DNA Scientists Practice

According to Chargaff's Rule, if a DNA strand contains 16% Adenine, what are the percentages of the other three bases in the strand?

• 16% Thymine, 34% Guanine, 34% Cytosine

• 84% Thymine, 16% Guanine, 84% Cytosine

• 16% Thymine, 16% Guanine, 16% Cytosine

• 34% Thymine, 16% Guanine, 34% Cytosine

Answer explanation

Adenine % = Thymine %, Cytosine % = Guanine %. The sum of the four bases must add up to 100%.

Which DNA scientist(s) used x-ray diffraction to discover that the structure of DNA is a double helix?

• Watson & Crick

• Hershey & Chase

• Franklin

• Griffith

Which DNA scientist(s) stained phosphorus and sulfur atoms with a radioactive substance to determine whether DNA or protein contains the genetic material?

• Griffith

• Boveri & Sutton

• Hershey & Chase

• Watson & Crick

Boveri & Sutton conducted experiments that helped them establish which DNA theory?

• Chromosome Theory: specific genes are on specific chromosomes

• Theory of Base Pairings & Percentages: A=T and C=G

• Gene Expansion Theory: traits can be passed down on the X chromosome

• Theory of Non-modal DNA: nitrogenous bases have a specific sequence with randomized patterns

Which scientist(s) created the first 3D model of DNA?

• Franklin

• Morgan

• Watson & Crick

• Griffith

Which DNA scientist(s) investigated how virulent and non-virulent bacteria impact mouse survivability?

• Hershey & Chase

• Chargaff

• Morgan

• Griffith

Which DNA scientist(s) is/are credited with PROVING that DNA is the genetic material rather than proteins?

• Griffith

• Watson & Crick

• Boveri & Sutton

• Hershey & Chase

Which DNA scientist(s) studied fruit flies and discovered that specific traits can be passed down on the X chromosome?

• Boveri & Sutton

• Chargaff

• Morgan

• Franklin

According to Chargaff's rule, if a strand of DNA contains 48% Guanine, what is the percentage of Thymine in the strand?

• 2%

• 48%

• 52%

• 24%