Transport System

Question 1

are composed of phospholipids and proteins

Answer 1

Membranes

Question 2

Membranes are commonly described as a ___

Answer 2

Fluid mosaic

Question 3

(glucose and other sugars) do not cross easily

Answer 3

Polar molecules

Question 4

(carbon dioxide and oxygen) cross easily

Answer 4

Nonpolar molecules

Question 5

► movement of substances across the membrane from higher to lower concentration without the expenditure of energy

Answer 5

Passive Transport

Question 6

Movement of large substances across the membrane by forming vesicles that fuse with the membrane

Answer 6

BULK TRANSPORT

Question 7

-is used to import substances useful to the livelihood of the cell

Answer 7

Endocytosis

Question 8

• “cell-eating” (engulfment) eg. WBC’s engulf bacteria, amoebas engulf microorganisms

Answer 8

Phagocytosis

Question 9

• “cell-drinking” eg. Kidney cells take up water to maintain fluid balance

Answer 9

Pinocytosis

Question 10

– requires the aid of a receptor
protein to take up substances
eg. intestinal cells take up large molecules from the inside of gut

Answer 10

Receptor-mediated endocytosis

Question 11

• is used to export bulky molecules, such as proteins or polysaccharides

Answer 11

Exocytosis

Question 12

is a form of endocytosis in which receptor proteins on the cell surface are used to capture a specific target molecule.

Answer 12

Receptor-mediated endocytosis

Question 13

is a process in which particles spread out evenly in an available space

Answer 13

Diffusion