science

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  • Created by: sammy
  • Created on: 13-05-13 14:02
what are the main features of an animal cell and their functions?
nucleus (contains DNA, controls the cell), cytoplasm (all chemical reactions happen here), cell membrane (controls what goes in and out), mitochondria (releases energy from sugar during aerobic respiration), ribosomes (where proteins are made).
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what is in a plant cell but not in a animal cell?
cell wall ( keep the cell strong), vacuole (filled with cell sap to support the cell),chloroplasts (contain chlorophyll which is used in the process of photosynthesis),
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are all bacterial cells bad for you and why?
no some are bad because they cause diseases, but some are good because they help us break down waste.
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what is considered a fungus?
mushrooms, moulds and yeast
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why were fungal cells discovered before bacterial cells?
because even though they are both single celled organisms fungal cells are much bigger than bacterial cells.
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what is a fungus cell wall made of?
chitin
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what is different about a bacterial cell and a fungal cell?
bacterial cells dont have a nucleus, instead they have a loop of DNA, fungal cells have a nucleus and no capsule.
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how is a red blood cell adapted?
red blood cells have no nucleus so they have a lot of space inside for hemoglobin which is a chemical that combines with oxygen so that it can be transported around the body efficiently. small, fit into narrow vessels; large surface area.
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how does a nerve cell transmit signals around the body?
it has many short extensions at the ends to send electrical impulses from one nerve to another. it has a long nerve fibre extension which is insulated in fatty sheath to prevent loss of the impulse and to make it travel quicker.
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how do muscles bring about movement?
the cell is long and thin and full of proteins to make it contract. the contractile proteins shorten the cell.
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what is in a sperm cell?
int he head of the cell is the nucleus and has a tail to help the sperm swim to the egg.
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how is ciliated epithelial tissue adapted?
it is tall column shaped cells that are tightly packed together. they hae fine hairs called cilia. the cilia beat together to create a current which helps move particles up and out of the wind pipe.
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what makes palisade mesophyll cells adapted for photosynthesis?
they are column shaped cells at the top of a leaf. these cells contain chloroplasts, which contains chlorophyll and this traps sunlight and is converted into energy to create photosynthesis.
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why do root hair cells not contain chloroplasts?
the root hair cell is onyl used for absorbing water and transporting it around the plant. the root cells are underground and no sunlight can be reached. sunlight is crucial for photosynthesis,it would be a waste for root cells to contain chloroplasts
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what is the xylem tube?
xylem tubes are both found in the roots, stem and leaves of a plant. Xylem is made of living cells, it is hollow so it allows to transport water around the plant. it is hard so it also supports the plant.
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hence, what is a phloem tube?
phloem tubes are dead cells with living cells next to it. tubes found in the stem roots and leaves. the end wall cells are perforated. it allows minerals and sugars to move throughout the plant. the living cells, supply energy to transport the sugars
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what is diffusion?
the movement of particles from a high concentration to a low concentration. this is called moving down the concentration gradient.
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what is an example of diffusion?
smoke moving from the toaster (an area of high concentration) to the rest of the house (to an area of low concentration).
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what increases the rate of diffusion?
high temperatures (particles have more energy), the shorter the distance the faster the diffusion, the greater the surface area the faster diffusion will be.
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Card 2

Front

what is in a plant cell but not in a animal cell?

Back

cell wall ( keep the cell strong), vacuole (filled with cell sap to support the cell),chloroplasts (contain chlorophyll which is used in the process of photosynthesis),

Card 3

Front

are all bacterial cells bad for you and why?

Back

Preview of the front of card 3

Card 4

Front

what is considered a fungus?

Back

Preview of the front of card 4

Card 5

Front

why were fungal cells discovered before bacterial cells?

Back

Preview of the front of card 5
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