An important group of peripheral membrane proteins are enzymes such as the phospholipases that cleave the head groups of phospholipids. What properties must these enzymes exhibit?
A) resistance to degradation
B) independence from cofactor interaction
C) water solubility
D) lipid solubility
E) membrane-spanning domains
Answer: C
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Which bone is found on the “thumb side” of the forearm?
a. scapula b. humerus c. radius d. ulna e. clavicle
Corn and other grasses have a unique sheath of cells known as the __________ that surrounds and
protects the young shoot. a. coleoptile b. coleorhizum c. cotyledon d. endosperm e. radicle
Determine whether the following statement is true or false: Master regulators such as Ey in Drosophila are so powerful that they can even activate their regulatory networks outside the normal location.
a. true b. false
The A159E mutation causes an A amino acid to be replaced with an E amino acid (their structures are shown here). What effects do you think the A159E mutation will have on the troponin protein?
A) The mutation will not affect troponin function since both the A and E amino acids are hydrophobic and thus the troponin structure will not be affected.
B) The mutation will probably make troponin more stable at low pH and at higher temperatures since the E amino acid is acidic.
C) Since the E amino acid is hydrophilic, it will try to be exposed on the surface of the protein and thus will disrupt the tertiary structure and potentially the function of troponin.
D) If the A amino acid is replaced by the basic E amino acid, then the secondary and tertiary structures will be affected and troponin will likely not fold correctly.