大學(xué)生物課講義ppt模板之噬菌體chapter(編輯修改稿)
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【文章內(nèi)容簡(jiǎn)介】 water will diffuse in that direction –A hypertonic solution ? Has a higher concentration of solute. –A hypotonic solution ? Has a lower concentration of solute. –An isotonic solution ? Has an equal concentration of solute. Water Balance in Animal Cells – The survival of a cell depends on its ability to balance water uptake and loss. – Osmoregulation is the control of water balance in animals. Water Balance in Plant Cells – Water balance in plant cells is different. ? They have rigid cell walls. ? They are at the mercy of the environment. C. Active Transport: The Pumping of Molecules Across Membranes Active transport requires energy to move molecules across a membrane. – Carrier proteins are specific ? Combine with a molecule or ion to be transported across the membrane – Carrier proteins are required for: ? Facilitated Transport ? Active Transport Active Transport: ? Facilitated transport – Small molecules that are not lipidsoluble – Molecules follow the concentration gradient – Energy is NOT required Copyright 169。 The McGrawHill Companies, Inc. Permission required for reproduction or display. Inside plasma membrane carrier protein solute Outside ? Active
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