3 DNA replication - Higher Human Biology

What is the name for the basic units which make up strands of DNA?

• Phosphates

• Nucleotides

• Sugars

• RNA

What are the DNA base pairing rules?

• Adenine to Guanine, Cytosine to Thymine

• Adenine to Cytosine, Guanine to Thymine

• Adenine to Thymine, Guanine to Cytosine

The two strands of DNA are held together by which kind of bonds?

• Peptide bonds

• Strong bonds

• Hydrogen bonds

What are DNA nucleotides made up of?

• A deoxyribose sugar, phosphate and a base

• A ribose sugar, phosphate and base

• A deoxyribose sugar, phosphate and ATP

Which of these enzymes are not needed for DNA replication?

• Ligase

• Amylase

• DNA polymerase

Why can both strands of DNA not be replicated continuously?

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

• There is not enough space for both strands to be replicated

• There is only one enzyme therefore it can't replicate both strands at the same time

In DNA replication, the fragments of DNA which have been replicated discontinuously are joined together using what?

• Ligase

• DNA polymerase

• RNA polymerase

• Amylase

What are primers?

• Single stranded random sequences of nucleotides

• Single stranded sequences of nucleotides which are complementary to a target sequence

• Double stranded sequences of nucleotides which are complementary to a target sequence

How would we describe the direction of leading and lagging strand?

• Parallel

• Anti-parallel

Replication occurs _______ on the leading strand.

• Continuously

• Discontinuously