Understanding DNA Structure

What molecule is being discussed in this video?

• DNA

• Protein

• RNA

• Carbohydrate

What is the most common form of DNA mentioned?

• C-form DNA

• A-form DNA

• B-form DNA

• Z-form DNA

What are the components of a nucleotide?

• Sugar, phosphate group, nitrogenous base

• Phosphate group, amino acid, fatty acid

• Sugar, fatty acid, nitrogenous base

• Sugar, amino acid, nitrogenous base

Which of the following is not a component of a nucleotide?

• Phosphate group

• Five-carbon sugar

• Nitrogenous base

• Amino acid

What distinguishes deoxyribose in DNA from ribose in RNA?

• Deoxyribose has an additional oxygen atom.

• Deoxyribose lacks an oxygen atom at the 2' carbon.

• Deoxyribose has an additional phosphate group.

• Deoxyribose is a six-carbon sugar.

What bonds connect nucleotides together in a DNA strand?

• Covalent bonds

• Ionic bonds

• Phosphodiester bonds

• Hydrogen bonds

What is the significance of the 5' to 3' directionality in DNA?

• It determines the direction of DNA replication.

• It is only present in RNA.

• It has no biological significance.

• It indicates the presence of uracil.

What is the function of phosphodiester bonds in DNA?

• They stabilize the double helix externally.

• They are involved in base pairing.

• They form the backbone of the DNA molecule.

• They connect amino acids in proteins.

Which base pairs with Adenine?

• Cytosine

• Guanine

• Uracil

• Thymine

How many hydrogen bonds form between Adenine and Thymine?

• One

• Four

• Two

• Three