BIOLOGY PRACTICE EXAM

DNA replication creates two strands of DNA from one. If pink is parental DNA and blue is new DNA - which picture demonstrates the accepted model of DNA replication after the SECOND replication cycle?

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The picture below shows an enzyme unwinding and unzipping DNA.

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​What is the name of this enzyme?

• DNA Helicase

• DNA Ligase

• DNA polyermase

• RNA Polymerase

Which of the following DNA nucleotides are paired with the correct corresponding DNA nucleotide? (mark all that apply)

• Adenine with Thymine

• Guanine with Cytosine

• Thymine with Cytosine

• Adenine with Uracil.

• Uracil with Thymine

You are given the DNA strand 5'ATGCTCAGCTGA3'. What is the corresponding DNA strand?

• 5'UACGAGUCGACU3'

• 5'TACGAGTCGACT3'

• 3'UACGAGUCGACU5'

• 3'TACGAGTCGACT5'

Many enzymes are involved in DNA replication. Which is the correct order of enzymes involved in DNA replication from beginning to end?

• Helicase, DNA primase, DNA polymerase, Ligase

• RNA primase, Helicase, DNA polymerase, Ligase

• Helicase, RNA primase, DNA polymerase, Ligase

• DNA primase, Helicase, RNA polymerase, Ligase

Which is the role of DNA polymerase?

• Unwinds the original DNA strand

• Lays down RNA primer for new nucleotide bases.

• Builds new strands by bringing in new nucleotide bases.

• Remove Okazaki fragments for new nucleotides.

Which is the last step of DNA replication?

• RNA Helicase unwinds original DNA strand

• DNA Primase lays down RNA primer for new nucleotide bases.

• RNA polymerase builds new strands by bring in new nucleotide bases.

• Ligase knits together fragments on lagging strand

Which letter in the picture below depicts the leading strand in DNA replication?

• A

• C

• B

• None of the above

Which letter in the picture below depicts the lagging strand in DNA replication?

• Letter A since it is copied from 5' to 3'

• Letter A since it is copied from 3' to 5'

• Letter B since it is copied from 3' to 5

• Letter B since it is copied from 5' to 3'

Which letter in the given picture depicts the okazaki fragments?

• A - lagging strand

• C - leading strand

• B - lagging strand

• C - replication fork