transport of negative ions? e fatty acid tails g. H ow do transmembrane proteins
ID: 269751 • Letter: T
Question
transport of negative ions? e fatty acid tails g. H ow do transmembrane proteins typically facilitate the selective, passie L by nahydrophilie channel that isolates the ions from the hydrophobic B. by pumping the ions using ATP to neu D. through osmosis E. None of the other answers es for substances than o. What is a fundamental reason that membranes in brain cells show different membranes in cells in the small intestine? A. the membrane cholesterol content varies B. the membrane carbohydrates differ between the two tissues C the membrane proteins differ between the two tissues D. the phospholipids E. the phospholipids contain more unsaturated fatty acid tails in intestinal cell membranes contain more unsaturated fatty acid tails in brain cell membranes its concentration gradient . Facilitated diffusionand moves a substance A. requires a protein I down B.isactive //up C does not require energyup D. requires energy / down E. does not require energy up ta. When the hydrogen ion (H+Jconcentration in a solution decreases, the pH will A. increase B. decrease C. not enough information to answer the question D. remain constant E. decrease slightdly The quesdions below refer to the following figure describing the reaction +BC+D C+D Progress of the Reacion 13. The above reaction A. could be coupled to the reaction: ATP->ADP+Pi B. could be coupled to an endergonic reaction C. could be coupled to an exergonic reaction D. would be used to power simple diffusion E. could describe the light-independent (dark) reactions of photosynthesis 14. According to the 2 law of thermodynamics, the amount of energy released by the above reaction that can directly power ADP + Pi>ATP is ?.? ?.d C, e D, slightly less than d E.slightly less than eExplanation / Answer
9.Answer is E. Ion channels are selective and passage through them is a rapid process. There are narrow pores in the channel which restrict of ions. Therefore, specific channel proteins are available which will help in passage of both positive as well as negative ions. Certain ion channels need stimulus like binding of any signalling molecule, or in certain cases changes in electric potential across the plasma membrane.
10.Answer is C. The tight junctions present in plasma membrane regulate permeability of the cells. These tight junctions especially in intestinal cells are complex proteins that comprise of transmembrane proteins. The intestinal barrier function is changed often by bacteria’s intracellular pathway adoption to change expression and distribution of tight junctions.
11. Answer is A. Facilitated diffusion is a process where molecules or ions are spontaneously moved across a biological membrane along their concentration gradient, guided by an integral membrane protein or pore channel. In other word, molecules move down their concentration gradient exhibiting their diffusive nature.
12.Answer is A. When H+ concentration in a solution decreases, the solution becomes basic. This means the pH will increase. A base generally decreases the solution’s pH.
13.Answer is C, where b shows activation energy of catalyzed reaction and d shows free energy of uncatalyzed reaction.
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