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. DNA-binding protein.
B. repressor.
C. inducer.
D. operon.
Answer: C
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Species of the genus Thiobacillus
A. oxidize inorganic sulfur compounds and produce ATP. B. are ubiquitous in soil, freshwater, and marine environments. C. produce acids that leach metals out of ore. D. All of the choices are correct.
The genetic code is nearly universal
Indicate whether this statement is true or false.
Which one of the following statements about a typical fern life cycle is false?
A. Sori contain sporangia. B. Spores are haploid. C. Gametophytes have rhizomes. D. Gametes are produced by mitosis. E. The sporophyte grows out of an archegonium.
Two oxygen atoms joined to each other by the sharing of two pairs of electrons form a(n):
A. double covalent bond. B. single bond. C. hydrogen bond. D. ionic bond.