Download nitrogen bases

Name:___________________________________________
Date:_____________________ Period:______
DNA KEY
Part I: DNA Structure
1. Label boxes a-d using the terms: Nitrogen base, Nucleotide, Deoxyribose (sugar),
and Phosphate. Use your DNA Guided Notes.
c. Deoxyribose (Sugar)
a. Nitrogen base
T
C
d. Phosphate
b. Nucleotide
C
T
2. Fill in the missing bases on the DNA molecule above. Remember how they pair.
Part II: DNA Concept Map
Fill in the concept map with the correct terms. Use your DNA Guided Notes.
1. Adenine (A)
DNA is made of
4 nitrogen bases
2. Thymine (T)
3. Guanine (G)
4. Cytosine (C)
It is in the shape of a
Double helix
The sides of the
ladder are made of
Phosphate
The steps of the
ladder are made of
nitrogen base pairs
Sugar
A pairs with T
G pairs with C
Assignments
Name:___________________________________________
Date:_____________________ Period:______
Part III: How Does DNA lead to Traits?
Directions:
1. Read the boxes and fill in the missing words. Use your DNA Guided Notes.
2. After, color code the DNA molecule using the key below.
The specific order of bases along a DNA molecule
forms a “word.” This is called a G E N E
When the ribosome reads this word it is able to
make a P R O T E I N
This protein gives an organism a specific
characteristic called a T R A I T
blue
purple
red
orange
yellow
green
If a portion of the DNA is changed we call this a
MUTATION
This change is a “spelling mistake.” Will the cell
be able to make the correct version of the
protein: YES or NO? NO
COLOR CODE THE DNA MOLECULE
Assignments