DNA structure and replication

Front

What is the structure of a DNA molecule?

Back

A DNA molecule is best described as a double helix.

Front

What enzyme is responsible for joining Okazaki fragments on the lagging strand during DNA replication?

Back

The enzyme that joins Okazaki fragments together is called Ligase.

Front

In which direction does DNA polymerase read the DNA strand during synthesis?

Back

DNA polymerase reads the DNA strand in the 3' to 5' direction.

Front

What type of bonds hold the two complementary strands of DNA together?

Back

The two complementary strands of DNA are held together by hydrogen bonds.

Front

What term describes DNA that is coiled around proteins?

Back

DNA that is coiled around proteins is referred to as chromosomes.

Front

What are the building blocks of DNA?

Back

The building blocks of DNA are nucleotides.

Front

What are the three components of a nucleotide?

Back

A nucleotide consists of a phosphate group, a sugar (deoxyribose), and a nitrogenous base.

Front

What are the four nitrogenous bases found in DNA?

Back

The four nitrogenous bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G).

Front

What base pairs with adenine in DNA?

Back

In DNA, adenine pairs with thymine (A-T).

Front

What is the role of helicase in DNA replication?

Back

Helicase unwinds the DNA double helix, separating the two strands.