You accidentally left a carton of milk on the counter all night. you notice that the milk tastes sour compared to the way it tastes when it is stored in the refrigerator overnight. 1. is this observation testable? 2. determine whether the observation is qualitative or quantitative. 3. write a hypothesis and null hypothesis. 4. what are the independent and dependent variables? 5. what are the controls (both positive and negative)?
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Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?
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You accidentally left a carton of milk on the counter all night. you notice that the milk tastes sou...
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