In general, a substance that carries an electric charge can dissolve in water. Given this fact, which of the following would most likely NOT dissolve in water?
A) Ionic compounds B) NaCl
C) Nonpolar molecules D) Polar covalent molecules
C
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Which is (are) true of lipids?
A. They are a major structural element of all cell membranes. B. They act as gatekeepers of the cell. C. They demark the inside vs. the outside of the cell. D. They are a heterogeneous group of molecules. E. All of the choices are correct.
Two solutions with similar solute concentrations are separated by a membrane that only water can pass through. One solution (B) Is of greater volume than the other (A). What will happen next?
a) The pressure gradient will drive water A, which will cause the solute concentration of B to increase b) Water will pass to B, increasing its volume. c) Any water that passes to A will create a tension on B, pulling the water back
Deleting or inserting one nucleotide pair in the middle of a gene is an example of which of the following?
a. base substitution b. nonsense mutation c. frameshift mutation d. missense mutation
Most immunologic diseases that exhibit familial tendencies:
A) are caused by immunosuppression. B) involve an overactive immune system. C) are outgrown by the age of 25 years. D) are caused by immune system hypoactivity.