Why do researchers often include DNase in their antibiotic preparations to eliminate biofilms?
A. The antibiotics cannot readily penetrate the extracellular debris, which often includes DNA from lysed cells.
B. Targeting the bacterial chromosome is the most effective way to kill biofilm bacteria.
C. If the microbe's genome can be destroyed, the cell will die.
D. The antibiotics target the cell wall and the DNase targets the genome, effectively destroying the biofilm.
Answer: A
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Prokaryotic cells are found in organisms of the Domains and Archaea.
Answer the following statement(s) true (T) or false (F)
In eukaryotes, which of the following is NOT a function of the plasma membrane?
A. barrier for separating extracellular and intracellular environments of a cell B. cell-to-cell adhesion C. selective transport D. ATP synthesis E. cell signaling
Fossil evidence places the origin of angiosperms in the Jurassic period, at least 144 million years ago. The major lineages of angiosperms today were in place approximately 100 million years ago. Now, angiosperms make up 95% of all modern plant species. What relationship between angiosperms and animals may have aided the rapid diversification of flowering plants?
A. Animals eating the plants helped to disperse both pollen and seeds. B. Competition with animals helped spread pollen and seeds. C. Animals died off, allowing more plants to survive. D. Animals became carnivores, allowing plants to survive. E. Coevolution with animals helped spread pollen and seeds.
In ascomycetes and basidiomycetes, plasmogamy is followed immediately by karyogamy
____________________ Indicate whether the statement is true or false.