DNA Structure (Function)

What kind of bonds hold together the nitrogenous bases at the center of the double helix structure?

• covalent bonds

• hydrogen bonds

• ionic bonds

What are the correct base pairs?

• A and G, C and T

• A and C, G and T

• C and G, A and T

• A and A, G and G, C and C, T and T

Tags

NGSS.HS-LS1-1

Whose work in X-ray diffraction revealed the double helix structure of DNA?

• Rosalind Franklin

• James Watson

• Francis Crick

• Maurice Wilkins

Tags

NGSS.HS-LS1-1

What enzyme works to break the hydrogen bonds between bases and "unzip" the double helix?

• primase

• polymerase

• helicase

• ligase

What enzyme adds free floating nucleotides to the original strand and checks for errors?

• polymerase

• helicase

• ligase

• primase

The strands of a DNA molecule run anti-parallel to each other. The new DNA strand is always assembled in this direction:

• from 5' to 3'

• from 3' to 5'

What enzyme helps join together the Okazaki fragments on the lagging strand as it is assembled?

• ligase

• polymerase

• primase

• helicase

Whose discovery about base ratios led to the rule of base pairing?

• Rosalind Franklin

• Watson and Crick

• Erwin Chargaff

• Maurice Wilkins

Who built the model of DNA that helped scientists understand how DNA could replicate?

• Rosalind Franklin and Maurice Wilkins

• James Watson and Maurice Wilkins

• Francis Crick and Erwin Chargaff

• James Watson and Francis Crick

Tags

NGSS.HS-LS1-1

Why can bacteria recognize a human gene and then produce a human protein?

• Cell division in bacteria and humans is the same.

• Bacterial cells contain the same organelles as human cells.

• The basic DNA components are the same in humans and bacteria.

• Bacteria and human cells have the same number of chromosomes.

Tags

NGSS.HS-LS1-1