Exploring DNA Structure and Replication

Look at the DNA molecule shown at right. What does it look like?

Based on this picture, how do you think a DNA molecule makes a copy of itself? (Hint: Look at the bottom two “rungs” of the ladder.)

What is the name for the components make up a DNA molecule?

• Nucleotide

• Amino Acid

• Protein

• Carbohydrate

How many different nitrogenous bases do you see?

• 2

• 3

• 4

• 5

What is the structure of DNA?

What makes up the sides of the DNA molecule?

What makes up the “rungs” of the DNA molecule?

Write the name of the nitrogenous base that joins to each of the bases below: Adenine (A) joins to

• Thymine

• Cytosine

• Guanine

• Uracil

Thymine (T) joins to

• Adenine

• Cytosine

• Guanine

• Uracil

Cytosine (C) joins to

• Adenine

• Thymine

• Guanine

• Uracil