ch. 5 bulk transport by endocytosis and exocytosis Flashcards

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1
Q

the substances cells required for growth are mostly large, polar molecules that cannot cross the hydrophobic barrier a lipid bilayer creates. two processes are involved in this bulk transport:

A

endocytosis and exocystosis

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2
Q

endocytosis and the three major types of endocytosis cells use:

A

-the plasma membrane envelops food particles and fluids
-like active transport, these processes also require energy expenditure.
1. phagocytosis
2. pinocytosis
3. receptor-mediated endocytosis

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3
Q

if the material the cell takes in is particulate (made up of discrete particles), the process is called

A

phagocytosis

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4
Q

If the material the cell tales in is liquid, the process is called

A

pinocytosis (pino=vino=wine=liquid)
-common among animal cells

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5
Q

molecules are often transported into eukaryotic cells through ______ - ________ _________. These molecules first bind to specific receptors in the plasma membrane.

A

receptor-mediated endocytosis

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6
Q

the portion of the receptor molecule that lies inside the membrane is trapped in an indented pit coted on the cytoplasmic side with the protein

A

clathrin

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7
Q

endocytosis in itself brings substances directly into the cytoplasm of a cell. true or false? and why?

A

false, the material taken in is still separated from the cytoplasm by the membrane of the vesicle.

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8
Q

the reverse of endocytosis is ______, the discharge of material from vesicles at the cell surface.

A

exocytosis
-in plant cells, exocytosis is an important means of exporting the materials needed to construct the cell wall through the plasma membrane.

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