DNA Structure

What is the shape of the DNA molecule?

• Linear

• Double helix

• Circular

• Triple helix

Which of the following base pairs is found in DNA?

• Adenine - Uracil

• Cytosine - Guanine

• Thymine - Uracil

• Adenine - Cytosine

Who are credited with the discovery of the double helix structure of DNA?

• Charles Darwin and Alfred Wallace

• James Watson and Francis Crick

• Gregor Mendel and Rosalind Franklin

• Linus Pauling and Maurice Wilkins

What is the primary function of DNA in cells?

• To store energy

• To catalyze chemical reactions

• To store genetic information

• To transport molecules

Explain how the base pairing rules contribute to the structure of DNA.

• They allow DNA to form a double helix by pairing adenine with thymine and cytosine with guanine.

• They prevent DNA from forming a double helix.

• They allow DNA to form a triple helix by pairing adenine with guanine and cytosine with thymine.

• They have no effect on the structure of DNA.

Describe the role of Rosalind Franklin in the discovery of DNA's structure.

• She discovered the base pairing rules.

• She provided X-ray diffraction images that were critical to understanding the DNA structure.

• She was the first to isolate DNA.

• She developed the theory of evolution.

How does the sequence of bases in DNA determine the function of a gene?

• The sequence of bases determines the sequence of amino acids in a protein, which determines the protein's function.

• The sequence of bases has no effect on gene function.

• The sequence of bases determines the number of chromosomes.

• The sequence of bases determines the cell's energy level.

Evaluate the impact of the discovery of DNA's structure on modern biology.

• It had little impact on modern biology.

• It revolutionized our understanding of genetics and led to advances in biotechnology and medicine.

• It only affected the study of plants.

• It disproved the theory of evolution.

Predict how a mutation in the DNA sequence might affect an organism.

• It will always result in a beneficial trait.

• It may result in a change in the protein produced, potentially leading to a genetic disorder or variation.

• It will have no effect on the organism.

• It will always result in a harmful trait.

Analyze the significance of Chargaff's rules in understanding DNA structure.

• Chargaff's rules were irrelevant to DNA structure.

• Chargaff's rules helped establish that adenine pairs with thymine and cytosine pairs with guanine, supporting the double helix model.

• Chargaff's rules suggested that DNA was a single-stranded molecule.

• Chargaff's rules indicated that DNA was composed of proteins.