These slides are part of the Integrating Biology & Inquiry Skills curriculum located at wp.geneseo.edu/ibis-curriculum

1. CLICKER QUESTION
While preparing a solution for a new experimental trial, Alex accidentally adds
0.09% NaCl instead of 0.9%! Unfortunately Sal placed the cells in the solution
without realizing the mistake. When viewed under a microscope Sal notices that
the cells have become swollen in appearance as opposed to their normally
flattened shape. You correctly predict that this is due to the addition of a ____
solution, which resulted in ____.
a) hypertonic; osmosis
b) hypotonic; osmosis
c) hypertonic; diffusion of salt
d) isotonic; active transport
e) hypotonic; active transport

2. CLICKER QUESTION
Cells growing in a solution with a _____ concentration of NaCl would be more
susceptible to temperature changes because they would now have a ______
surface area to volume ratio.
a) 0.9%; smaller
b) 0.9%; larger
c) 1.9%; larger
d) 1.9%; smaller
e) 0.09%; smaller

3. CLICKER QUESTION
Amoeba are single celled, free-living organisms, and a scientist is trying to
determine how the salinity of their aquatic environment might affect their ability
to thermoregulate. Amoeba are ectothermic and contain 0.9% NaCl. Amoeba
growing in a solution with a _____ concentration of NaCl would be more
susceptible to temperature changes because they would have a ______
surface area to volume ratio.
a) 0.9%; smaller
b) 0.3%; larger
c) 1.9%; larger
d) 1.9%; smaller

4. CLICKER QUESTION
When freshwater fish were placed in the saline lake, you would predict their
cells __
a) lost water by osmosis.
b) lost salt by osmosis.
c) gained water by active transport.
d) became impermeable to water.
e) increased in cell volume