If the concentration of a solution outside a cell is less concentrated than inside the cell so that the cell gains water to its environment, the outside solution is said to be ____ to the cell contents.
A. hypertonic
B. in equilibrium
C. isotonic
D. hypotonic
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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
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.
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