An allosteric enzyme most clearly displays positive cooperativity when:
A. Km= K0.5.
B. an increase in substrate increases the rate of reaction.
C. a decrease in substrate concentration is observed soon after initiating the reaction.
D. a minimal increase in modulator is associated with a large increase in V0.
E. a minimal decrease in modulator is associated with a large increase in V0.
D
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Why is potassium deficiency in plants most common on light, sandy soils?
A. percolation of water through sandy soils leaches potassium from the soil. B. roots grown in sandy soil can't absorb potassium. C. potassium ions are too tightly bound to sand particles to be used by plants. D. plants grown in sandy soil don't require potassium.
The phenotype of vestigial (short) wings (vg) in Drosophila melanogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy (h) body
Assume that a cross is made between a fly with normal wings and a hairy body and a fly with vestigial wings and normal body hair. The wild-type F1 flies were crossed among each other to produce 1024 offspring. Which phenotypes would you expect among the 1024 offspring, and how many of each phenotype would you expect?
Which one of the following is a function of proteins?
a. energy storage b. enzymatic activity c. genetic coding d. insulation
Where is the pancreas located?
a. between the liver and the small intestine b. between the stomach and the small intestine c. between the stomach and the liver d. between the gallbladder and the liver