Ch. 5 Key Terms

Question 1

active transport

Answer 1

method of transporting material that requires energy

Question 2

amphiphalic

Answer 2

a molecule that has a polar and nonpolar part allowing it to interact with hydrophobic and hydrophilic things “dual-loving”

Question 3

aquaporin

Answer 3

channel protein that allows water through the membrane at a very high rate

Question 4

antiporter

Answer 4

transporter that carries two ions or small molecules in different directions

Question 5

carrier protein

Answer 5

membrane protein that moves a substance across the membrane by changing its shape

Question 6

caveolin

Answer 6

protein that coats the membrane on the cytoplasmic side, stabilizes the membrane during potocytosis

Question 7

channel protein

Answer 7

membrane protein that allows a substance to pass through its hollow core across the membrane

Question 8

clathrin

Answer 8

protein coating the cytoplasmic side of the membrane and stabilizes it for phagocytosis

Question 9

concentration gradient

Answer 9

area of high concentration to area of low concentration

Question 10

diffusion

Answer 10

passive transport method of light molecules according to concentration gradient

Question 11

electrochemical gradient

Answer 11

a combined electrical and chemical force that produces a gradient

Question 12

electrogenic pump

Answer 12

pump that creates a charge imbalancee

Question 13

endocytosis

Answer 13

type of active transport that moves substances, including fluids and particles into a cell

Question 14

exocytosis

Answer 14

process of passing bulk material out of a cell

Question 15

facilitated transport

Answer 15

process by which material moves down a concentration gradient (from high to low concentration) using integral membrane proteins

Question 16

fluid mosaic model

Answer 16

describes the plasma membrane’s structure as a mosaic of components using phospholipids, cholesterol, proteins, glycoproteins, and glycolipids, resulting in fluid character

Question 17

glycolipid

Answer 17

combination of carbohydrates and lipids

Question 18

glycoprotein

Answer 18

combination of carbohydrates and proteins

Question 19

hydrophilic

Answer 19

molecule with the ability to bond with water “water loving”

Question 20

hydrophobic

Answer 20

molecule that can’t bond with water, “water-hating”

Question 21

hypertonic

Answer 21

when extracellular fluid has a higher osmolarity than the fluid inside the cell, water moves out of the cell

Question 22

hypotonic

Answer 22

when extracellular fluid has a lower osmolarity than the fluid inside the cell, water moves inside the cell

Question 23

integral proteins

Answer 23

protein integrates into the membrane that interacts a lot with the membrane lipids’ hydrocarbon chains and often spans the membrane

Question 24

isotonic

Answer 24

when extracellular fluid has the same osmolarity as the outside of the cell, so no water movement occurs

Question 25

osmolarity

Answer 25

total amount of solutes dissolved in a specific amount of solution

Question 26

osmosis

Answer 26

transportation of water through a semipermeable membrane according to the waters concentration gradient across that membrane that results from the presence of solute that cannot pass through the membrane

Question 27

passive transport

Answer 27

method of transporting material through a membrane that does not require energy

Question 28

peripheral protein

Answer 28

protein at the plasma membranes surface either on its exterior or interior side

Question 29

pincocytosis

Answer 29

a variation of endocytosis that imports macromolecules that the cell needs from the extracellular fluid

Question 30

plasmolysis

Answer 30

detaching the cell membrane from the cell wall and constricting the cell membrane when a plant cell is in a hypertonic solution

Question 31

poctocytosis

Answer 31

variation of pinocytosis that uses a different coating protein (caveolin) on the plasma membranes cytoplasmic side

Question 32

primary active transport

Answer 32

active transport that moves ions or small molecules across a membrane (and may cause a different in charge across that membrane)

Question 33

pump

Answer 33

active transport mechanism that works against electrochemical gradients

Question 34

receptor-mediated endocytosis

Answer 34

variation of endocytosis that involves using specific binding proteins in the plasma membrane for specific molecules/particles, and clathrin-coated pits that become clathrin-coated vesicles

Question 35

secondary active transport

Answer 35

movement of material that results from primary active transport to the electrochemical gradient

Question 36

selectively permeable

Answer 36

membrane characteristic that allows some substances through

Question 37

solute

Answer 37

substance dissolved in a liquid to form a solution

Question 38

symporter

Answer 38

transporter that carries two different ions/small molecules, both in the same direction

Question 39

tonicity

Answer 39

amount of solute in a solution

Question 40

transport protein

Answer 40

membrane protein that facilitates a substance’s passage across a membrane by binding to it

Question 41

transporter

Answer 41

specific carrier protein or pumps that facilitate movement

Question 42

uniporter

Answer 42

transporter that carries one specific ion or molecule