What is the structure of DNA?

• Single helix

• Double helix

• Triple helix

• Quadruple helix

Which base pairs with adenine (A) in DNA?

• Cytosine (C)

• Guanine (G)

• Thymine (T)

• Uracil (U)

The process by which a cell makes a copy of its DNA before division is called ___.

Who were the scientists credited with discovering the structure of DNA?

• Watson and Crick

• Franklin and Wilkins

• Mendel and Darwin

• Pauling and Chargaff

Which statement best explains how this example reflects the nature of science?

• A) Scientific discoveries are made by one person working alone.

• B) Scientific knowledge is always complete and never changes.

• C) Scientific ideas are based on evidence and often built through collaboration. They are also constants being updated.

• D) Scientific models do not need to be tested once they are accepted.