A drug binds to the active site of an enzyme. If it is bound to the active site of the enzyme, it prevents substrate binding. This drug would be considered a
A. noncompetitive inhibitor.
B. allosteric inhibitor.
C. allosteric activator.
D. competitive inhibitor.
D
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Which of the following accounts for why eukaryotic cells are typically much larger than prokaryotic cells?
A. Since eukaryotic cells have more DNA, their cell volume has to be larger. B. A eukaryotic nucleus is so large that the cell has to be bigger. C. Reproducing sexually requires the cells to be larger. D. Using molecular motors, eukaryotic cells can transport materials throughout their cytoplasm much faster than prokaryotic cells can, which have to rely on simple diffusion. E. None of the answers options is correct..
Which respiratory surface lacks physical protection from the external environment?
a. tracheal system tubes b. human lungs c. external gills d. internal gills e. bird lungs
Which of the following is only partially reabsorbed in the proximal convoluted tubule?
a. glucose b. amino acids c. sodium ions d. vitamins e. nutrients
Assuming independent assortment for all gene pairs, what is the probability that the following parents, AABbCc × AaBbCc, will produce an AaBbCc offspring?
A) 1/2 B) 1/16 C) 1/8 D) 3/4