DNA Structure Quiz

What shape is the DNA molecule most commonly associated with?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

Which components form the "rungs" of the DNA ladder?

• Sugar and phosphate

• Amino acids

• Nitrogenous bases

• Hydrogen bonds

What type of bond holds the two DNA strands together?

• Covalent bonds

• Ionic bonds

• Hydrogen bonds

• Van der Waals forces

During DNA replication, what is the role of the enzyme DNA polymerase?

• Unzipping the DNA helix

• Adding nucleotides to the growing DNA strand

• Breaking hydrogen bonds between base pairs

• Forming the sugar-phosphate backbone

Which of the following is not a step in DNA replication?

• Initiation

• Elongation

• Termination

• Translation

What is the significance of DNA replication?

• It repairs damaged DNA.

• It allows cells to divide.

• It synthesizes RNA.

• It produces proteins.

Which enzyme is responsible for "unzipping" the DNA double helix?

• DNA polymerase

• RNA polymerase

• Helicase

• Ligase

What is the role of DNA in inheritance?

• It provides energy for cellular processes.

• It synthesizes proteins needed for metabolism.

• It carries genetic information from parents to offspring.

• It helps in the digestion of food.

Which of the following pairs of nitrogenous bases in DNA form a base pair with two hydrogen bonds?

• Adenine and Thymine

• Cytosine and Guanine

• Adenine and Guanine

• Thymine and Cytosine

What is the function of ligase in DNA replication?

• It synthesizes new DNA strands.

• It unwinds the DNA helix.

• It joins Okazaki fragments on the lagging strand.

• It corrects mistakes in DNA sequencing.