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cell processes
study of diffusion/osmosis/mitosis
35
Science
7th Grade
10/07/2009

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Cards

Term
what is diffusion
Definition
the passage of materials from an area of greater concentration to an area of less concentration.
Term

what is osmosis

 

Definition
the passage of water molecules from an area of greater to an area of less concentration
Term
diffusion
Definition
deals with solids and gases passing through a membrane.
Term
osmosis
Definition
deals only with the passage of water.
Term
passive transport
Definition
the movement of molecules through the cell membrane without using energy
Term
active transport
Definition
the movement of molecules through acell membrane using energy
Term
requirements for diffusion to occur
Definition

small molecules

semipermeable membrane

more molecules on one side of the membrane than the other

Term
what molecule was the small molecule in the lab on diffusion
Definition

iodine since it passed through the membrane

starch was large and did not pass

Term
in the lab on osmosis why did the carrot become soft when placed in salt water
Definition

because less water in salt water surrounding the carrot so the carrot lost the water since it had more molecules of water in it

(greater to less)

Term
dialysis membrane
Definition
a substance that takes the place of the semipermeable cell membrane
Term
plasmolysis
Definition
when the cell shrinks
Term
turgor
Definition
when a cell becomes rigid/hard
Term
mitosis
Definition
the division of a cell into 2 parts
Term
how many phases are there in mitosis
Definition

5

interphase

prophase

metaphase

anaphase

telophase

Term
what happens in interphase
Definition
resting stage when cell regroups
Term
prophase
Definition

chromosomes double

centrosomes double

nuclear membrane,nucleus,nucleolus disappear

spindle fibers appear

Term
metaphase
Definition
chromosomes line up in the center of the cell on the spindle fibers
Term
anaphase
Definition
the chromosomes leave the center and migrate to the opposite ends of the cell
Term
telophase
Definition

the chromosomes reach opposite ends

nucleus,nucleolus,nuclear membrane all reappear

the cellmembrane in a animal cell pinches in to form 2 daughter cells

in a plant cell a new cell wall forms

Term
what does each daughter cell contain
Definition
the same number of chromosomes as the mother cell and half the amount of cytoplasm
Term
how long does the process of mitosis take
Definition
45 minutes
Term
how long does it take for the daughter cells to regrow to a mother cell
Definition
72 hours
Term
how many chromosomes in a body cell
Definition
46
Term
how many chromosome in a sex cell
Definition
23
Term
cytokenesis
Definition
when the cell divides
Term
meiosis
Definition
in a sex cell there is a double division of the cell so there is half the number the mother cell has in chromosomes
Term
what is photosynthesis
Definition
it is the process by which a plant cell makes its own food
Term
what are the raw materials for the production of food
Definition
sunlight,water,carbon dioxide
Term
what are the products of photosynthesis
Definition
sugar and water and oxygen
Term
what is cellular respiration
Definition
the site where oxygen and food combine to make energy
Term
what is respiration
Definition
the act of breathing
Term
what is breathing
Definition
the inhalation of oxygen and the exhalation of carbon dioxide
Term
where does cellular respiration take place
Definition
mitochondria
Term
what are the structures in the plant cell which help with photosynthesis
Definition
chloroplasts/chlorophyll
Term
what is fermentation
Definition
the production of energy without using oxygen
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