The three domains of life are
a. eukaryotes, prokaryotes, and viruses.
b. animals, plants, and microorganisms.
c. Prokaryota, Eukaryota, and Protoctista.
d. Archaebacteria, Eubacteria, and Eukaryota.
e. Archaea, Bacteria, and Eukarya.
E
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The lactose analog isopropyl-beta-D-thio-galactoside (IPTG) is often used to regulate gene expression systems in bacteria. IPTG does not act as a substrate for beta-galactosidase, but can bind to, and inactivate, the repressor. In this case, IPTG serves as a(n)
A. inducer. B. repressor. C. DNA-binding protein. D. operon. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about prokaryotic transcriptional regulation? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The virulence of the tubercle bacillus is due to its
A. toxin. B. lysogenic conversion. C. resistance to antibiotics. D. survival within macrophages. E. lysogenic conversion AND resistance to antibiotics.
The primary targets for HIV are ____
a. helper T cells and macrophages b. helper T cells and cytotoxic T cells c. B cells, helper T cells, and cytotoxic T cells d. B cells and helper T cells e. B cells and macrophages
Archaea in the class ________ are thermoacidophiles that lack cell walls, but strengthen their plasma membranes with large quantities of caldarchaeol, glycoproteins, and lipid-containing polysaccharides.
A. Pyrococci B. Thermococci C. Thermoplasmata D. Archaeoglobus