Cells need to be buffered because A. they need to be able to increase or decrease their cytosolic pH to adapt to various environmental conditions. B. their proteins work best at low pH. C. they need to maintain a specific cytosolic pH to keep biomolecules from being ionized. D. they need to maintain a specific cytosolic pH to keep biomolecules at their optimal ionic state.
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- How does cholesterol affect membrane fluidity? Group of answer choices a. It tends to increase the fluidity b. It has no influence on membrane fluidity c. It tends to decrease membrane fluidityWhich One is NOT TRUE about membranes? a. Membranes rich in fatty acids containing one or more double bonds are more fluid than membranes with no double bonds in fatty acids. b. If cholesterol is present in membranes, the fluidity of membranes will be reduced at moderate and warm temperatures. c. If cholesterol is present in membranes, the fluidity will remain intact at low temperatures. d. If the fatty acids with double bond are present in membranes, the membrane will be viscous.At the physiological pH in the human body, amino acids are typically in the zwitterionic form. What is a zwitterion? A. A molecule that has parts that are charged but has an overall neutral charge. B. A molecule that has parts that are neutral but has an overall positive or negative charge. C. A molecule that has is charged at physiological pH. D. A molecule that has more than 1 charged ion.
- Which of the following is true of the molecule pictured below? A) It will spontaneously form into biological membranes. B) It would be liquid at room temperature because it contains unsaturated fatty acids. C) It would be solid at room temperature because it contains only saturated fatty acids. D) It would be liquid at room temperature because it contains only saturated fatty acids. E) It would be solid at room temperature because it contains unsaturated fatty acids.___ fatty acid chain length, as well as ___ the number of double bonds has the effect of increasing the fluidity of phospholipids that contain them. a) Increasing; decreasing b) Decreasing; decreasing c) Increasing; increasing d) Decreasing; increasingWhich of the following is true about the phosphorylation of proteins? A. Proteins are usually phosphorylated at amino acids that have hydroxyl group-containing side chains. B. Phosphorylation of proteins is catalyzed by phosphatases. C. Phosphoryation always activates enzymes. D. The specificity in phosphorylation is conferred solely by the amino acid to be phosphorylated.
- Membranes that contain a significant proportion of cis unsaturated fatty acids are more fluid than similar membraneswith higher levels of saturated fatty acids. Explain.As you change the pH from a low pH to a high pH what happens to the rate of an enzymatic reaction, in general terms? A The reaction rate will steadily increase as the pH increases. B The reaction rate will steadily decrease as the pH increases. C The reaction rate will start low, then increase, and then decrease again as the pH increases. D The reaction rate will not change as the pH increases.Which of the following is TRUE, if the protein pH is electrically neutral? Refer to the graph below. a. The denaturation of protein is lower than 100% b. The denaturation of protein is greater than 100% c. The protein is in native form d. The protein is completely denatured
- Positively charged molecules are often more easily endocytosed by cells than negatively charged molecules. Which of these BEST explains this observation? A. The hydrocarbon tails of membrane lipids are hydrophilic. B. The hydrocarbon tails of membrane lipids are hydrophobic. C. The phosphate group of membrane lipids are positively charged. D. The phosphate group of membrane lipids are negatively charged.A fish swims into cold water. How should it regulate so that the cell membrane continues to have the same fluidity as usual? (more than one answer may be correct) which are correct a.increase the length of lipids with short hydrocarbon tails b.increase the number of steroids in the cell membrane c.more saturated lipids in the membrane d.reduce the proportion of lipids with short hydrocarbon tails e.more unsaturated lipids in the cell membraneImagine that you place a drop of red food coloring in a glass of water.At first, the red molecules remain concentrated where you placedthe drop, but the color eventually spreads throughout the water.This example illustrates a. hydrolysis.b. decreasing entropy.c. osmosis.d. diffusion