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Quiz 4 :

Life Is Cellular

Quiz 4 :

Life Is Cellular

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Examine the figure below.Assume each sugar molecule represents a percentage point of sugar dissolved in the solution.Over time,the solution level on the left side of the figure would ________,while the solution level on the right side of the figure would ________.This is because the solution on the left side of the figure is ________,while the solution on the right side of the figure is ________. img
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A

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If the concentration of sugar molecules in water on side "A" of a selectively permeable membrane is 5 percent,and the concentration of sugar molecules in water on side "B" of a selectively permeable membrane is 15 percent,the water will
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B

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The selective permeability of a phospholipid bilayer membrane can be increased with help from ________ proteins.
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D

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During the process of ________,water diffuses across a semipermeable membrane from an area where water is more concentrated to an area where water is less concentrated (it moves along the water concentration gradient).
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A screen door allows breezes to enter and aromas to exit but keeps out insects.Its function most resembles
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Some antibiotics used to treat bacterial infections kill the bacteria by chemically punching holes in the cell wall of the bacteria,by preventing the bacteria from replicating their DNA,or by many other actions that ultimately cause cell death.Why do these antibiotics not work to kill viruses and cure people of viral infections?
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Adenine (A),thymine (T),guanine (G),and cytosine (C)are the ________ building blocks for DNA; they are organized in different combinations to code for all of the proteins needed to accomplish everything the cell does.
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Cheryl is in a lab attempting to prepare a slide of cow blood for observation in a wet mount.She places a small drop of the blood on a slide,adds a drop of strong saline (salt)solution,and then covers all of it with a coverslip.After returning to her desk,she observes the slide with her microscope and notices that all of the red blood cells (RBCs)do not look like the nice round donut-shaped cells in her lab manual.Instead,the RBCs look very shriveled up.Her lab partner,Derek,has also made a slide,but the RBCs on his slide do look like the ones in the lab manual.Derek used a more dilute solution of saline but the same vial of blood. The most plausible explanation for the appearance of the blood cells on Cheryl's slide is that the
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Dialysis tubing is a selectively permeable membrane that can be filled with a solution to simulate a cell.A piece of dialysis tubing has been filled with a cloudy white solution of 5 percent starch,5 percent egg albumin (protein),and 5 percent glucose (a small sugar)dissolved in water to simulate a cell.This simulated cell is weighed and then placed in a beaker of water.After soaking in the water for one hour,the simulated cell is once again weighed. Over time,the weight of the simulated cell can be expected to
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Cells naturally,without using energy,respond to changes in water concentration through the process of
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Scientists repeat their experiments over and over again because they
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The plasma membrane of some white blood cells contain ________ proteins that bind with proteins of cells such as bacteria that have invaded the human body.
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Liposomes form spontaneously from ________ and are important because ________.
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Which of the following types of organisms are single-celled (unicellular)?
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Phospholipids are large organic molecules with a hydrophilic,polar phosphate head connected to hydrophobic,nonpolar fatty acid tails.These molecules arrange themselves to form a mostly impermeable barrier between a liposome and its environment by lining up
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Which of the following is a part of accepted cell theory?
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Which of the following accurately describes viruses?
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Living cells have an intact phospholipid bilayer that separates the cell from its external environment; this structure is commonly referred to as the
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An experiment mixed oil (lipids),organophosphate-containing detergent in water,and copper ions to act as a catalyst for a chemical reaction.Membranes budded off of the oil in this mixture.Which of the following is a reasonable and possible explanation of the experimental results?
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Which of the following statements best describes the differences between the nuclear envelope and the plasma membrane?
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