DNA Practice Quiz #2
X
1. Give the proper name for the sugar molecules found in
this molecule.
2. How many total nitrogenous bases are found within this
diagram?
3. What percent of these bases is GUANINE?
4. What percent of these bases is ADENINE?
5. What percent of these bases is CYTOSINE?
6. What is the "X" pointing to?
ANSWER KEY:
1. As it is Double Stranded it must be DNA. DNA
nucleotides all possess "DEOXYRIBOSE" Sugar
2. There are a total of 8 nitrogenous bases (green
molecules)
3. Any time we have two bases linked together with 3
Hydrogen bonds it must be C-G with 3. Therefore there
are 3 Guanines. 3 of 8 bases are Guanine, so that is
37.5% of the bases are Guanines
4. Any time we have two bases joined together with 2
Hydrogen bonds it must be T-A with 2. So there is only
one Adenine in the diagram. So 1 out of 8 bases are
Adenine, so that is 12.5 %.
5. If there are 3 Guanines there must be 3 Cytosines. So if
there was 37.5% Guanine there must be 37.5%
Cytosine.
6. The "X" is pointing to a "PHOSPHATE" Group.