BIOLOGY- THE SCIENCE OF LIFE:
DNA: THE MASTER MOLECULE OF LIFE
(15:20 min)
NAME ___________________________________
1. All living things are made from ____________________
2. Explain why they say the genetic code is “universal”.
3. DNA is found in the organelle called the _____________________ in the
structures called the _______________________.
4. DNA is a twisted large macromolecule called the
_____________________________.
5. There are 4 different nucleotides in DNA. There is a ________________
nucleotide, a _______________ nucleotide, a ________________ nucleotide,
and a ________________ nucleotide.
6. A nucleotide = _________________, _________________, and
________________
7. Name the sugar of DNA
_________________________________________________
8. Strong chemical bonds hold the backbones of the DNA structure together (the
sugars and phosphates). Why is this important?
9. Weak hydrogen bonds hold the nitrogenous bases together (A to T, C to G).
Why is this important?
10. When we say DNA has a complementary strand, what do we mean?
11. What is the key to the genetic code or what makes individuals different?
12. Proteins are basically a chain of _______________________.
13. Proteins do the following things:
a.
b.
c.
14. How many combinations (codons) of 3-bases are possible? _________
15. Define DNA replication:
16. What is the cell going to eventually do after the DNA replicates?
17. List 3 different points of RNA compared to DNA:
RNA HAS TH FOLLOWING:
a.
b.
c.
18. What is the DNA “alphabet”?
19. What switches genes on and off? [DNA makes or stops making a particular
protein]