When cells take in substances they need and get rid of waste products.
When two cells exchange a substance that the other needs in means to survive.
The spreading out of particles from high to low concentration.
Swaping your lunch with your mates.
8. What are ribosomes?
Where proteins are made in the cell
Where aerobic respiration occurs.
It controlls what goes in and out of the cell.
Conatins cell sap.
9. Bacteria's nucleus is...
Like any other cell's nucleus.
Not a true nuclues, it's just a single circular strand of DNA that floast freely in cytoplasm.
Doesn't exist.
10. Where does gas exchange occur?
The spine.
The brain.
The lungs.
The heart.
11. What do you need to observe something on a microscope?
Water drop mixed with iodine, cover slip, slide, specimen stained with iodine and a microscope.
Coverslip, specimen stained with iodine.
Water drop mixed with iodine, cover slip, slide, specimen stained with iodine.
Mincroscope and slide.
12. What are root hair cells specialised for?
Rapid signalling.
Absorbing water and minerals.
Transporting substances.
Contraction.
13. What does the structure of leaves allow?
It lets mitosis to happen.
Feet to diffuse in and out of cells.
Gases to diffuse in and out of cells.
I don't know.
14. What is the equation for image size?
Magnification*real size
Image size*real size
Magnification/real size
Real size/magnification
15. What is active transport?
Taking glucose out the gut.
It absorbs minerals in plants and takes in glucose in humans.
Geting a bus.
Keeping our bodies healthy.
16. What is the equation for magnification?
Image size/real size
Image size*real size
Real size/image size
Real size*imange size
17. What do a fish's gills have and why?
Absolutly nothing.
A large surface area for gas exchage.
A large volume for gas exchange.
Multicellular organisms.
18. What is osmosis?
The movement of water molecules across a partially permeable memebrane from a region of high water concentration to a region of low water concentration.
The movement of water molecules across a fully permeable memebrane from a region of low water concentration to a region of high water concentration.
The movement of water molecules across a partially permeable memebrane from a region of low water concentration to a region of high water concentration.
The movement of water molecules across a fully permeable memebrane from a region of high water concentration to a region of low water concentration.
19. What are sperm cells specialised for?
Reproduction.
Transporting substances.
Contraction.
Absorbing water and minerals.
20. What is the cell membrane?
Where aerobic respiration occurs.
It suports the cell and strengthens it.
It holds the cell together and controlls what goes in and out.
