With Regard to Tight Junctions

question 21

Multiple Choice

With regard to tight junctions,

• A)one face of the cell, the apical surface, is in contact with other cells.
• B)they allow free movement of ions and molecules between cells.
• C)they are responsible for holding cardiac muscle together.
• D)they are composed of special proteins called connexins.
• E)they block the movement of basolateral integral membrane proteins to the apical surface.

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Definitions:

Nonionized

Referring to molecules that do not carry an electric charge due to loss or gain of electrons, affecting their solubility and reactivity.

Functional Group

A specific group of atoms within a molecule that is responsible for a characteristic chemical reaction of that molecule.

Chemical Properties

Characteristics of a substance that become evident during a chemical reaction, revealing the composition of the substance and how it reacts under certain conditions.

Organic Molecules

Compounds containing carbon atoms bonded to hydrogen atoms, often along with other elements, that are the basis of life on Earth.