Angiosperm-dominated tropical rainforests were very similar to the gymnosperm-dominated forests that preceded them
A. true
B. false
B
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Rank the elements carbon, phosphorus, calcium, and iodine in order of decreasing number of electrons
A. CPCaI B. ICaPC C. IPCCa
The ionized or dissociated carboxyl group may be written as _____.
A. -COOH B. -OH C. -COO- D. NH4+ E. -C=O
In 2010, a research team led by Craig Venter transplanted an artificial genome into a small bacterial cell. The researchers hope that this technology might eventually lead to practical uses such as _____________.
A. developing artificial human embryos B. developing bacterial strains that could grow in the wild and compete with harmful organisms C. to make pathogenic microorganisms to use as biological weapons D. cleaning up toxic waste or generating biofuels
The RNA sequences of some introns found in bacteria, mitochondria, chloroplasts, and some nuclear genes fold into 3-D structures that catalyze the removal of the introns. Therefore, the intron functions as a
A. spliceosome. B. scaffold. C. ribozyme. D. guide. E. enzyme.