Take this Exam: A-Level Biology: DNA, RNA and ATP | Zestly

Question 1

What is the primary role of DNA helicase during the process of DNA replication?

Accepted Answer

To break hydrogen bonds between complementary bases.

Question 2

What is the function of ATP synthase in the context of cellular metabolism?

Accepted Answer

It catalyses the phosphorylation of ADP to form ATP.

Question 3

In the structure of a DNA nucleotide, which carbon atom of the pentose sugar is attached to the nitrogenous base?

Accepted Answer

Carbon 1

Question 4

Which of the following statements accurately describes the role of DNA polymerase?

Answer

It initiates the replication process by creating a primer.

Answer

It adds nucleotides to the 3' end of the growing DNA strand.

Answer

It catalyses the formation of phosphodiester bonds between adjacent nucleotides.

Answer

It proofreads the DNA by removing the entire strand if a mismatch is found.

Question 5

How does the structure of ATP make it a suitable energy source?

Answer

The bonds between the phosphate groups are unstable and have low activation energy.

Answer

It is a large molecule that can store vast amounts of energy for long periods.

Answer

It is easily transported across cell membranes to where energy is required.

Answer

It contains a ribose sugar which is highly reactive.