Cell Transport 9th grade Biology Quiz

Zainab Rizvi
Flashcards by , created about 5 years ago

Flashcards on Cell Transport 9th grade Biology Quiz, created by Zainab Rizvi on 10/28/2014.

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Zainab Rizvi
Created by Zainab Rizvi about 5 years ago
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Question Answer
dynamic equilibrium a system in a steady state since forward reaction and backward reaction occur at the same rate. the rate of loss is equal to the rate of gain.
facilitated diffusion uses transport proteins to move other ions and small molecules across the plasma membrane
osmosis the diffusion of water across a selectively permeable membrane.
solute the substance to be dissolved {sugar}
solvent the one doing the dissolving {water}
isotonic solution when a cell is in a solution that has the same concentration of water and solutes---ions, sugars, proteins, and other substances-----as its cytoplasm, the cell. iso- in Greek mean equal.
hypotonic solution If a cell is in a solution that has a lower concentration of solute; hypo- is a Greek word mending under
hypertonic solution the concentration of the solute outside of the cell is higher than inside; hyper- is a Greek word meaning above
active transport sometimes substances must move from a region of lower concentration to a region of higher concentration against the passive movement from higher to lower concentration. this movement of substances across the plasma membrane against a concentration gradient requires energy.
passive transport diffusion of water and facilitated diffusion of other substances require no additional input of energy because the particles are moving from an area of higher concentration to an area of lower concentration
endocytosis the process by which a cell surrounds a substance in the outside environment, enclosing the substance in a portion of the plasma membrane
exocytosis the secretion of materials at the plasma membrane (depositated)
phospholipid bilayer serves as the framework in which the other components of the membrane are embedded _________ 0 0 0 0 0 ii ii ii ii ii !! !! !! !! !! 0 0 0 0 0 _________
polar/non polar parts polar: also known as hydrophilic face outward where they interact with the water inside and outside of the cell. nonpolar: also known as hydrophobic face the interior bilayer, where they are shielded from water 0 0 0 0 polar ii ii ii ii nonpolar !! !! !! !! nonpolar 0 0 0 0 polar
channel proteins a protein that allows the transport of specific substances across a cell membrane
cholesterol it helps the outer coating of the cell
process of diffusion molecules tend to spread and they don't need energy
what is facilitated diffusion? what is the difference between diffusion and facilitated diffusion diffusion: through the phospholipid bilayer and happens to small or non polar particles facilitated diffusion: through the transport protein and happens to large or polar particles
concentration gradient a gradual change in the concentration of solutes in a solution as a function of distance through a solution. the gradual difference in the concentration of solutes in a solution between two regions. a gradient results from an unequal distribution of ions across the cell membrane. When this happens, solutes move along a concentration gradient. this movement is called diffusion.
phagocytosis and pinocytosis phagocytosis: is the situation when it gets a solid pinocytosis: the act of grabbing of liquid