ab 4 POB
Indicate all safety equipment that was worn at least at some point during this lab.
Both goggles and gloves will be required for much of the lab.
One option for the second experiment was to see if beets exposed to a mixture of cleaning products showed more cell damage than those exposed only to individual chemicals.
F. Mixing cleaning products is hazardous at best and can be lethal. It was not an option given for your second experiment.
Beet cores were best obtained by holding the beet in one hand above the lab table and inserting the corer with the other.
F. That method would be likely to result in an injury. Beet cores should have been obtained with the beet on a solid surface like the lab table.
Membranes form spontaneously in aqueous environments such as those in which cells live. The phospholipids orient themselves so that the hydrophobic tails point inward and the hydrophilic heads point outward.
Membranes form spontaneously in aqueous environments such as those in which cells live. The phospholipids orient themselves so that the hydrophobic tails point inward and the hydrophilic heads point outward.
How do membranes form?
Membranes form spontaneously in aqueous environments. Membranes form spontaneously in aqueous environments such as those in which cells live. The phospholipids orient themselves so that the hydrophobic tails point inward and the hydrophilic heads point outward.
Goggles will be worn during this lab whenever people are working with splashable liquids.
T
If 5 smaller pieces of beet were used instead of one larger piece, but the total mass was the same, you would expect any chemical solutions that damaged the beet cell membranes with one large piece to cause more cell membrane damage with 5 smaller pieces due to the increased surface area.
T. Increasing the surface area would mean that more individual cells could be damaged by the solution in the same time period. This would mean that more total pigment would be released.
Imagine that a beet cell membrane has embedded transport proteins that function best at a pH of 7. Given your Lab 4 results on the pH of "cola" what might you expect to happen if you soaked the cells in cola?
The embedded transport proteins might denature causing the cell membranes to leak.
Why was the light transmittance reading for the frozen beet cylinder so low? Check all that apply.
Water expands as it freezes, breaking the cell membrane. Water forms crystals as it freezes which poke holes in the cell membrane.
In the first experiment, heat will be applied to the samples using _____.
hot plates and/or water baths Beet cores will be placed in solution in test tubes. The test tubes will be placed in beakers on hot plates and water baths. Your instructor will go over the procedure and equipment, but you should have a good idea of the methods before class.
What name is given to the process by which water crosses a selectively permeable membrane?
osmosis Osmosis is the passive transport of water.
Which could be the independent variable in the beet cell membrane temperature experiment during lab 4?
temperature in degrees Celcius
If placed in tap water, an animal cell will undergo lysis, whereas a plant cell will not. What accounts for this difference?
the relative inelasticity and strength of the plant cell wall
The pH test strip above was dipped in an unknown substance. Based on the color key above and your testing in lab, what could the mystery substance be? (pic)
water
