Figure 19.4
The area labeled "spark discharge" in the accompanying figure contained all of the following gases found in the ancient Earth atmosphere except:
A. carbon dioxide.
B. methane.
C. ammonia.
D. water vapor.
E. hydrogen gas.
Answer: A
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A compound known as X-gal is widely used in molecular genetic research. When wild-type (normal) E. coli is grown on medium containing X-gal, the bacterial colonies turn blue. In contrast, when lacZ mutants are grown on medium containing X-gal
, the bacterial colonies remain their normal white color. X-gal is likely to be a compound _____. A) chemically similar to glucose B) chemically similar to galactose C) chemically similar to lactose D) that cannot be transported into lacZ mutants E) that can be transported only into lacA mutants
Answer the following statement true (T) or false (F)
Linkage between a gene of interest and a DNA marker is being studied. A mating results in 6 parental and 3 recombinant offspring. The results of this mating are sufficient to conclude with confidence that the gene of interest and the DNA marker are linked.
Physical and chemical antimicrobial agents can target all but which of the following?
A) Protein function B) Cell membrane integrity C) DNA replication D) Capsule formation E) Cell wall synthesis
A ____ is an extracellular signaling molecule that exerts its effect at very low concentrations.
A. statolith B. protein receptor C. plant hormone D. cytochrome E. phytochrome