Bt corn is a genetically engineered plant. What feature gives it value as a crop plant?
A) The plant produces a toxin designed to kill monarch butterflies.
B) The plant produces a toxin designed to kill corn borers.
C) The plant produces a toxin designed to kill competing plants (also known as weeds).
D) The plant grows significantly larger ears of corn.
E) The plant produces better-tasting kernels of corn.
B) The plant produces a toxin designed to kill corn borers.
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Chargaff's rules for the pairing of nitrogen bases is
A. A = C and G = T. B. A = T and G = C. C. A = G and C = T. D. A+T = G+C.
Organisms that can grow without oxygen are called ______.
a. anoxyic b. phototrophs c. anaerobes d. cyanobacteria
In the ecosystems of the world, fungi act primarily as
A. primary consumers. B. producers. C. decomposers. D. detritovores. E. secondary consumers.
Answer the following questions true (T) or false (F)
1. Observation of a natural event by more than one human or scientific instrument is the basis of the scientific method. 2. The experiments of Louis Pasteur to disprove spontaneous generation illustrate the process of the scientific method. 3. A theory must be supported by evidence.