IB HL2 DNA Replication Quiz

DNA replication results in two DNA molecules,

• each one with two original strands
• each one with two new strands
• each one with one new strand and one original strand
• one with two new strands and the other with two original strands

A scientist observes a base sequence of AGCTAGCTAGCT.  Which of the following would be the complimentary strand?

• TGCATGCATGCA
• TCGATCGATCGA
• TAGCTAGCTAGC
• TTAAGGCCTTCC

The bonds that hold the two strands of DNA together come from...

• the attraction of phosphate groups 
• strong bonds between  bases and sugars
• carbon to carbon bonds in the sugar
• weak hydrogen bonds between the bases

The DNA nucleotide is composed of three parts. Which two components make up the nucleotide backbone?

• ribose sugar and base
• ribose sugar and phosphate group
• nitrogen base and deoxyribose sugar
• deoxyribose sugar and phosphate group
  

After analyzing a sample of DNA, a scientist recorded the data shown in the table. What percentage of the DNA sample is cytosine?

• 22%
• 25%
• 28%
• 56%

This enzyme is capable of breaking Hydrogen bonds found between the bases of DNA

• Topoisomerase

• DNA Helicase

• DNA Polymerase

• Exonuclease

Which enzyme seals okazaki fragments together on the lagging strand?

• Topoisomerase
• Helicase
• Polymerase
• Ligase

What do we call DNA replication since new DNA has 1 parent strand and 1 new strand?

• Conservative 
• Semiconservative 
• Dispersive

The separation of the two single strands of DNA creates a ‘Y’ shape?

• enzyme

• unzip

• A replication fork

This enzyme helps helicase unzip DNA by relieving supercoiling

• DNA Gyrase (Topoisomerase)

• Exonuclease

• DNA Primase

• DNA Polymerase 3