Download DNA - NylandBiology2012-2013

DNA: The Molecule of Heredity
Name________________________
1. A nucleotide is made of three parts: a ___________________ group, a five carbon
__________________, and a nitrogen containing _____________________
2. In a single strand of DNA, the phosphate group binds to the __________________
of the next group.
3. Chromosomes consist of what two substances: ____________________ &
______________________
4. _________________ and __________________ are connected by two hydrogen
bonds, whereas _______________ and ___________________ are connected by three
hydrogen bonds.
5. Purines have _________ rings, and pyrimidines have ____________ ring.
6. _________________is the relaxed form of DNA.
7. DNA must replicate so that a cell can _________________________.
8. Chargaff's rule states that the DNA of any species contains equal amounts of
__________________ & ____________ and also equal amounts of
__________________ & ____________________
9. In DNA, thymine is complementary to ________________ ; cytosine is
complementary to _____________
10. In a strand of DNA, the percentage of thymine is 30 %. What is the percentage of
cytosine in the same DNA strand? _________________
11. Number the steps of DNA replication in the correct order (1, 2, 3)
_______Daughter strands are formed using complementary base pairing.
______ DNA unwinds
______ The DNA of the daughter strands winds with together with its parent strand.
12. Why is DNA replication called "semi-conservative"?
__________________________________________
13. What enzyme unwinds are unzips the parent strand? ________________
14. What enzyme synthesizes the new DNA strand? _______________________
15. The two sides of the DNA helix are held together by
________________________
16. Write out the complete name for DNA:
__________________________________________
17. In Figure 12-5, use the letter P to label all of the phosphate groups. Use an S to
label all the sugar molecules. For labeling the nitrogen bases, use a T for thymine
and a C for cytosine. Guanine and adenine have been filled in for you. Circle and
label a nucleotide.
Figure 12-5
17. Why, when and how does DNA replication take using the following terms:
DNA replication, cell division, nucleus, hydrogen bonds, adenine, cytosine,
thymine and guanine, helicase, unzips, nucleotides, new strand, original
strand, semi-conservative replication, binding, DNA polymerase.
18. What is A?______________________________
19. What is B?______________________________
20. What is the entire drawing and what is made of?____________________
__________________________