This question is about stem cells - AQA - GCSE Biology Combined Science - Question 6 - 2018 - Paper 1
Question 6
This question is about stem cells.
1. Give one place in a plant where stem cells are found.
2. What is one economic use of plant stem cells? Tick one box.
To c... show full transcript
Worked Solution & Example Answer:This question is about stem cells - AQA - GCSE Biology Combined Science - Question 6 - 2018 - Paper 1
Step 1
Give one place in a plant where stem cells are found.
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Answer
Stem cells are found in the meristematic tissue of plants.
Step 2
What is one economic use of plant stem cells?
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Answer
Ticked option: To produce large numbers of identical plants.
Step 3
Convert 6 picograms to grams.
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Answer
To convert 6 picograms to grams:
1 picogram = 10^{-12} grams,
thus:
6extpicograms=6imes10−12extgrams
Step 4
Calculate how many hours the cell spent in mitosis.
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Answer
Given the complete cell cycle is 15 hours and the cell spent 28% of this in mitosis, we calculate:
extTimeinmitosis=15imes0.28=4.2exthours
To 3 significant figures: 4.20 hours.
Step 5
Describe what happens in each of the three stages of the cell cycle.
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Stage 1 (Interphase):
The cell grows and increases the number of organelles. DNA replication occurs, resulting in two copies of each chromosome.
Stage 2 (Mitosis):
Chromosomes separate to each end of the cell, and the nucleus divides.
Stage 3 (Cytokinesis):
The cytoplasm divides, forming two genetically identical cells.
Step 6
Give two advantages of therapeutic cloning in medical treatments.
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May be used to cure or treat diseases, such as diabetes or paralysis.
Can produce replacement tissues or organs.
Step 7
Give two disadvantages of therapeutic cloning in medical treatments.
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Ethical concerns regarding the destruction of embryos.
Potential risk of contamination or infection from cultured cells.
