Instructions

A living cell extracts energy from organic “fuel” molecules in small, enzyme-catalyzed steps. This allows the process of energy extraction to be regulated. but less free energy is released from the molecules than would be released by burning them O and all of the energy is released as heat that can be used to do work in the cell O and some of the energy is stored in bonds of activated carriers O and more free energy is released from the molecules than would be released by burning them QUESTION 29 Assuming that large numbers of open or ungated potassium (K) channels are present in the plasma membrane of a cell, it will be at its electrochemical equilibrium when o the membrane potential is zero (0) Othere is no more k left in the cytosol of the cell O the rate of K movement across the membrane is equal in both directions O the concentrations of inside and outside the cell are identical QUESTION 30 Match each description of a function with the component of the chloroplast photosynthetic system that is responsible for it. D. Accepts electrons from water A. Photosystem Il reaction center c. Final electron acceptor in linear photophosphorylation B. Photosystem I reaction center A Pumps Ht into the thylakold space (lumen) D. Cytochrome bef complex B. Accepts electrons from another photosystem NADP QUESTION 31 During receptor-mediated endocytosis, most receptors remain bound to their ligands and are targeted to lysosomes for degradation are separated from their ligands in endosomes and returned to the membrane domain they came from o remain bound to their ligands and are sent to the trans-Golg separate from their ligands in endosomes and are sent to a different domain of the plasma membrane

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