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Camponeschi - cells

Camponeschi - Cells target 3 & 4

QuestionAnswer
selectively permeable some substances can pass through while others cannot
What are the three methods substances can move in and out of a cell? diffusion, osmosis, and active transport
diffusion process by which molecules tend to move from an area of higher concentration to an area of lower concentration (HIGH TO LOW)
what causes diffusion because molecules are always moving and bumping into each other, when they are closer together, they bump into each other more, which spreads them out.
Give an example of something that enters the cell through diffusion oxygen enters cells through diffusion - when the concentration of oxygen is low in a cell, oxygen in water outside the cells diffuses in (from high concentration to low conentration)
osmosis diffusion of water through a selectively permeable membrane
How is osmosis related to diffusion? osmosis is an example of diffusion - it is diffusion of water across a membrane
when a cell is sitting in fresh water, where there is a higher concentration of water outside the cell, what will happen? (use the word osmosis in your answer) through the process of osmosis, water will diffuse into the cell (will diffuse from an area of high concentration - outside the cell, to an area of low concentration - inside the cell)
when a cell is sitting in salt water, where there is a higher concentration of water inside the cell, what will happen? (use the word osmosis in your answer) through the process of osmosis, water will diffuse out of the cell (will diffuse from an area of high concentration - inside the cell, to an area of low concentration - outside the cell)
does the cell purposefully control how much water enters and leaves no - unless it has a special structure to pump water in or out. water simply diffuses through the process of osmosis. the cell does not have control over this.
passive transport movement of materials through a cell membrane without using energy
Is the process of osmosis an example of active transport or passive transport? passive transport
Is the process of diffusion an example of active transport or passive transport? passive transport
active transport movement of materials through a cell membrane using energy - from low concentration to high concentration (opposite of passive transport)
which process - active or passive transport - requires energy? active transport
Which process, active or passive transport, moves molecules from an area of LOW concentration to HIGH concentration active transport
which process, active or passive transport, move molecules from an area of HIGH concentration to LOW concentration? passive transport
What are the differences between plant and animal cells? Plant cells have a cell wall and chloroplasts. Animals cells have neither.
Do both animal cells and plant cells have mitochondria? Yes! Mitochondria make usable energy for the cell from sugar. Animals eat this sugar from food. Plants make this sugar using photosynthesis!
What is a similarity between plant, animal, and bacterial cells? They all have a cell membrane, DNA, and ribosomes.
What is a difference between plant and animals cells compared to bacterial cells? Bacteria cells do not have a nucleus around their DNA - plant and animals cells do have a nucleus.
How are animal cells different than plant and bacterial cells? plant and bacterial cells have a cell wall and animals cells do not.
How does the size of a bacterium cell differ from a plant or animal cell? Bacteria are much smaller than plant and animal cells.
Created by: camponel on 2011-11-01



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