3 DNA replication - Higher Human Biology

Front

What enzyme is responsible for forming sugar-phosphate bonds between nucleotides in a DNA strand?

Back

DNA polymerase

Front

What are the base pairing rules in DNA?

Back

Adenine pairs with Thymine, and Guanine pairs with Cytosine.

Front

How are the leading and lagging strands of DNA oriented during replication?

Back

They are anti-parallel.

Front

Why can't both strands of DNA be replicated continuously?

Back

DNA nucleotides can only be added to the 3' end of the new DNA strand.

Front

Which enzyme is not required for DNA replication?

Back

Amylase.

Front

What is the role of helicase in DNA replication?

Back

Helicase unwinds the DNA double helix.

Front

What is the function of ligase in DNA replication?

Back

Ligase joins Okazaki fragments on the lagging strand.

Front

What is the significance of the 5' to 3' direction in DNA replication?

Back

DNA strands are synthesized in the 5' to 3' direction, which is crucial for replication.

Front

What are Okazaki fragments?

Back

Short segments of DNA synthesized on the lagging strand during replication.

Front

What is the difference between the leading strand and the lagging strand?

Back

The leading strand is synthesized continuously, while the lagging strand is synthesized in short segments.