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
A
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The venom of black widow spiders (Latrodectus mactans) contains an enzyme that hydrolyzes lecithin to the phospholipid lysolecithin. The lysolecithin lyses red blood cells, destroying them. One possible mechanism whereby lysolecithin disrupts the plasma membranes of red blood cells is that it
A) is toxic to red blood cells. B) may act in a manner similar to detergents. C) binds calcium ions, compromising membrane integrity. D) acts as a second messenger to stimulate apoptosis. E) None of the above is a possible mechanism.
Which of the vertebrates senses is the least well understood?
A. electroreception B. magnetoreception C. vision D. hearing E. touch
The cytoplasm of a cell is made up of which of the following?
a) the plasma membrane and cytosol b) the cytosol and the nucleus c) the plasma membrane and organelles d) the cytosol and organelles e) the organelles and the nucleus
Explain why male lions, after they have entered a new pride of female lions, will often engage in the practice of infanticide
What will be an ideal response?