B1 Biology Flashcards
What are the 3 ways substances can move in and out of cells
Diffusion
Osmosis
Active transport
What is diffusion
Movement of ANY particle from HIGH to LOW concentration
What can speed up the rate of diffusion and WHY?
Temperature because the particles move faster
What is osmosis
The movement of WATER
From area of HIGH water concentration to LOW
Across a CELL MEMBRANE
What is active transport
Movement of ANY particle from LOW to high (the opposite way)
What do plant cells have that animal cells do not
Cell Wall / Chloroplast / Vacuole
What is the function of:
Nucleus -
Controls cell / DNA
What is the function of
Mitochondria
Release Energy / Respiration
What is the function of
Ribosomes
Make Protein
What is the function of
Chloroplasts
Contain Chlorophyll /Photosynthesis /
Traps the sunlight
What is the function of
Cell Wall
Supports the cell / Made from Cellulose
What is the function of
Cell membrane
Control what enters and leaves the cell
What is the function of
Vacuole
Store of water / Cell Sap
Give an example of a EUKARYOTIC
cell
Animal / Plant cell
Give an example of a
PROKARYOTIC cell
Bacteria Cell
What is missing in a prokaryotic cell?
A nucleus (they have spaghetti like DNA) or rings of DNA called plasmids
What is a plasmid?
A ring of DNA found in a bacteria
A bacterial cell is 0.003mm long. A magnified image of the cell is 18mm long.
What is the magnification
18÷0.003
How do we work out mass change
End mass - starting mass
How do we work out % mass change?
Mass change ÷ starting mass x 100
Why is to mass change better than just mass change?
Because it does not matter what the starting size of the potato is
What has happened if the plant cells (e.g. potato) get heavier?
Water has moved in by osmosis
Osmosis required practical
Equipment -
Dependent V -
Control V -
Equipment- Test tube/Balances/Salt Solution
Dependent V- Mass of potato because it does not change
Control V-Type of potato/temperature
