Name ______

UNIT 6 – DNA WS

I. DNA – Provide the correct letter(s) for each term. Each letter may be used more than once and there may be more than one correct

answer for each term. Please note: The larger rectangles represent double-ringed molecules, while the smaller rectangles represent

single-ringed molecules.

II. Matching – There may be more than 1 correct answer for each question; however each choice is only used 1 time!

______1. DNA wrapped in protein; humans have 46

______2. Disease-causing

______3. Scientist that took the x-ray of DNA that helped in the discovery of DNA’s structure

______4. Showed that bacteria were able to transform

______5. Biomolecule group to which DNA belongs

______6. Scientist that chemically proved base-pairing only occurred between certain nitrogen bases

______7. Five-carbon sugar found in DNA

______8. Identified “transforming substance” seen in bacteria as DNA

______9. Monomers of DNA

______10. Used viruses to prove DNA, not protein, contains the genetic code

______11. First identified structure of DNA

______12. Virus that infects bacteria

______13. Microtubules help separate chromosomes during mitosis

______14. The ability of bacteria to take up DNA from their environment

______15. Biomolecule group to which deoxyribose belongs

______16. Type of bond found between nitrogen bases

______18. Type of bond that holds components of nucleotides together

______19. Structure of DNA

______20. Undifferentiated cells; have the ability to develop into any cell

______21. Location of DNA in eukaryotic cell

______22. Location of DNA in prokaryotic cell

______24. Caused by uncontrolled cell division

______25. Phase of cell cycle where cells do most of their growing

______26. Enzyme used to break hydrogen; untwist & unzip DNA

III. Base-Pairing – Use base pairing rules to find the complementary strand of DNA

Strand of DNA nucleotides

/ Complementary Strand
1. GGCATTAC
2. AATTGGCC
3. CAGTAC / 4. TTTAGCCGA
5. AACGTGTACCA

IV. Replication – Label the diagram as directed then complete the paragraph below.

DNA replication occurs in the ______of eukaryotic cells during ______phase of the cell cycle. During this time, the DNA is in the form of ______. First, the ______bonds between the ______are split with the enzyme, ______, opening the double helix at points called ______. The enzyme, ______then moves in nucleotides according to ______rules, ______with ______and ______with ______. Synthesis always occurs in a ______to ______direction, so one new strand is synthesized continuously producing the ______strand; however the other strand is forming away from the ______fork. This strand is known as the ______strand and it is synthesized in short pieces known as ______. The fragments are then joined together by the enzyme, ______to form a continuous strand of nucleotides. Another ______follows and proofreads the newly synthesized strand of nucleotides. Each DNA molecule is composed of one ______strand and one ______strand. The two identical DNAs are known as ______. They are held together at the ______until ______of the cell cycle, at which time they are separated so that two ______cells can be produced, each with its own ______copy of DNA.