DNA: The Molecule of Life Quiz

What is the shape of the DNA molecule?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

Which components form the backbone of the DNA molecule?

• Nitrogenous bases and phosphate groups

• Sugar and nitrogenous bases

• Sugar and phosphate groups

• Phosphate groups and hydrogen bonds

What are the four nitrogenous bases in DNA?

• Adenine, Guanine, Cytosine, Thymine

• Adenine, Guanine, Cytosine, Uracil

• Adenine, Guanine, Uracil, Thymine

• Adenine, Uracil, Cytosine, Thymine

Which nitrogenous base pairs are correct in DNA?

• Adenine with Guanine, Cytosine with Thymine

• Adenine with Thymine, Cytosine with Guanine

• Adenine with Cytosine, Guanine with Thymine

• Adenine with Uracil, Cytosine with Guanine

What type of bond holds the nitrogenous base pairs together?

• Covalent bonds

• Ionic bonds

• Hydrogen bonds

• Van der Waals forces

How many hydrogen bonds are between Adenine and Thymine?

• 1

• 2

• 3

• 4

How many hydrogen bonds are between Cytosine and Guanine?

• 1

• 2

• 3

• 4

What is the function of the sugar-phosphate backbone in a DNA molecule?

• To hold the nitrogenous bases together

• To allow the DNA molecule to replicate

• To provide structural support and protect the genetic information

• To facilitate the bonding between DNA and proteins

Which sugar is found in the nucleotides of DNA?

• Ribose

• Deoxyribose

• Glucose

• Fructose

What is the significance of the sequence of nitrogen bases in DNA?

• It determines the shape of the DNA molecule.

• It is random and has no biological significance.

• It encodes the genetic instructions for the development and functioning of living organisms.

• It only determines the color of the eyes and hair.