Question

Fill in the following chart with the characteristics typical of 5 points Facilitated Diffusion * high to small e either hydrophilic hydrophobic low Molecule Size (small/large/either) hydrophilic/hydrophobic/either high to low concentration on low to high concentration transport protein (yes/no) L energy required (yes/no)

Answer 1

First Question:

Facilitated diffusion is a type of passive transport where molecules move from high to low concentration with the aid of transport proteins such as carrier protein & channel protein. As this is passive transport, no external energy is require & molecules move down their concentration gradient. Hydrophobic & small polar uncharged molecules can easily diffuse through the phospholipid bilayers. However large hydrophilic & charged ions (Both small & large) can't move across the phospholipid bilayers by simple diffusion; they require facilitated diffusion & move with the help of carrier & channel proteins. The answer is summarized in the following table.

Facilitated Diffusion
Characteristics	Description
Molecule size (small/ large/ either)	Either
Type of molecule	Hydrophilic
Concentration gradient	High to low
Transport protein require?	Yes
Energy require?	No

Second Question:

Prokaryotic cells are relatively small in size & simpler in nature. They lack membrane bound organelles which can be found in eukaryotes. They also lack proper nucleus. But like eukaryotes they also have cell membrane. The answer is summarized in the following table.

(1-10μ m)

Prokaryotic cells
Characteristics	Description
Cell size	Small
Cell membrane	Yes
Membrane bound organelles	No
Nucleus	No