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Transcript
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