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B2 1
Summary sheet
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Answers to summary questions
1 a) These cells must be produced on a regular basis to replace those that die
otherwise the organs listed would quickly break down.
b) Many nerve cells live for at least 70 years otherwise the human body could
not function for that length of time. But clearly some nerve cells die sooner
(progressively throughout life in fact) and this explains the decrease in
memory and other brain functions with age.
2 a) Stem cells are unspecialised cells that can differentiate (divide and change)
into many different types of cells when they are needed.
b) Adult stem cells and umbilical cord stem cells.
c) Embryonic stem cells.
d) Make new cells, tissues or organs for people who have diseases or
damage, e.g. new spinal nerves, treating Alzheimer's, etc.
e) Ethical issues, risk of side-effects such as cancer.
f) Frozen straight after birth.
Teaching notes
The questions are designed to crystallise knowledge and are not designed to be
exam style. This format is particularly useful for students who have difficulty
answering questions without some kind of writing frame.
AQA Science © Nelson Thornes Ltd 2006 B2 1 1

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B2 1.1
1 a) D Cell membrane
E Nucleus
F Cytoplasm (1 mark each)
b) i) Cell wall (1 mark)
ii) Cellulose (1 mark)
c) i) Vacuole (1 mark)
ii) Cell sap (1 mark)
d) Either Absorbs light energy
(1 mark)
to make/manufacture food/sugars (1 mark)
Or (Carries out) photosynthesis (2 marks)
The idea of light absorption and making food is needed for both marks.
Either point separately earns one mark. Photosynthesis embraces both
ideas and warrants both marks.…read more

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B2 1.1
3 a) Yes ­ because she would not know how much light there was shining on
the tree (1 mark)
OR Yes ­ so that she could calculate the efficiency of light gathering for
photosynthesis.…read more

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B2 1.1
1.…read more


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