A-Level BiologyYear 2021Q6
18 6 Stem cells can be used to repair damaged organs. Stem cells from the heart can be used to produce mature heart cells. The diagram below shows one method used to produce mature heart cells. Stem cells from the heart Immature heart cells Mature heart cells Whole heart Chemicals isolated from the heart tissue (a) The whole heart contains cardiac muscle tissue. The whole heart is an organ. Give one difference between a tissue and an organ. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) Part of the eye contains stem cells. These cells can be used to repair damaged corneas in the eye. (i) Explain why stem cells from the heart cannot be used to grow cells to repair the cornea. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... Turn over 19 (ii) Explain why chemicals from the eye are needed to produce corneal cells from a suitable source of stem cells. (4) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (c) Human embryos are another source of stem cells used in medical therapies. Describe the decisions that society has to make about the use of these embryonic stem cells. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 6 = 11 marks)
Paper Source:8BN0_02_que_20211016.pdf
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Exam Specification Info
This question is part of the UK A-Level Biology syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
Syllabus levelAdvanced Level (A-Level)
SubjectBiology
Official MarksVariable (2–6 marks)
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