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Jeopardy Diffusion Microscopy Cell Size Membranes Q $100 Q $100 Q $100
Final Jeopardy
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$100 Question: Diffusion What is Diffusion?
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$100 Answer: Diffusion The movement of molecules
from areas of higher concentration to areas of lower concentration.
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$200 Question: Diffusion Does diffusion require extra energy?
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$200 Answer: Diffusion No. It occurs with no added energy.
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$300 Question: Diffusion Why can you smell someone’s
perfume from across the room?
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$300 Answer: Diffusion Diffusion. The perfume molecules
move from an area of higher concentration to an area of lower concentration.
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$400 Question: Diffusion Why, if molecules will spread
naturally through diffusion, do you need to stir sugar into tea/coffee?
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$400 Answer: Diffusion Diffusion is a slow process.
Waiting for sugar to distribute itself would take a long time. (And you’d get cold coffee/tea!)
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$500 Question: Diffusion Heat is simply molecules moving
quickly. Would increasing temperature increase or decrease the rate of diffusion?
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$500 Answer: Diffusion Increasing temperature would
INCREASE the rate of diffusion. Molecules move faster when heated!
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$100 Question: Microscopy
What are the two main types of microscopes?
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$100 Answer: Microscopy Light and electron microscopes.
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$200 Question: Microscopy
List the three main types of electron microscopes and what each lets you observe.
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$200 Answer: Microscopy Scanning Electron Microscopes - Cell exteriors
Transmission Electron Microscopes - Cell interiors Scanning Tunnelling Electron Microscopes - The exterior of molecules.
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$300 Question: Microscopy
Compare and contrast images made by electron and light microscopes. Include at least 2 similiarities and 2 differences.
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$300 Answer: Microscopy Electron Microscope images:
Are always in black and white, though may be colorized; offer greater levels of magnification than light microscopes; show more detail than light microscopes Light Microscope images: can be in color; offer less magnification than electron microscopes and show less detail.
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$400 Question: Microscopy
The picture below was taken with either a light microscope or an electron microscope. Which microscope do you think was used to take this image? WHY?
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$400 Answer: Microscopy The picture was taken with light microscope.
You can tell because it is in color, shows the interior and exterior of the cell and shows many cells in less detail than found in an electron microscope picture. This picture is of onion epidermis, which we observed in class.
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$500 Question: Microscopy
One of the following pictures was taken with A TEM and one with an SEM. Which is which? Why?
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$500 Answer: Microscopy The picture on the left was taken
with a TEM. You can tell because it shows the interior of the cell, a red blood cell. Notice that an adult red blood cell lacks a nucleus. The picture on the right was taken with an SEM. You can tell because it shows the exterior of the cell, a red blood cell.
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$100 Question: Cell Size Are humans made of one large cell
or many small cells?
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$100 Answer: Cell Size Many small cells.
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$200 Question: Cell Size What is the formula for surface area?
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$200 Answer: Cell Size Length x Width x 6
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$300 Question: Cell Size Why are cells small?
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$300 Answer: Cell Size Diffusion is a slow process.
Diffusion into larger cells would take too long to transport materials in and out of the cell.
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$400 Question: Cell Size Calculate the surface area, volume,
and ratio of surface area to volume of a 2cm x 2cm x 2cm cell.
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$400 Answer: Cell Size 24 sq. cm; 8 cubic cm; 3 to 1.
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$500 Question: Cell Size Which cell would experience the higher rate of diffusion of material into the it: a chicken egg or an ostrich egg? Which would have the larger surface area to volume ratio? CHICKEN EGG OSTRICH EGG
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$500 Answer: Cell Size Diffusion would occur faster into
the chicken egg because of its smaller size. It would have the larger surface area to volume ratio.
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$100 Question: Membranes Define “selective permeability.”
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$100 Answer: Membranes Cells are choosy about what
enters into and exits from them.
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$200 Question: Membranes What does hydrophobic mean?
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$200 Answer: Membranes “Water-fearing”
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$300 Question: Membranes Draw a phospholipid. Which part is
attracted to water? Which part is repelled by water?
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O The phosphate head is attracted to water. The fatty
$300 Answer: Membranes O The phosphate head is attracted to water. The fatty acid tails are repelled by it.
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$400 Question: Membranes A colander (metal or plastic bowl
with a lot of holes in it used to drain pasta) will let water out but not food. Is this selective permeability? Why or why not?
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$400 Answer: Membranes Yes, this is selective permeability,
because the colander is choosing what passes through it.
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$500 Question: Membranes Are the fatty acid tails that are part of the lipid bilayer saturated or unsaturated? How does this affect membrane function?
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$500 Answer: Membranes Unsaturated. This makes the
membrane mostly liquid, which allows molecules to pass through it easily.
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Final Jeopardy A gelatin block is prepared with some
dyed solution added to it. The dye will be clear in the presence of acid, but turn pink near a base. The block is placed in a plastic bag. The block is placed above a container that contains ammonia. After 1/2 an hour, the block turns pink. Why does the gelatin undergo a color change?
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Final Jeopardy Answer Ammonia, a base, moved
through the plastic bag (a membrane) by diffusion. The membrane is selectively permeable because it let the ammonia in, but didn’t let the gelatin out.
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