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Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?
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Which of these is one of the nitrogenous bases in dna? a. proline b. leucine c. glycine d. thymine
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Hydrogen has only one electron in its only (and outer) electron shell. if a hydrogen atom were to absorb a small amount of energy, where would bohr say the electron would go? a. fly off the atom b. nowhere, it would just speed up. c. spiral inwards towards the nucleus d. move up to another shell that would form
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Three distinct layers are present in the gastrula stage the endoderm the mesoderm the ectoderm these...
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