10/17/24, 4:35 PM AS Biology (7401/2) Paper 2 Specimen 2014/AQA AS BIOLOGY 7401/2 Paper 2 Version Final Marking Scheme/ 2024-2025 …
AS Biology (7401/2) Paper 2 Specimen
2014/AQA AS BIOLOGY 7401/2 Paper 2 Version
Final Marking Scheme/ 2024-2025 update
Terms in this set (31)
01 . 1) A student 1. Push hard - spread/squash tissue;
investigated mitosis in the 2. Not push sideways - avoid rolling cells
tissue from an onion root together/breaking chromosomes;
tip.
The student prepared a
temporary mount of the
onion tissue on a glass
slide. She
covered the tissue with a
cover slip. She was then
given the following
instruction.
"Push down hard on the
cover slip, but do not
push the cover slip
sideways."
Explain why she was
given this instruction.
[2 marks]
https://quizlet.com/958652550/as-biology-74012-paper-2-specimen-2014aqa-as-biology-74012-paper-2-version-final-marking-scheme-2024-202… 1/17
,10/17/24, 4:35 PM AS Biology (7401/2) Paper 2 Specimen 2014/AQA AS BIOLOGY 7401/2 Paper 2 Version Final Marking Scheme/ 2024-2025 …
01 . 2) The student No (no mark)
concluded that the cell in Yes (no mark)
Figure 1 was in the 1. Chromosomes/chromatids are (in two groups)
anaphase stage of at poles of spindle/at ends of spindle;
mitosis. 2. V-shape shows that (sister) chromatids have
Was she correct? Give been pulled apart at their centromeres/that
two reasons for your centromeres of (sister) chromatids have been
answer. pulled apart;
[2 marks]
01 . 3) The student 28.;
counted the number of
cells she observed in
each stage of mitosis.
Of the 200 cells she
counted, only six were in
anaphase.
One cell cycle of onion
root tissue takes 16 hours.
Calculate how many
minutes these
cells spend in anaphase.
Show your working.
[2 marks]
https://quizlet.com/958652550/as-biology-74012-paper-2-specimen-2014aqa-as-biology-74012-paper-2-version-final-marking-scheme-2024-202… 2/17
, 10/17/24, 4:35 PM AS Biology (7401/2) Paper 2 Specimen 2014/AQA AS BIOLOGY 7401/2 Paper 2 Version Final Marking Scheme/ 2024-2025 …
02 . 2) A scientist 0.22;
investigated the uptake
of sodium ions by animal
tissue.
To do this, he:
• used two flasks, F and G
• put equal masses of
animal tissue into each
flask
• added equal volumes of
a solution containing
sodium ions to each flask
• added to flask F a
solution of a substance
that prevents the
formation of ATP by
cells
• measured the
concentration of sodium
ions remaining in the
solution in each
flask.
Figure 2 shows his results.
Calculate the rate of
uptake of sodium ions by
the tissue in flask G
during the first
20 minutes of this
investigation.
[1 mark]
02 . 2) The scientist 1. Uptake in flask G much greater than in flask F;
concluded that the cells 2. Showing use of ATP in flask G;
in flask G took up sodium 3. Sodium ion concentration in flask G falls to
ions by active zero;
transport. Explain how 4. Showing uptake against a concentration
the information given gradient;
supports this conclusion.
[4 marks]
https://quizlet.com/958652550/as-biology-74012-paper-2-specimen-2014aqa-as-biology-74012-paper-2-version-final-marking-scheme-2024-202… 3/17
AS Biology (7401/2) Paper 2 Specimen
2014/AQA AS BIOLOGY 7401/2 Paper 2 Version
Final Marking Scheme/ 2024-2025 update
Terms in this set (31)
01 . 1) A student 1. Push hard - spread/squash tissue;
investigated mitosis in the 2. Not push sideways - avoid rolling cells
tissue from an onion root together/breaking chromosomes;
tip.
The student prepared a
temporary mount of the
onion tissue on a glass
slide. She
covered the tissue with a
cover slip. She was then
given the following
instruction.
"Push down hard on the
cover slip, but do not
push the cover slip
sideways."
Explain why she was
given this instruction.
[2 marks]
https://quizlet.com/958652550/as-biology-74012-paper-2-specimen-2014aqa-as-biology-74012-paper-2-version-final-marking-scheme-2024-202… 1/17
,10/17/24, 4:35 PM AS Biology (7401/2) Paper 2 Specimen 2014/AQA AS BIOLOGY 7401/2 Paper 2 Version Final Marking Scheme/ 2024-2025 …
01 . 2) The student No (no mark)
concluded that the cell in Yes (no mark)
Figure 1 was in the 1. Chromosomes/chromatids are (in two groups)
anaphase stage of at poles of spindle/at ends of spindle;
mitosis. 2. V-shape shows that (sister) chromatids have
Was she correct? Give been pulled apart at their centromeres/that
two reasons for your centromeres of (sister) chromatids have been
answer. pulled apart;
[2 marks]
01 . 3) The student 28.;
counted the number of
cells she observed in
each stage of mitosis.
Of the 200 cells she
counted, only six were in
anaphase.
One cell cycle of onion
root tissue takes 16 hours.
Calculate how many
minutes these
cells spend in anaphase.
Show your working.
[2 marks]
https://quizlet.com/958652550/as-biology-74012-paper-2-specimen-2014aqa-as-biology-74012-paper-2-version-final-marking-scheme-2024-202… 2/17
, 10/17/24, 4:35 PM AS Biology (7401/2) Paper 2 Specimen 2014/AQA AS BIOLOGY 7401/2 Paper 2 Version Final Marking Scheme/ 2024-2025 …
02 . 2) A scientist 0.22;
investigated the uptake
of sodium ions by animal
tissue.
To do this, he:
• used two flasks, F and G
• put equal masses of
animal tissue into each
flask
• added equal volumes of
a solution containing
sodium ions to each flask
• added to flask F a
solution of a substance
that prevents the
formation of ATP by
cells
• measured the
concentration of sodium
ions remaining in the
solution in each
flask.
Figure 2 shows his results.
Calculate the rate of
uptake of sodium ions by
the tissue in flask G
during the first
20 minutes of this
investigation.
[1 mark]
02 . 2) The scientist 1. Uptake in flask G much greater than in flask F;
concluded that the cells 2. Showing use of ATP in flask G;
in flask G took up sodium 3. Sodium ion concentration in flask G falls to
ions by active zero;
transport. Explain how 4. Showing uptake against a concentration
the information given gradient;
supports this conclusion.
[4 marks]
https://quizlet.com/958652550/as-biology-74012-paper-2-specimen-2014aqa-as-biology-74012-paper-2-version-final-marking-scheme-2024-202… 3/17
