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Which molecules may diffuse across a cell membrane without the expenditure of energy or the use of membrane proteins?
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Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?
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Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome
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When a cell is in a solution that has the same concentration of water and solutes as its cytoplasm, the cell is said to be in a(n) solution. a. isotonic b. hypotonic c. hypertonic b. facilitated
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Which molecules may diffuse across a cell membrane without the expenditure of energy or the use of m...
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