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biological membranes part 3 Flashcards

(14 cards)

1
Q

active transport

A

moves substances against a concentration and/or electrical gradient; requires energy; the energy source is often adenosine triphosphate; low concentration to high concentration

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2
Q

uniporter

A

moves one substance in one direction

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3
Q

symporter

A

move two substances in one direction

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4
Q

antiporter

A

moves two substances in opposite directions

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5
Q

primary active transport

A

requires direct hydrolysis of ATP

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6
Q

secondary active transport

A

energy comes from an ion concentration gradient that is established by primary active transport

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7
Q

sodium-potassium (Na+–K+) pump

A

an integral membrane glycoprotein (an antiporter)

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8
Q

macromolecules

A

proteins, polysaccharides, nucleic acids

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9
Q

endocytosis

A

brings molecules and cells into a eukaryotic cell

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10
Q

phagocytosis

A

cellular “eating” of large particles or cells; molecules or entire cells are engulfed

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11
Q

pinocytosis

A

cellular “drinking” of fluids and particles: a vesicle forms to bring small dissolved substances or fluids into a cell

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12
Q

receptor-mediated endocytosis

A

specific molecules

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13
Q

receptor proteins

A

integral membrane proteins located at specific sites on the cell membrane

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14
Q

exocytosis

A

materials packaged in vesicles are secreted from a cell when the vesicle membrane fuses with the cell membrane

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