In Protists,both Gas Exchange and Excretion Occur by __________ Across

Question

In protists,both gas exchange and excretion occur by __________ across the plasma membrane.
A)endocytosis
B)active transport
C)diffusion
D)exocytosis
E)facilitated diffusion

Accepted Answer

Gas exchange and excretion in protists occur through diffusion across the plasma membrane. Larger molecules are transported through endocytosis, exocytosis, or facilitated diffusion, but gases and waste products such as CO2 and ammonia diffuse readily across the membrane. Active transport requires the use of energy to move molecules against their concentration gradient, which is not necessary for gases and waste products in protists.