Which Water-Soluble Vitamin Must First Be Bound to the Intrinsic

question 68

Multiple Choice

Which water-soluble vitamin must first be bound to the intrinsic factor secreted by the gastric mucosa before it can be absorbed by the intestinal epithelium?

• A) vitamin B₂ (riboflavin)
• B) vitamin C (ascorbic acid)
• C) vitamin B₁₂ (cobalamin)
• D) vitamin B₅ (pantothenic acid)
• E) vitamin B₆ (pyridoxine)

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Definitions:

Nonexplosive

Characterizing volcanic eruptions or events that release magma, gas, and ash in a relatively gentle and steady manner.

Thin Lava Flows

Layers of lava that spread out over large areas and cool to form relatively thin sheets of rock.

Lava Fountain

A volcanic phenomenon in which molten lava is forcefully ejected into the air from a vent or crack in the Earth's surface.

Pyroclastic Flow

A rapid flow of hot gases and volcanic debris that descends along a volcano's slopes when there's a violent eruption.