Glucose Diffuses Slowly Through Artificial Phospholipid Bilayers

question 70

Multiple Choice

Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose-poor cytoplasm. Using this information, which transport mechanism is most probably functioning in the intestinal cells?

• A) simple diffusion
• B) phagocytosis
• C) active transport pumps
• D) exocytosis
• E) facilitated diffusion

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Definitions:

Zooplankton

Small, often microscopic animals found in aquatic ecosystems, serving as a crucial part of the food web by consuming phytoplankton.

Bathypelagic

A region of the ocean depths ranging from 1000 to 4000 meters, known for perpetual darkness and home to a variety of unique life forms.

Abyssal

Pertaining to the depths of the ocean, typically areas between 2,000 and 6,000 meters deep, characterized by cold temperatures and high pressure.

Mesopelagic

A layer of the ocean, also known as the twilight zone, that extends from 200 to 1000 meters below the surface, where only a small amount of light penetrates.