What are the main macromolecules found in the cell menbrane?
A. lipids and proteins
B. lipids and carbohydrates
C. lipids, carbohydrates, and proteins
D. lipids, carbohydrates, proteins, and nucleic acids
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The plasma membrane is the protective barrier that separates living organisms from their environment. What does the term selectively permeable mean?
Allowing some substances to pass more easily than others.
B. Allowing all substances to cross easily.
C. Not allowing substances to cross the membrane.
D. Allowing solids but not liquids to pass through easily.
Which process does the cell use to change the composition of the cell membrane?
A. osmosis
B. endocytosis
C. exocytosis
D. active transport
Endocytosis is the process of _____ and exocytosis is the process of _____.
A. bringing nutrients into the cell, removing excess water from the cell
B. bringing nutrient into the cell, shipping substance out of the cell
C. sending materials out of the cell, removing excess water from the cell
D. sending materials out of the cell, bringing nuterients into the cell.
If a plant cell had a ΨP = 0.3 bars and ΨS = -0.45 bars and was placed in an open beaker of water with a solution of 0.03 M NaCl at 25 degrees Celsius, which way will water move?
A. Water will move out of the cell because the cell has a greater water potential than the beaker.
B. Water will move into the cell because the cell has a lower water potential than the beaker.
C. The water potentials are equal, there will be no net movement.
D. Water will move out of the cell because the cell has a lower water potential than the beaker.
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