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Flashcards in B1- Cells structureAnd Transport Deck (20)
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Define Diffusion

Diffusion is the movement of particles from an area of hight concentration to an area of low concentration , down a concentration gradient. Diffusion continues until an equilibrium is reached( when they are all spread out).


Name 3 factors that increase the rate of diffusion

- concentration gradient
- temperature
- surface area


Why does temperature increase the rate if diffusion?

The higher the temperature the more energy the particles have to vibrate, therefore the bump into each other more often and end up increasing the rate of diffusion


Why does a smaller surface area increase the rate of diffusion?

The smaller the surface area of area of the exchange the less room for the particles to move around in therefore they will bump into each other more often than in a large surface area.


What type of concentration gradient increases the rate of diffusion?

High concentration gradient


Whats are Prokaryotic cells?

Smaller and simpler cells like bacterial cells


What are eukaryotic cells?

Bigger and more complex cells that include all animal and plant cells


What is the expected size of Eukaryotic cells?

10 - 100 um (micro-metres)


What the equation for magnification?

Magnification = Image size/Real size


Define osmosis

The movement of water particles across a semi-permeable membrane from an area of high concentration to a lower concentration, down a concentration gradient


Define active transport

Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration. In active transport, particles move against the concentration gradient - and therefore require an input of energy from the cell.


Nucleus (plant, animal or bacteria cell?)

Contains genetic material that control the activities of the cell

Found in plant and animal cells( Bacteria have a strand of DNA instead)


Cytoplasm (plant, animal or bacteria cell?)

Gel-like substance where most of the chemical reactions happen. It contains enzymes that control these chemical reactions

Found in animal, plant and bacterial cells


Cell membrane (plant, animal or bacteria cell?)

Holds the cell together and controls what goes in and out

Found in animal, plant and bacterial cells


Mitochondria (plant, animal or bacteria cell?)

These is where most of the reactions for respiration takes place and respiration transfers energy that the cell needs to work

Found in animal and plant cells


Ribosomes (plant, animal or bacteria cell?)

They are where proteins are made in the cell

Found in plant cells


Cell wall (plant, animal or bacteria cell?)

It supports the cell and strengthens it , made out of cellulose

Found in plant and bacterial cells


Permanent vacuole (plant, animal or bacteria cell?)

Contains cell sap, a weak solution of sugar and salts

Found in plant cells


Chloroplast (plant, animal or bacteria cell?)

These is where photosynthesis occurs, which makes food for the plant. They contain a green substance called chlorophyll, which absorbs the light needed for photosynthesis

Found in plant cells


Plasmids (plant, animal or bacteria cell?)

Small rings of DNA

Found in bacterial cells