Which of the following statements about transcription in prokaryotes in false?
A) It uses RNA polymerase as the main enzyme.
B) It occurs in the nucleus.
C) It uses DNA as the template to make RNA.
D) It uses a lot of cellular energy.
E) It is tightly regulated by the cell.
Answer: B
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Which of the following hypotheses proposed to explain the evolutionary origin of viruses does not assume the pre-existence of living cells?
A. Viruses evolved from macromolecules. B. Viruses evolved from plasmids that acquired genes for their own replication. C. Viruses evolved by losing all the genetic information that is not absolutely required for reproduction. D. The precursors of cellular DNA genomes may have been RNA molecules. E. Viruses evolved from chromosomal elements.
Fungi are essential in industrial production of food and spirits.
Answer the following statement true (T) or false (F)
Many species of flowering plants reproduce
asexually by __________. Fill in the blank(s) with the appropriate word(s).
When a population evolves predator defenses, this reduces selective pressure and can lead to diversification into new species. This is called:
A. Interference competition B. Ecological release C. Ecological character displacement D. Escape-and-radiate coevolution