Which Is True About Mediated Transport Across Cell Membranes

question 59

Multiple Choice

Which is true about mediated transport across cell membranes?

• A)It refers to the movement of ions through protein channels.
• B)It refers both to simple diffusion and to the active transport of molecules.
• C)It is characterized by saturable carriers and a maximum velocity of transport.
• D)As the concentration gradient across a membrane increases,the transport rate always increases.
• E)It is nonspecific;any transporter can transport any molecule across the cell membrane.

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Definitions:

Voluntary Movement

Voluntary movement refers to consciously controlled motor actions, involving coordination between the brain, nerves, and muscles.

Decision Making

The cognitive process of selecting a course of action among several alternatives.

Neocortex

The part of the brain involved in higher-order brain functions such as sensory perception, cognition, and the generation of motor commands.

Limbic Cortex

A group of brain structures involved in emotion, behavior, motivation, long-term memory, and olfaction.