AQA
A-Level
BIOLOGY
3.1 | Biological Molecules
1.4 |Protein and Enzymes
Time allowed
62 minutes
MARK SCHEME
Score Percentage
/52 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, (a) Deoxyribose.
1
(b) 1. Thymine 18 (%);
2. Guanine 32 (%).
2
(c) DNA polymerase.
1
(d) 1. (Figure 1 shows) DNA has antiparallel strands / described;
2. (Figure 1 shows) shape of the nucleotides is different / nucleotides
aligned differently;
3. Enzymes have active sites with specific shape;
4. Only substrates with complementary shape / only the 3’ end can bind
with active site of enzyme / active site of DNA polymerase.
4
[8]
A-Level
BIOLOGY
3.1 | Biological Molecules
1.4 |Protein and Enzymes
Time allowed
62 minutes
MARK SCHEME
Score Percentage
/52 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, (a) Deoxyribose.
1
(b) 1. Thymine 18 (%);
2. Guanine 32 (%).
2
(c) DNA polymerase.
1
(d) 1. (Figure 1 shows) DNA has antiparallel strands / described;
2. (Figure 1 shows) shape of the nucleotides is different / nucleotides
aligned differently;
3. Enzymes have active sites with specific shape;
4. Only substrates with complementary shape / only the 3’ end can bind
with active site of enzyme / active site of DNA polymerase.
4
[8]
