Which process involves an increase in entropy of the system?
A) freezing of ice
B) any spontaneous process
C) combustion of paper
D) formation of raindrops
E) synthesis of cellulose
Answer: C
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Three critical amino acids in the active site of an enzyme are leucine, tryptophan, and alanine. Which of the following characteristics would you predict the substrate to possess in order to bind the active site of this enzyme?
A. relatively hydrophobic B. hydrophilic, with a negative charge C. hydrophilic, with a positive charge D. hydrophilic, but without a charge
On your way to class, you decide to cross a busy street but fail to notice a fast-moving car coming toward you
When you do see the car, your heart rate and breathing increase, and you feel a burst of energy that helps you quickly move to the sidewalk. Describe how your nervous system was able to process the sight of the car with the need to move your legs.
A strain of Drosophila known as dunce produces one-half the amount of cAMP phosphodiesterase found in wild-type flies, which causes a learning defect
Another strain of Drosophila known as rutabaga produces a defective adenylyl cyclase protein (one of the AC types expressed in most cells) and also causes a learning defect. A dunce–rutabaga double mutant fly has relatively normal learning. Explain these curious observations. What will be an ideal response?
If you were a researcher trying to design a pesticide that would not accumulate by biological magnification, what two properties should the pesticide have?
What will be an ideal response?