Lymphocyte receptors are encoded by genes that are assembled by rearrangement and mutation of what molecules?  

A.  pre-mRNA
B.  mRNA
C.  tRNA
D.  DNA


D.  DNA

Biology & Microbiology

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The conversion of a diamond into graphite is a spontaneous reaction. Why are most women walking around with

diamond rings and not graphite rings?

a. inorganic substances, like diamonds, do not react like organic substances b. the transition state is very stable c. the energy of activation is very high d. the free energy of this reaction is too low e. the free energy of this reaction is too high

Biology & Microbiology

Condensation and hydrolysis are accomplished in

cells by a. bonding attraction. b. the action of enzymes. c. spontaneous action. d. functional group interactions. e. all of these.

Biology & Microbiology

An F? donor includes F DNA plus a segment of bacterial chromosome DNA. If conjugation is interrupted before the entire F? chromosome transfers, what could be the expected consequences?

A) integration of some but not all F? genes into the recipient's chromosome B) a smaller F? plasmid than had been present in the donor C) failure of the F? strand to circularize in the recipient D) change of the recipient from F– to F+ E) formation of a recipient that is a stable partial diploid

Biology & Microbiology

________ is a floating, surface microbial community that drifts with the currents and waves.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology