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Amoeba Sisters Video Recap: DNA Replication Answer Key
Why does DNA need to replicate before cells divide?
- ANSWER -So that each cell has a full copy of
DNA
Deoxyribose (sugar). Total number in image? -
ANSWER -6
Nitrogenous base. Total number in image? -
ANSWER -6
Hydrogen bond. Total number in image? -
ANSWER -3
Phosphate - ANSWER -Depicted as a green
circle on DNA diagram
3. Helicase: - ANSWER -Enzyme that unzips
the the double stranded DNA by breaking the
hydrogen bonds holding the bases together
DNA Polymerase: - ANSWER -Enzyme that
builds a new DNA molecule by adding
complementary strands of DNA to the original,
unzipped DNA molecule
Primase: - ANSWER -Enzyme that synthesizes
a primer so DNA polymerase knows where to begin
working
Ligase: - ANSWER -Enzyme that binds or
"glues" fragments of DNA together
4. Helicase unwinds or unzips DNA strands -
ANSWER -
5. Primase tells the polymerase where to start -
ANSWER -
6. Polymerase builds new DNA using original DNA
strand - ANSWER -
7. Ligase - binds or "glues" fragments of new DNA to
old DNA - ANSWER -
8. Explain what is meant by the "lagging" strand and
why this occurs. - ANSWER -It replicates at a
slower pace because it is being replicated in the
opposite direction of the replication fork.
