4 Alcohol is broken down by liver cells - Edexcel - GCSE Biology - Question 4 - 2022 - Paper 1
Question 4
4 Alcohol is broken down by liver cells.
(a) Which process moves alcohol from the blood into the liver cells?
A diffusion
B respiration
C osmosis
D transpiration
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Worked Solution & Example Answer:4 Alcohol is broken down by liver cells - Edexcel - GCSE Biology - Question 4 - 2022 - Paper 1
Step 1
Which process moves alcohol from the blood into the liver cells?
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Answer
The correct answer is A diffusion. Diffusion is the process whereby molecules move from an area of higher concentration to an area of lower concentration.
Step 2
Calculate the difference in risk for these two people when each one drinks 28 units of alcohol per week.
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Answer
From Figure 7, Person A, who drinks alcohol on their own, has a risk level of approximately 4.5 for 28 units per week, while Person B, who drinks it with meals, has a risk level of about 2. This gives a difference of:
Difference in risk = Risk of Person A - Risk of Person B
Difference in risk = 4.5 - 2 = 2.5
Step 3
Using evidence from Figure 7, state two pieces of health advice for people about drinking alcohol.
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Answer
Drink alcohol in moderation to lower the risk of developing cirrhosis.
Consider drinking alcohol with meals, as it appears to reduce the risk of liver damage compared to drinking alone.
Step 4
State where genes are found in cells.
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Answer
Genes are found in the nucleus of cells, and they are located on chromosomes.
Step 5
Explain why the scientist is correct.
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Answer
Person B must have at least one F allele because she does not have cystic fibrosis. Additionally, person B must have inherited an f allele from person E, which is homozygous recessive (ff). This indicates that person B has the genotype Ff.
Step 6
State the genotype of person C.
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Answer
The genotype of person C is ff, indicating homozygous recessive for cystic fibrosis.
