact copy of the original.

• Base pairing provides energy for the replication process.

• Base pairing helps in the transport of DNA out of the nucleus.

Which sequence of DNA bases would pair with this partial strand?

• ATG TGA CAG

• TAC ACT GTC

• GTA AGT GAC

• CAT TCA CTG

Nitrogenous bases are joined by which type of bond?

• polar bonds
• ionic bonds
• covalent bonds
• hydrogen bonds

Tags

NGSS.MS-PS1-1