chp 5 biology

Question 1

every cell is surrounded by what seperating it from its external enviroment

Answer 1

plasma membrane

Question 2

regulates passage of materials in and out the cell, helps maintain homeostasis

Answer 2

plasma membrane

Question 3

J. singer and G nicolson proposed what in 1972

Answer 3

fluid mosaic model

Question 4

embedded proteins loosley associate with the bilayer, like a dynamic mosaic

Answer 4

fluid mosaic model

Question 5

in the red blood cell what of phospholids are the parallel dark line

Answer 5

hydrophilic heads

Question 6

in the red blood cell what is the light zone between them

Answer 6

hydrophobic tails

Question 7

flexible, self sealing, and can fuse with other bilayers

Answer 7

lipid bilayers

Question 8

ampithatic proteins firmly bound to the membrane

Answer 8

integral membrane proteins

Question 9

intergal proteins that extend completley through the membrane

Answer 9

transmembrane protein

Question 10

located on the inner or outer surface of plasma membrane bound to exposed regions of the intergal proteins

Answer 10

periphal membrane proteins

Question 11

5 functions of a protein

Answer 11

anchor the cell to its substrate, transport molecules across the membrane, catalyze enzymatic reactions near the cell surface, receive information from other cells, serve as a identification tag

Question 12

form pores in the membrane

Answer 12

transport proteins

Question 13

two types of transport proteins

Answer 13

channel proteins, and carrier proteins

Question 14

transport water and specific type of ions

Answer 14

channel proteins

Question 15

changes shape

Answer 15

carrier proteins

Question 16

many ions and small molecules move through membranes by

Answer 16

diffusion

Question 17

the random motion of particles resulting in net movement down there own concentration gradient

Answer 17

diffusion

Question 18

diffusion is what type of transport

Answer 18

passive transport

Question 19

no net movement of water molecules occurs between cell and surrounding fluid

Answer 19

isotonic solution

Question 20

a higher concentration of solutes exist outside the cell, cell will shrink and lose water

Answer 20

hypertonic solution

Question 21

a lower concentration of solutes exist outside the cell, cell will gain water and swell

Answer 21

hypotonic solution

Question 22

occur when a plasma membrane seperates from the cell wall because it is in a hypertonic solution

Answer 22

plasmolysis

Question 23

a specific transport protein makes membrane permeable to a specific ion or polar molecule

Answer 23

facilitated diffusion

Question 24

a system across the cell membrane that pumps materials from a region of low concentration to high

Answer 24

active transport

Question 25

two types of endocytosis

Answer 25

phagocytosis, and pinocytosis

Question 26

ingesting large solid particles

Answer 26

phagocytosis

Question 27

taking in dissolved materials

Answer 27

pinocytosis

Question 28

larger molecules, particles of food and small cells are moved into or out of cells by

Answer 28

endocytosis and exocytosis

Question 29

vesicles export large molecules by the fusion of a vesicle with the plasma membrane

Answer 29

exocytosis

Question 30

the cells import materials by phagocytosis, pinocytosis, and receptor mediated endocytosis

Answer 30

endocytosis