Hexokinase is an enzyme that binds specifically to glucose and converts it into glucose 6-phosphate. The activity of hexokinase is suppressed by glucose 6-phosphate, which binds to hexokinase at a location that is distinct from the active site. This is an example of
A. feedback inhibition.
B. competitive inhibition.
C. cofactor binding.
D. allosteric activation.
A
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Consider the food chain of grass ? grasshopper ? mouse ? snake ? hawk. About how much of the chemical energy fixed by photosynthesis of the grass (100 percent) is available to the hawk?
A) 0.01% B) 0.1% C) 1% D) 10% E) 60%
Which of the following organisms would you expect to have the largest surface-area-to-volume ratio? Assume that all of the following are the same total length
A) a mollusk B) an annelid C) an arthropod D) a platyhelminth
In a ________ reaction, two small molecules are joined by a covalent bond, and a water molecule is released
a. hydrolysis b. dehydration c. decomposition d. liquidification
Which of the following correctly lists organisms from least complex in overall development to most complex?
A) hydras, sponges, lobsters B) sponges, hydras, clams C) sponges, clams, hydras D) sponges, hydras, tunicates