In the Following Flowchart Summarizing Membrane Transport,both Active and Facilitated

question 87

Multiple Choice

In the following flowchart summarizing membrane transport,both active and facilitated transports terminate at separate carrier proteins.Which statement explains why the lines do not converge at the same carrier protein?

• A) The two processes move items across the membrane in opposite directions; the carriers are positioned on opposite sides of the membrane.
• B) During facilitated transport, hydrophobic molecules cross the membrane; hydrophilic molecules require active transport to cross the membrane.
• C) Energy is required to drive an active transport carrier protein, whereas a facilitated carrier operates down the concentration gradient and requires no energy input.
• D) Active transporters move only ions with net charge, whereas facilitated transporters move only polar or neutral molecules.

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Definitions:

Marginal Product

The additional output that can be produced by adding one more unit of a specific input, keeping all other inputs constant.

Production Possibilities

The different combinations of goods and services that an economy can produce given its available resources and technology.

Average Product

A metric that measures output per unit of a variable input, calculated by dividing total production by the quantity of the variable input.

Diminishing Marginal Returns

A principle stating that as additional units of a variable input are added to a fixed input, the additional output produced from each new unit decreases beyond a certain point.