DNA Structure and Replication

Front

What forms the sides (backbone) of the DNA ladder?

Back

Deoxyribose sugar and phosphate.

Front

In which phase of the cell cycle does DNA replication occur?

Back

S-phase.

Front

What must occur with DNA before a cell can undergo division (mitosis)?

Back

DNA replication.

Front

Why is DNA replication considered semi-conservative?

Back

Each resulting DNA molecule has one new strand and one original strand.

Front

What are the components of the sides of the DNA ladder?

Back

Alternating sugar and phosphate.

Front

What is the structure of DNA?

Back

DNA is a double helix composed of two strands of nucleotides.

Front

What are nucleotides made of?

Back

A phosphate group, a deoxyribose sugar, and a nitrogenous base.

Front

What are the four nitrogenous bases in DNA?

Back

Adenine (A), Thymine (T), Cytosine (C), and Guanine (G).

Front

How do nitrogenous bases pair in DNA?

Back

Adenine pairs with Thymine, and Cytosine pairs with Guanine.

Front

What enzyme is responsible for unwinding the DNA double helix during replication?

Back

Helicase.