Question

unit 1: instructional sequence④
how does the structure of cells allow for the different forms of life?
explain how molecules are transported across membranes & identify as passive or active
a. diffusion
b. facilitated diffusion
c. osmosis
d.active transport
e. endocytosis
f. exocytosis
identify the characteristics of a cell membrane.
hydrophilic \heads\
hydrophobic \tails\
show diffusion, facilitate diffusion and active transport
label the parts of the cell

Explanation:

Diffusion, facilitated diffusion, and osmosis are passive transport as they move molecules down the concentration gradient without energy. Active transport, endocytosis, and exocytosis are active as they require energy to move molecules against the concentration - gradient or in the case of endo/exocytosis, move large particles or fluids. The cell membrane has hydrophilic heads and hydrophobic tails which create a semi - permeable barrier.

Answer:

a. Passive
b. Passive
c. Passive
d. Active
e. Active
f. Active
Characteristics of cell membrane: Hydrophilic heads and hydrophobic tails form a semi - permeable structure.