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AQA GCSE 1 GCSE PAPER 1 -2024- FINAL EXAM ACTUAL
QUESTIONS AND CORRECT ANSWERS ALREADY GRADED
A+ GUARANTEED SUCCESS
What is a tissue?
a group of cells that have similar structure and that function together as a unit
Types of tissues in plant that contain stem cells?
meristematic tissues
Which plant does aspirin originate from?
willow tree
Microscopes?
Light microscope: cheap, can see cell outline
Electron microscope: finer details including organelles due to greater resolving power and higher
definition
Embryo Clones?
Make clone of an embryo of a person, extract stem cells
Done so they won't be rejected
Diffusion?
Movement of particles down the concentration gradient
Passive- no energy
Increase: difference in concentrations, surface area, temperature
Osmosis?
Diffusion of water through a semi-permeable membrane to balance concentration of solutions
Must be water to move because larger particles can't fit through
Active transport?
Movement of particles through a membrane via carrier proteins
Requires energy, can go against concentration gradient
Osmosis practical?
, 2
Weigh identical vegetable pieces and place in varying concentrations of sugar solutions
After set time, remove from solution, dry to remove excess liquid, reweigh
Calculate change in mass
Plot graph
At 0% change in mass, the concentrations were equal
Organisation of human systems
Cell, tissue, organ, organ system
DS: Mouth
Teeth break down food mechanically
Saliva contains amylase
DS: Stomach
Churns food together with hydrochloric acid and enzymes
DS: Liver
Produces blue- stored in gall bladder before going to small intestine
Bile emulsifies lipids into small droplets, increasing surface area for better digestion
DS: Pancreas
Secretes amylase which breaks down starch into glucose in the small intestine
DS: Small intestine
Nutrients absorbed by villi
However starch is too large
DS: Large intestine
Water absorbed
Enzymes
Special proteins that act as biological catalysts, breaking down molecules into shorter ones
(polymers to monomers)
Specific- only breaking down molecules that fit its active site (lock and key model)
Enzyme Denaturation
Temperature increases enzyme activity until denature (when the active site changes shape)
Same is true for pH
, 3
Optimum= the condition for maximum activity
Digestive enzymes
Carbohydrases break down carbohydrates into simple sugars
Proteases break down proteins into amino acids
Lipases break down lipids into glycerol and fatty acids
Enzyme practical
Mix amylase and starch, start timer
Every ten seconds, add drop to iodine-filled spotting tray
Record time taken for no starch to be detected, shown by no colour change in the iodine
Repeat at different temperatures or pHs
Food tests
Starch- iodine turns black
Sugar- Benedict's solution goes from blue to brick red
Protein- Biuret's reagent goes from blue to purple
Lipids: cold ethanol goes cloudy or Sudan III splits into 2 layers, with the top being brick red
Lung components
Trachea: wind pipe
Bronchi: split off pipes
Bronchioles: branches
Alveoli: air sacs
Alveoli
Large surface area for gas exchange
Many capillaries for increased diffusion
Oxygen diffuses into blood stream and CO2 and water also diffuse out
Circulatory system type
Double circulatory system: blood enters heart twice every time it is pumped around the body
Right side of heart
deoxygenated blood
AQA GCSE 1 GCSE PAPER 1 -2024- FINAL EXAM ACTUAL
QUESTIONS AND CORRECT ANSWERS ALREADY GRADED
A+ GUARANTEED SUCCESS
What is a tissue?
a group of cells that have similar structure and that function together as a unit
Types of tissues in plant that contain stem cells?
meristematic tissues
Which plant does aspirin originate from?
willow tree
Microscopes?
Light microscope: cheap, can see cell outline
Electron microscope: finer details including organelles due to greater resolving power and higher
definition
Embryo Clones?
Make clone of an embryo of a person, extract stem cells
Done so they won't be rejected
Diffusion?
Movement of particles down the concentration gradient
Passive- no energy
Increase: difference in concentrations, surface area, temperature
Osmosis?
Diffusion of water through a semi-permeable membrane to balance concentration of solutions
Must be water to move because larger particles can't fit through
Active transport?
Movement of particles through a membrane via carrier proteins
Requires energy, can go against concentration gradient
Osmosis practical?
, 2
Weigh identical vegetable pieces and place in varying concentrations of sugar solutions
After set time, remove from solution, dry to remove excess liquid, reweigh
Calculate change in mass
Plot graph
At 0% change in mass, the concentrations were equal
Organisation of human systems
Cell, tissue, organ, organ system
DS: Mouth
Teeth break down food mechanically
Saliva contains amylase
DS: Stomach
Churns food together with hydrochloric acid and enzymes
DS: Liver
Produces blue- stored in gall bladder before going to small intestine
Bile emulsifies lipids into small droplets, increasing surface area for better digestion
DS: Pancreas
Secretes amylase which breaks down starch into glucose in the small intestine
DS: Small intestine
Nutrients absorbed by villi
However starch is too large
DS: Large intestine
Water absorbed
Enzymes
Special proteins that act as biological catalysts, breaking down molecules into shorter ones
(polymers to monomers)
Specific- only breaking down molecules that fit its active site (lock and key model)
Enzyme Denaturation
Temperature increases enzyme activity until denature (when the active site changes shape)
Same is true for pH
, 3
Optimum= the condition for maximum activity
Digestive enzymes
Carbohydrases break down carbohydrates into simple sugars
Proteases break down proteins into amino acids
Lipases break down lipids into glycerol and fatty acids
Enzyme practical
Mix amylase and starch, start timer
Every ten seconds, add drop to iodine-filled spotting tray
Record time taken for no starch to be detected, shown by no colour change in the iodine
Repeat at different temperatures or pHs
Food tests
Starch- iodine turns black
Sugar- Benedict's solution goes from blue to brick red
Protein- Biuret's reagent goes from blue to purple
Lipids: cold ethanol goes cloudy or Sudan III splits into 2 layers, with the top being brick red
Lung components
Trachea: wind pipe
Bronchi: split off pipes
Bronchioles: branches
Alveoli: air sacs
Alveoli
Large surface area for gas exchange
Many capillaries for increased diffusion
Oxygen diffuses into blood stream and CO2 and water also diffuse out
Circulatory system type
Double circulatory system: blood enters heart twice every time it is pumped around the body
Right side of heart
deoxygenated blood
