Exploring DNA Structure and Discovery

Which of the following correctly describes the structure of a nucleotide in DNA?

• A phosphate group, a ribose sugar, and a nitrogenous base

• A phosphate group, a deoxyribose sugar, and a nitrogenous base

• A phosphate group, a glucose sugar, and a nitrogenous base

• A phosphate group, a fructose sugar, and a nitrogenous base

What is the significance of Rosalind Franklin's X-ray diffraction images in understanding DNA structure?

• They showed that DNA is composed of amino acids.

• They provided evidence that DNA is a double helix.

• They demonstrated that DNA is a single-stranded molecule.

• They revealed that DNA is made of proteins.

Which base pairs with adenine in DNA according to the base pair rules?

• Cytosine

• Guanine

• Thymine

• Uracil

How do the base pair rules contribute to the structure of the DNA double helix?

• They allow DNA to form a triple helix.

• They ensure that the two strands of DNA are parallel.

• They ensure that the two strands of DNA are complementary.

• They allow DNA to form a single strand.

Which of the following statements about the sugar in DNA is correct?

• It is a ribose sugar.

• It is a deoxyribose sugar.

• It is a glucose sugar.

• It is a sucrose sugar.

Which of the following pairs of nitrogenous bases are correctly matched according to the base pair rules?

• Adenine and Guanine

• Cytosine and Thymine

• Adenine and Thymine

• Guanine and Thymine

What is the primary function of the phosphate group in a DNA nucleotide?

• To provide energy for DNA replication

• To form the backbone of the DNA strand

• To bond with nitrogenous bases

• To act as a catalyst in DNA synthesis

Which of the following best describes the role of hydrogen bonds in the structure of DNA?

• They connect the phosphate groups to the sugars.

• They hold the two strands of the double helix together.

• They link the sugars to the nitrogenous bases.

• They form the backbone of the DNA strand.

Which of the following is a correct statement about the nitrogenous bases in DNA?

• Adenine pairs with cytosine.

• Guanine pairs with thymine.

• Cytosine pairs with guanine.

• Thymine pairs with uracil.

Monomer (subunit) of nucleic acids made up of a 5-carbon sugar, a phosphate group, and nitrogenous base.

• Nucleus

• Carbohydrate

• Nucleotide

• Phosphate group