At the isoelectric pH of a tetrapeptide:
A) only the amino and carboxyl termini contribute charge.
B) the amino and carboxyl termini are not charged.
C) the total net charge is zero.
D) there are four ionic charges.
E) two internal amino acids of the tetrapeptide cannot have ionizable R groups
Ans: C) the total net charge is zero.
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The difference between microevolution and macroevolution is that
A) microevolution affects bacteria and macroevolution affects larger organisms. B) microevolution happens slowly and macroevolution happens quickly. C) macroevolution happens slowly and microevolution happens quickly. D) microevolutionary changes are small, and macroevolutionary changes are large.
A central vacuole of a mature plant cell
A. stores genetic information. B. produces protein. C. produces energy from nutrients. D. produces turgor pressure. E. produces mRNA.
Recognition of self versus non-self is accomplished by ____
a. macrophage function b. complement system activation c. B and T cell cloning d. the presence of MHC markers on cell membranes e. memory cell formation
____________________ involves the fertilization of the egg outside the body, followed by transfer of the embryo into
a woman’s uterus. Fill in the blank(s) with the appropriate word(s).