biology paper 1- 2024
(Effect on breeding)
1. Less mating/breeding
OR
Fewer offspring;
(Explanation)
2. Fewer advertisement calls, so females not
attracted
3. Fewer mating calls as males less (sexually)
active. - questions and answersSuggest and explain the effect EE2 pollution in frog
habitats will have on
frog breeding.
[4 marks]
(Highly) folded cell(-surface) membrane; - questions and answersWhat are microvilli?
[1 mark]
(In prophase)
1. Chromosomes/chromatids (continue to) condense;
2. Chromosomes attach to spindle (fibres)
(In anaphase)
3. Centromeres divide/split;
4. Chromosomes/chromatids moved/pulled to
opposite poles/sides/ends; - questions and answersDescribe the appearance and
behaviour of chromosomes during prophase and during anaphase of mitosis.
[4 marks]
(Name of mutation)
1. (Single base) substitution;
2. Guanine to thymine
(Explanation)
3. (So) Arg (still) present
4. (So) no change in tertiary structure - questions and answersUse all the information in
this question to:
• name the type of mutation that occurred to produce the mutated gene
• give the change in DNA caused by this mutation
• explain the effect this mutation will have on the function of the enzyme.
[4 marks]
, 1. As diameter increases, risk of tears increases
and (risk of developing) aneurysms increase;
2. Few people have/at high risk of aneurysms;
3. Diameters above 4.5 (cm) at high risk (of tears) so may have aneurysms; - questions
and answersUsing all the information, what can you conclude about aorta diameter and
the risk of developing an aneurysm?
[3 marks]
1. Combine/mix/join with bile salts;
2. Make (more) soluble (in water);
3. Diffuses (into cells/ileum); - questions and answersVitamin A is a fat-soluble
substance.
Micelles are involved in the process of vitamin A absorption.
Describe the process of vitamin A absorption into cells lining the ileum.
[3 marks]
1. Diaphragm (muscle) contracts pulling diaphragm
down;
2. External intercostal muscles contract
pulling/moving ribs upwards/outwards;
3. (Causes) volume increase and pressure
decrease in thoracic cavity; - questions and answersDescribe how we breathe in.
[3 marks]
1. DNA in nucleus codes for enzyme/protein
(production);
2. Ribosomes produce enzyme/protein
3. Rough endoplasmic reticulum transports/modifies enzymes
4. Mitochondria produce ATP;
5. Golgi apparatus modify/process/
package/transport enzymes/protein
6. Vesicles move (protein) to cell(-surface) membrane - questions and answersDescribe
the role of organelles in the production and release of enzymes by
animal cells.
Do not include details of transcription in your answer.
[5 marks]
1. Elastic (tissue/layer) stretches and recoils
maintains/smooths blood pressure;
(Effect on breeding)
1. Less mating/breeding
OR
Fewer offspring;
(Explanation)
2. Fewer advertisement calls, so females not
attracted
3. Fewer mating calls as males less (sexually)
active. - questions and answersSuggest and explain the effect EE2 pollution in frog
habitats will have on
frog breeding.
[4 marks]
(Highly) folded cell(-surface) membrane; - questions and answersWhat are microvilli?
[1 mark]
(In prophase)
1. Chromosomes/chromatids (continue to) condense;
2. Chromosomes attach to spindle (fibres)
(In anaphase)
3. Centromeres divide/split;
4. Chromosomes/chromatids moved/pulled to
opposite poles/sides/ends; - questions and answersDescribe the appearance and
behaviour of chromosomes during prophase and during anaphase of mitosis.
[4 marks]
(Name of mutation)
1. (Single base) substitution;
2. Guanine to thymine
(Explanation)
3. (So) Arg (still) present
4. (So) no change in tertiary structure - questions and answersUse all the information in
this question to:
• name the type of mutation that occurred to produce the mutated gene
• give the change in DNA caused by this mutation
• explain the effect this mutation will have on the function of the enzyme.
[4 marks]
, 1. As diameter increases, risk of tears increases
and (risk of developing) aneurysms increase;
2. Few people have/at high risk of aneurysms;
3. Diameters above 4.5 (cm) at high risk (of tears) so may have aneurysms; - questions
and answersUsing all the information, what can you conclude about aorta diameter and
the risk of developing an aneurysm?
[3 marks]
1. Combine/mix/join with bile salts;
2. Make (more) soluble (in water);
3. Diffuses (into cells/ileum); - questions and answersVitamin A is a fat-soluble
substance.
Micelles are involved in the process of vitamin A absorption.
Describe the process of vitamin A absorption into cells lining the ileum.
[3 marks]
1. Diaphragm (muscle) contracts pulling diaphragm
down;
2. External intercostal muscles contract
pulling/moving ribs upwards/outwards;
3. (Causes) volume increase and pressure
decrease in thoracic cavity; - questions and answersDescribe how we breathe in.
[3 marks]
1. DNA in nucleus codes for enzyme/protein
(production);
2. Ribosomes produce enzyme/protein
3. Rough endoplasmic reticulum transports/modifies enzymes
4. Mitochondria produce ATP;
5. Golgi apparatus modify/process/
package/transport enzymes/protein
6. Vesicles move (protein) to cell(-surface) membrane - questions and answersDescribe
the role of organelles in the production and release of enzymes by
animal cells.
Do not include details of transcription in your answer.
[5 marks]
1. Elastic (tissue/layer) stretches and recoils
maintains/smooths blood pressure;
