DNA Structure

Multiple Choice

A scientist extracts DNA from different organisms. Which explanation best describes why DNA is essential for life?

• It stores genetic instructions for living organisms.

• It provides energy for cellular processes.

• It breaks down nutrients in the cell.

• It transports oxygen in the blood.

Multiple Choice

A scientist studies a specific section of DNA that controls hair texture.
Question: What is this section called, and why is it important?

• The section is called a gene, specifically a hair texture gene.
• The section is called a protein, which influences skin pigmentation.
• The section is called a nucleotide, and it regulates blood type.
• The section is called a chromosome, which determines eye color.

Open Ended

How do hydrogen bonds help maintain the structure and stability of the DNA double helix? Explain your answer.

Multiple Choice

Which of the following base pairs are correct according to DNA base pairing rules?

• A-T, C-G

• A-G, T-C

• A-C, G-T

• A-T, G-G

Multiple Select

Which of the following statements about DNA base pairing are correct? Pick 2

• Adenine pairs with Thymine.

• Cytosine pairs with Guanine.

• Adenine pairs with Cytosine.

• Thymine pairs with Guanine.

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Multiple Choice

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

• cytosine
• guanine
• thymine
• uracil

Multiple Choice

Two students are discussing why people have different eye colors even though everyone’s DNA is made of the same molecules.
Question: Which explanation is correct?

• Eye color is determined solely by environmental factors.
• The order of nucleotides in each person’s DNA is different.

• All humans have the same eye color at birth.
• Eye color differences are caused by the amount of oxygen in the blood.