Biology Paper 1 Hard Questions Exam
with Latest update
1) Describe what happens in each stage of the cell cycle.
(4) - CORRECT ANSWERS ✔✔Stage 1:
- DNA/CHROMOSOMES replicate
- cellular structures increase
Stage 2:
- ONE SET of chromosomes are pulled apart to opposite
poles of cell
Stage 3:
- cell membrane AND cytoplasm split
2) a. A survey monitors the risk of developing cirrhosis
amongst ppl who drink alcohol with & without meals.
Suggest one aspect if the survey which may reduce
validity. (1) - CORRECT ANSWERS ✔✔- ppl may
change drinking habits over time
- some may drunk all of their weekly alcohol at once
2) b. Age and gender were 2 factors that were controlled
in this analysis.
Many other factors were also controlled
, Biology Paper 1 Hard Questions Exam
with Latest update
Suggest 3 other factors which the scientists may have
controlled. (2) - CORRECT ANSWERS ✔✔- diet
- BMI
- smoking habits
- medication
- (medical conditions)
2) c. Give an example of a conclusion from the graph;
USE DATA. - CORRECT ANSWERS ✔✔- consuming less
that 50g with meals don't increase the risk
- even 25g a week increase the risk if not with meals
3) Cirrhosis of the liver leads to liver failure
Describe the effects of liver failure on the human body.
(4) - CORRECT ANSWERS ✔✔1) no bile made in liver
- lipids are not emulsified
- S.A of lipids not increased
- pH of small intestine won't be neutralised
- enzymes (in small intestine) will not work effectively or
= may lose weight
2) lactic acid not broken down
with Latest update
1) Describe what happens in each stage of the cell cycle.
(4) - CORRECT ANSWERS ✔✔Stage 1:
- DNA/CHROMOSOMES replicate
- cellular structures increase
Stage 2:
- ONE SET of chromosomes are pulled apart to opposite
poles of cell
Stage 3:
- cell membrane AND cytoplasm split
2) a. A survey monitors the risk of developing cirrhosis
amongst ppl who drink alcohol with & without meals.
Suggest one aspect if the survey which may reduce
validity. (1) - CORRECT ANSWERS ✔✔- ppl may
change drinking habits over time
- some may drunk all of their weekly alcohol at once
2) b. Age and gender were 2 factors that were controlled
in this analysis.
Many other factors were also controlled
, Biology Paper 1 Hard Questions Exam
with Latest update
Suggest 3 other factors which the scientists may have
controlled. (2) - CORRECT ANSWERS ✔✔- diet
- BMI
- smoking habits
- medication
- (medical conditions)
2) c. Give an example of a conclusion from the graph;
USE DATA. - CORRECT ANSWERS ✔✔- consuming less
that 50g with meals don't increase the risk
- even 25g a week increase the risk if not with meals
3) Cirrhosis of the liver leads to liver failure
Describe the effects of liver failure on the human body.
(4) - CORRECT ANSWERS ✔✔1) no bile made in liver
- lipids are not emulsified
- S.A of lipids not increased
- pH of small intestine won't be neutralised
- enzymes (in small intestine) will not work effectively or
= may lose weight
2) lactic acid not broken down
