In "Everydаy Use" by Alice Wаlker, Mаma gives the quilts tо Maggie because she
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.) Membrane phospholipids(b) form impermeable layers for cells.(c) remain fluid because they are tightly packed against one another.(d) have hydrophilic tails that face outward and are exposed to water and hydrophobic heads that face the center of the membrane and are shielded from water. Option (d) is incorrect because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. Based on the figure above, which of these experimental treatments would increase the rate of sucrose transport into a plant cell?(a) decreasing extracellular pH (b) decreasing cytoplasmic pH(c) decreasing extracellular sucrose concentration(d) adding a substance that makes the membrane more permeable to hydrogen ions Option (a) is correct 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 (b) 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 mass. 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 provided, which unknown solution has a molarity that most closely reflects the molarity of sweet potato cells? Unknown solution 4 is correct because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. Which structure is part of the endomembrane system?(a) Golgi apparatus (b) centrosome(c) mitochondrion Option (a) is correct 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 (a) is correct 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.) Membrane phospholipids(b) form impermeable layers for cells.(c) remain fluid because they are tightly packed against one another.(d) have hydrophilic tails that face outward and are exposed to water and hydrophobic heads that face the center of the membrane and are shielded from water. Option (b) is incorrect because:
Evаluаte the fоllоwing questiоn аnd answer choice, then select the *BEST* explanation below. Based on the figure above, which of these experimental treatments would increase the rate of sucrose transport into a plant cell?(a) decreasing extracellular pH (b) decreasing cytoplasmic pH(c) decreasing extracellular sucrose concentration(d) adding a substance that makes the membrane more permeable to hydrogen ions Option (b) is incorrect because: