Lacross the cell A. Two different ions or molecules in opposite directions B. Tw
ID: 3165633 • Letter: L
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Lacross the cell A. Two different ions or molecules in opposite directions B. Two different ions or molecules in the same directions C. Two of the same ions or molecules in the same direction D. One specific ion or molecule E. Two of the same ions or molecules in opposite directions 21. The oxygen atom of a water molecule A. Attracts electrons less strongly than the hydrogen atoms B. Is more positively charged than the hydrogen atoms C. Is more electronegative than the hydrogen atoms D. Is electrically neutral E. Is attracted to the negatively charged atoms of other molecules 22. Each of the following is a function of smooth endoplasmic reticulum except one. Identify the exception A. Removal and storage of calcium ions B. Modification of protein products C. Synthesis of steroid hormones D. Synthesis of triglycerides in liver cells E. Detoxification of drugs in liver cells 23. Two solutions are separated by a semipermeable membrane with the same properties as a cell membrane. Solution A is 5% glucose and solution B is 10% glucose. Under these circumstances, which of the following would most likely occur? A. Water will move from solution A to solution B B. Water will move from solution B to solution A C. Glucose will move from solution A to solution B D. Glucose will move from solution B to solution A E. At equilibrium the concentration of glucose will be higher in solution BExplanation / Answer
20. The correct answer is option B - two different ions or molecules in the same direction.
Explanation: Symporter are special class of membrane proteins which facilitate the transfer of two different molecules in the same direction. The best example is Sodium-dependent glucose cotransporters(or sodium-glucose linked transporter, SGLT). This transporter protein favors the movement of sodium and glucose in the same direction.
21. The correct answer is option D - is electrically neutral.
Explanation: The oxygen atom has 8 protons and 8 electrons. Because the water molecule has the same number of protons as electrons, a water molecule is neutral.
22. The correct answer is option B - Modification of protein products.
Explanation: Posttranslational modification of proteins take place in ribosomes. All other functions are taken care by smooth ER.
23. The correct answer is option B - Water will move from solution B to solution A.
Explanation: This question is based on osmosis. It is a phenomenon in which the solvent moves from a region of higher concentration to a region of lower concentration through a semipermiable membrane. In the give problem, the concentration of solution B is higher than solution A. So, the solvent water will move from A to B.
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