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Question and answer
Q: When does the cell have to use active transport?
A: Some substances cannot pass through diffusion (when particles move from a high concentration to a low concentration), instead the particles are moved by use of energy. [ This is seen in root cells, where the roots absorb some of the mineral salts in the soil, they are absorbed by active transport since they are moved against a concentration gradient. ]
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Original conversation
User: When does the cell have to use active transport?

Weegy: Some substances cannot pass through diffusion (when particles move from a high concentration to a low concentration), instead the particles are moved by use of energy. [ This is seen in root cells, where the roots absorb some of the mineral salts in the soil, they are absorbed by active transport since they are moved against a concentration gradient. ]
ifm|Points 0|

User: Active transport performs which function in a cell? A. packages proteins for export from the cell B. distributes enzymes throughout the cytoplasm C. moves substances against a concentration gradient D. equalizes the concentration of water inside and outside the cell

Weegy: C. moves substances against a concentration gradient is the answer.
OxTornado007|Points 3828|

User: Molecules that are too large to be moved through the cell membrane can be transported into the cell by A. osmosis. B. diffusion. C. endocytosis. D. exocytosis

Weegy: C. endocytosis.
bikbak04|Points 942|

User: Which of these is a function of the cell membrane in all cells? A. producing cellular nutrients B. preserving cellular wastes C. neutralizing chemicals D. maintaining homeostasis

Weegy: B) is the correct answer.
cenlaguide|Points 0|

User: Which of these is a function of the cell membrane in all cells? A. producing cellular nutrients B. preserving cellular wastes C. neutralizing chemicals D. maintaining homeostasis

Weegy: B) is the correct answer.
cenlaguide|Points 0|

User: Which of these is a function of the cell membrane in all cells?

User: The proteins embedded in the phospholipid bilayer do what in the cell membrane? A. organize amino acids for protein synthesis B. help cells recognize each other C. allow larger molecules into the cell D. prevent the passage of certain molecules into the cell

Weegy: D. prevent the passage of certain molecules into the cell.
jolito098|Points 90|

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Asked 1/19/2012 8:16:37 AM
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