DNA Structure and Replication

Which shows the correct complementary base pairing for DNA?

• C-A, T-G
• A-G, C-T
• C-G, U-A
• T-A, G-C

The model of the double-helix model of the DNA molecule resembles a twisted ladder What makes up the rungs of the twisted ladder?

• paired phosphate groups
• paired nitrogen bases
• paired sugars
• hydrogen and oxygen atoms

The sequence of nitrogenous bases on a portion of a strand of DNA is shown in the diagram. From left to right, what is the corresponding sequence of the complimentary strand

• C C A C T G A
• G G U G T A T
• G G T G A C T
• T T A G A T C

In the DNA molecule, ____ pairs with A and _______ pairs with G

• T, C
• C, T
• A, G
• G, T

Which 2 molecules form the sides (backbone) of the DNA ladder?

• Sugar and Phosphate
• Phosphate and Nucleotide
• Nitrogenous base and Nitrogenous base
• Nitrogenous base and Sugar

The drawing shows the structure of what molecule?

• A DNA molecule
• A lipid molecule
• A carbohydrate molecule
• A protein molecule

Why is DNA important?

• Its in everything
• It serves as the blueprint for all living things
• Because it is our primary energy source when we eat food
• It provides structure for the cell

"X" outlines a...

• Sugar
• Phosphate
• Nitrogen base
• Nucleotide

Which 2 molecules form the sides (backbone) of the DNA ladder?

• Sugar and Phosphate
• Phosphate and Nucleotide
• Nitrogenous base and Nitrogenous base
• Nitrogenous base and Sugar

What are the chemical components of a DNA nucleotide? _______

• Sugar, Phosphate, Nitrogenous Base
• Phosphate, Sugar, Amino Acid
• Nitrogenous Base, Sugar, Amino Acid
• Nitrogenous Base, Amino Acid, ATP