Scoring Guide
Item
1:
Answers:
True because the ratios of adenine and guanine are very similar as
is the ratio between thymine and cytosine.
It is expected for the pairing bases to be of relatively equal
amounts.
Scoring:
2
elements=2 points
1
element=1 point
other=0
points
Item
2:
Answer:
False because different organisms can different amounts of each of the
nucleotides.
Scoring:
2
elements=2 points
1
element=1 point
other=0
points
Item
3:
Answer:
followed by the synthesis of the new strand, using the ‘old’
strand as a template
Scoring:
2
elements=2 points
1
element=1 point
other=0
points
Item
4:
Answer:
Genes are instruction manuals for our bodies.
They are the directions, the “blueprint”, for building all the
proteins that make our bodies function.
Each gene in the DNA encodes information about how to make an individual
protein. Genes are found on the chromosomes, and contain the
hereditary information.
Scoring:
3
elements=3
2
elements=2 points
1
element=1 point
other=0
points
Item
5:
Answer:
The Watson and Crick model for a DNA molecule suggests the following:
adenine pairs with thymine and cytosine pairs with guanine
composed
of two strands made up of nucleotides
the
strands are twisted into a helix
each
nucleotide is composed of phosphate groups, deoxyribose sugar, nitrogenous
base.
Scoring:
3
elements=3
2
elements=2 points
1
element=1 point
other=0
points
Item
6:
Answer:
C. DNA
Scoring:
1
element=1 point
other=0
points
Item
7:
Answer:
B. Uracil
Scoring:
1
element=1 point
other=0
points
Item
8:
Answer:
A. Semi-conservative
Scoring:
1
element=1 point
other=0
points
Item
9:
Answer:
C. Converting all measurements to metric units
Scoring:
1
element=1 point
other=0
points