)
AQA
A-Level
BIOLOGY
3.1 | Biological Molecules
1.5 Nucleic Acids - Structure and Replication
Time allowed
58 minutes
MARK SCHEME
Score Percentage
/48 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, (a) Box around single nucleotide.
1
(b)
DNA Percentage of each base
strand
A C G T
Strand 1 (16) 34 21 29
Strand 2 29 (21) (34) 16
2 rows correct = 2 marks;
1 row correct = 1 mark.
2
(c) 1. Reference to DNA polymerase;
2. (Which is) specific;
3. Only complementary with / binds to 5’ end (of strand);
Reject hydrogen bonds / base pairing
4. Shapes of 5’ end and 3’ end are different / description of how different.
4
[7]
AQA
A-Level
BIOLOGY
3.1 | Biological Molecules
1.5 Nucleic Acids - Structure and Replication
Time allowed
58 minutes
MARK SCHEME
Score Percentage
/48 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, (a) Box around single nucleotide.
1
(b)
DNA Percentage of each base
strand
A C G T
Strand 1 (16) 34 21 29
Strand 2 29 (21) (34) 16
2 rows correct = 2 marks;
1 row correct = 1 mark.
2
(c) 1. Reference to DNA polymerase;
2. (Which is) specific;
3. Only complementary with / binds to 5’ end (of strand);
Reject hydrogen bonds / base pairing
4. Shapes of 5’ end and 3’ end are different / description of how different.
4
[7]
