Exam 3: Life Is Cellular

In your own words, briefly point out the primary difference between prokaryotes and eukaryotes, and then explain what might keep viruses from being included in either of these categories.

Match the following cellular structures with their primary function (you may need to use a function more than once). -chloroplast

Which of the following would be likely to move through a plasma membrane by simple diffusion?

Match the following cellular structures with their primary function (you may need to use a function more than once). -central vacuole

A long piece of ribbon wired along both long edges is twisted into a helix and wrapped around individual pipe cleaners that have been rolled into spools; this grouping is then twisted (super coiled) again to condense it. This could be best used as a simple model for

You buy a bunch of small, round, red radishes at the grocery store; they are on sale because they have been sitting in the produce aisle for a while. When you get home you remove the stems and clean them. With the first bite, you notice their texture is not as crisp and crunchy as you like. Your friend says you should refrigerate them in a bowl of water overnight. The next day the radishes are crisp and crunchy again. What is the most likely explanation of why they became crunchy again after soaking in water?

A factory with an office that controls the information sent to separate rooms for each of the manufacturing and shipping processes would be analogous to

Examine the figure below. If each sugar molecule represents a percentage point of sugar dissolved in the solution, what change would you expect to see in the solution level over time and why?

An animal cell that contains an extensive network of ________ is likely to be an important source of lipids and/or hormones important in the development and functioning of that animal.

Compare and contrast the nuclear envelope and the plasma membrane.

When scientists such as J. C. Venter and Daniel Gibson engineer a cell constructed with synthetic DNA in the laboratory, do they challenge accepted cell theory? If so, which part of cell theory do they challenge? Briefly explain your answer.

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 cell is weighed and then placed in a beaker of 3 percent iodine dissolved in water. When iodine and starch are mixed together, they form a bluish-black compound that is easily seen. After soaking in the yellow iodine-water solution for one hour, the cell is once again weighed. You also notice that the solution inside of the cell is now a dark blue color while the solution in the beaker is still a light yellow color from the iodine. What do you expect to happen to the weight of the cell over time and what can you deduce from the color change?