The classic work of Friedrich Wöhler (1828) that united the fields of biology and chemistry was based on the
A) discovery of yeast ferments.
B) production of urea in the laboratory.
C) discovery of ATP.
D) identification of nucleotide bases.
E) analysis of gene segregation.
B) production of urea in the laboratory.
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All of the following are used as bioluminescent tools for cell biologists except
A) luciferase. B) rhodopsin. C) GFP. D) YFP. E) none of the above
Protein filaments that function in muscular contraction are
A. keratin and actin. B. myosin and collagen. C. elastin and collagen. D. actin and myosin. E. elastin and keratin.
IgE antibodies are the rarest of the five types of immunoglobins and involved in an allergic response.
a. true b. false
The trp operon in E. coli is regulated in such a manner as to allow expression of the genes only when cellular levels of tryptophan are low
When tryptophan levels are adequate, the secondary structure of the mRNA halts translation. This form of regulation is known as A) attenuation. B) transcriptional regulation. C) positive regulatory control. D) allosteric inhibition. E) induction.