Download Cell Processes Overview

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Intro to Cell Processes
What do cells do to keep an organism alive?
 Cells take in nutrients and release waste
(Go to: http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/cells/osmosisact.shtml
and watch the animation to answer the following questions).
1. There are 2 mechanisms for moving stuff in and out of cells called
_______________ and _______________.
2. Diffusion: A drop of ink contains a high concentration of inkiness. When we drop
ink into water, inky particles spread out. They move from where there is a lot of ink
(________ _______________) to where there is less (a ________
_______________). They move from high to low concentration, so we say they
diffuse down a _______________ _______________. The greater the difference
between the high and low levels, the _______________ the spread.
3. Diffusion in the digestive system - When we eat food, it gets broken down into
smaller particles like amino acids (protein building blocks) and sugars. These
particles move from the _______________ where the concentration is high to the
_______________ where the concentration is low because of the process called
_______________.
4. Diffusion in the lungs – Explain in your own words how diffusion works between
your lungs and your blood vessels.
____________________________________________________________________
____________________________________________________________________
____________________________________________________________________
5. Cell membranes are “selectively permeable”. What does that mean?
____________________________________________________________________
6. Osmosis – In osmosis, cell membranes let through __________. If we put pure
water on one side the membrane and a chemical solution on the other, the water
will _______________ from high to __________ concentration of water.
Eventually, the concentrations on both sides of the membrane are the same and
there is an equal flow of water in both directions. This is called
_________________________.
7. Explain an osmosis example in your own words.
____________________________________________________________________
____________________________________________________________________
 Cells use energy to do work (Use Sciencesaurus page 79)
1. Photosynthesis: Producers (plants) trap light energy to make their own food
(sugar). They combine carbon dioxide, water and _______________ to make
_______________ and oxygen. The organelle this happens in is the
____________________.
2. Cellular Respiration: This is when all organisms (including plants) release energy
from food (sugar). They combine oxygen and __________________ to make
carbon dioxide, water and _______________. The organelle this happens in is the
____________________.
 Cells make materials the organisms needs (Use Sciencesaurus page 79)
1. Protein Synthesis: Ribosomes make _______________ out of amino acids. Living
things use proteins to ______________________________________ and to
_______________________________________________________. About half the
stuff in your body is made of protein!
 Cells make more cells (Use Sciencesaurus page 80)
1. Cell Division: This is when existing cells divide to form __________ cells. This
allows organisms to do two things:
- _________________________________________________________________
-
_________________________________________________________________