Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. An artificial "cell" consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the "environment," as shown below. The membrane is permeable to water and to the simple sugars glucose and fructose but impermeable to the disaccharide sucrose. Identify the correct net movement of solutes into and/or out of the cell (labeled with solid arrows) and the net osmosis (labeled with dashed arrows).(c) Option (c) is incorrect because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. Disruption of nuclear pore complexes in a eukaryotic cell will most likely interfere with the transport of which of the following molecules into the nucleus?(a) ribosomal proteins(b) rRNAs(c) mRNAs(d) phospholipids Option (d) is incorrect because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. Three lab groups carried out an experiment to identify the concentration of sucrose in six solutions. Each unknown solution (1-6) contained one of the following sucrose concentrations: 0.0 M, 0.2 M, 0.4 M, 0.6 M, 0.8 M, and -1.0 M. Cubes of sweet potato (1 cm3) were soaked for 24 hours in each solution and weighed to determine the change in weight. Each data entry represents the average of three sample replicates expressed as percent change in weight following a 24-hour soak in the unknown solutions. Unknown Percent Change in Weight Percent Change in Weight Percent Change in Weight Group 1 Group 2 Group 3 1 6.6 7.8 7.5 2 3.1 3.7 2.9 3 -2.7 -3.5 -2.5 4 0.7 0.5 1.1 5 -11.6 -12.3 -12.6 6 -5.2 -6.2 -4.9 From the data given, which statement below most accurately describes something that has occurred in response to a particular unknown solution?(a) Osmosis of water molecules from unknown solution 2 likely caused the increase in weight observed.(b) Unknown solution 3 represents a sucrose concentration slightly lower than the molarity of sweet potato cells; thus water is transported out of the cells.(c) Unknown solution 5 contains the highest concentration of sucrose, and the change in weight is due to the active transport of sucrose out of the cell.(d) Passive transport of sucrose out of the potato cells explains the change in weight observed for unknown solution 6. Option (d) is incorrect because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. (The correct answer has been omitted to focus on critical thinking skills.) Which one of the following statements about the endomembrane system is correct?(b) The endoplasmic reticulum is continuous with the plasma membrane.(c) Mitochondria function in the modification and sorting of lipids and proteins.(d) Most of the phospholipids of the endomembrane system are synthesized in the mitochondria.(e) Ribosomes move lipids and proteins among the different organelles of the endomembrane system. Options (d) is incorrect because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. (The correct answer has been omitted to focus on critical thinking skills.) Which one of the following statements about the endomembrane system is correct?(b) The endoplasmic reticulum is continuous with the plasma membrane.(c) Mitochondria function in the modification and sorting of lipids and proteins.(d) Most of the phospholipids of the endomembrane system are synthesized in the mitochondria.(e) Ribosomes move lipids and proteins among the different organelles of the endomembrane system. Options (e) is incorrect because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. Disruption of nuclear pore complexes in a eukaryotic cell will most likely interfere with the transport of which of the following molecules into the nucleus?(a) ribosomal proteins(b) rRNAs(c) mRNAs(d) phospholipids Option (b) is incorrect because: