Cells surrounded by plasma membranes and no cell wall need to maintain a certain cell volume because an influx of water would cause the cell to explode. In order to reduce cell volume, these cells increase the activity of their sodium-potassium pumps.
a. true
b. false
Answer: a. true
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One day during the summer you and some friends make ice cream using an electric ice cream maker. To get the ice cream to form, a mixture of salt and ice is packed around the ice cream maker. A few days later you notice a yellow circle of dead grass where the ice cream maker had been placed. You hypothesize that some of the salt and ice mixture spilled onto the grass and ___
A. froze the grass B. was isosmotic to the grass cells causing the yellow circle of dead grass C. was hyperosmotic to the grass cells causing the yellow circle of dead grass D. was hypoosmotic to the grass cells causing the yellow circle of dead grass
All of the following are included in the Basidiomycetes EXCEPT ________.
A. yeasts B. stolons C. smuts D. puffballs
A substance that an organism needs for growth and survival but cannot make for itself is referred to as a(n) ____
a. chemical b. nutrient c. atom d. DNA molecule e. carbohydrate
Exotoxins ______.
A. cause more damage than endotoxins B. are secreted by pathogenic organisms C. are bound to the cell wall of pathogenic organisms D. are host specific E. are bound to the membrane of pathogenic organisms