The accompanying figure shows what happens in insect populations when crops are sprayed with insecticides. This is an example of ___
A. founder effect
B. genetic drift
C. gene flow
D. natural selection
D. natural selection
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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
Which is true of the following reaction: Pi + ADP -> ATF?
A. It has a change in free energy that is less than 0. B. It has a change in free energy that is greater than 0. C. It can be used to drive endergonic reactions. D. It yields energy. E. It has a change in free energy that is greater than 0, and hence can be used to drive endergonic reactions.
From this study, which treatment appears to be the most effective against Dutch elm disease?
a. treatment A b. treatment B c. treatment C d. They are all totally ineffective
In the plasma membrane, what is the function of integral proteins?
a. Moving materials into or out of the cell b. Forming specialized sites on the cell surface c. Regulating the temperature of the cell d. Forming a static structure around the cell