Chapter 16 mentioned that less than 3 percent of the water on Earth is freshwater. There are
organisms that have adjusted to the salinity of the oceans, but humans are not among them.
Therefore, scientists are working on various desalination procedures—methods of removing
the salt from ocean water. These desalination procedures are quite expensive and require
advanced technology. Aside from the cost, what do you see as other potential drawbacks of
performing desalination on a large scale?
What will be an ideal response?
A complicated procedure, such as desalination, would have a high energy demand. This could result in
the generation of more greenhouse gases that would enter the atmosphere. In addition, some of these
procedures may produce undesirable waste products, which would need to be disposed of in a safe
manner. Perhaps most importantly, if vast quantities of ocean water are pumped out from various areas
of the ocean, it could negatively impact ocean ecology
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Which of the following protist lineages is appropriately paired with its supportive and/or protective structure?
A) Diatoms have an intricate, chalky, chambered calcium carbonate shell. B) Parabasalids have an internal support rod, made of cross-linked microtubules, that runs the length of the cell. C) Alveolates have tough plates in the cell wall that are made up of cellulose. D) Euglenoids cover themselves with tiny pebbles. E) Dinoflagellates are surrounded by a glass-like, silicone dioxide cell wall.
Acetylcholine binds this membrane protein, which subsequently opens to allow sodium to enter the cell. Acetylcholine exerts its effect on what type of transport protein?
A. ligand-gated channel B. voltage-gated channel C. mechanosensitive-gated channels D. regulatory protein-gated channels E. stretch-sensitive gated channels
If a chloroplast in a protist has four membranes, it arose from:
a. primary endosymbiosis b. secondary endosymbiosis c. tertiary endosymbiosis d. protist cell fusion e. protist organelle replication
If you swim underwater for 200 yards you would expect:a
the of the air in the alveoli to increase. b. the in the tissues to increase. c. the of the air in the alveoli to decrease. d. the in the tissues to increase. e. the of the air in the alveoli to increase and the in the tissues to increase.