Download DNA Replication Worksheet

Name ____________________________________________ Date ______________ Per ______
DNA Replication Worksheet
1. Why does DNA replicate?
2. Why is DNA replication described as semi-conservative? Explain.
3. What is the role of enzymes in DNA replication? (p. 299)
4. When does DNA replication occur in a cell? (Refer to the phases of the cell cycle, p. 245)
5. Where does DNA replication occur in a cell?
True/False – Circle T or F. If the statement is false, CORRECT the underlined word(s) to make it true.
6. T or F - Cytosine, guanine, thymine and adenine are referred to as phosphates._________________________
7. T or F – DNA is in the shape of a double helix. __________________________
8. T or F – A nucleotide is made up of a sugar, phosphate and two nitrogen bases. _______________________________
9. T or F – Replication takes place prior to cell division. ___________________________
10. T or F – Adenine always pairs with Guanine. ____________________________
11. T or F – Complementary base pairing matches up complementary sugars.____________________________
12. T or F – The sides of the DNA molecule are made up of repeating nitrogen bases and sugars. ___________________
13. T or F – The letters that make up the DNA molecule code for proteins. ____________
14. T or F – Replication results in two strands of DNA, each of which has one of the original strands. _______________
15. T or F – Covalent bonds hold nitrogen bases together, forming the steps of the DNA ladder. ____________________
16. Sentence Arrange – Put the steps of DNA replication in the correct order by writing a number in the
space before each statement. (1-4)
______ Two new, identical molecules of DNA are formed.
______ Helicase begins to break the hydrogen bonds between nitrogen bases to unzip the DNA.
______ Cell can begin the M-phase, or mitosis phase, of the cell cycle.
______ Free floating nucleotides pair up with exposed nitrogen bases and are attached by DNA polymerase.
Complete the statement
17. _____________________________, guanine, cytosine, and thymine are the four nitrogen bases.
18. In DNA, _____________________________ always forms hydrogen bonds with guanine.
19. The sequence of _____________________________ carries the genetic information of an organism
20. The process of __________________________ produces a new copy of an organism’s genetic information.
21. The coiled shape of DNA is called a ____________________
____________________.
Neatly color the picture. Use the key at the bottom of the page for coloring guide.
Replication of DNA
See below for
color guide!
N
N
KEY
O= Old Deoxyribose-Phoshphate backbone - BLUE
N= New Deoxyribose-Phosphate backbone – ORANGE
A= Adenine - GREEN
T= Thymine - YELLOW
G= Guanine - RED
C= Cytosine - PURPLE
D= Replication fork - color the arrow BROWN