ch. 5 bulk transport by endocytosis and exocytosis

Question 1

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:

Answer 1

endocytosis and exocystosis

Question 2

endocytosis and the three major types of endocytosis cells use:

Answer 2

-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

Question 3

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

Answer 3

phagocytosis

Question 4

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

Answer 4

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

Question 5

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

Answer 5

receptor-mediated endocytosis

Question 6

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

Answer 6

clathrin

Question 7

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

Answer 7

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

Question 8

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

Answer 8

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