Question

Primary active transport is needed for moving substance Z into a cell. Which of the following...

Primary active transport is needed for moving substance Z into a cell. Which of the following statements is true?

A cell is placed into a 1 millimolar solution of substance Z and over time you witness the concentration of Z inside the cell increase to 5 millimolar.

A cell is placed into a 1 millimolar solution of substance Z and over time you witness the concentration of Z inside the cell increase to 1 millimolar.

A cell is placed into a 1 millimolar solution of substance Z and over time you witness the concentration of Z inside the cell decrease to 0.5 millimolar.

A cell placed into a 1 millimolar solution of substance Z and over time you witness the size of the cell shrink.

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Answer #1

Answer --- A cell is placed into a 1 millimolar solution of substance Z and over time you witness the concentration of Z inside the cell increase to 5 millimolar.

Primary active transport utilizes energy in form of ATP to transport molecules across a membrane against their concentration gradient.

Therefore, all groups of ATP-powered pumps contain one or more binding sites for ATP, which are always present on the cytosolic face of the membrane.

In Above example concentration of Z inside the cell increases to 5 millimole when Out side concentration is 1 millimole, which can be possible only by Active transport.

Passive transport is a movement of substances across cell membranes without need of energy.

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