The event that initiated biological evolution was the flow of information from DNA to RNA to protein.
a. true
b. false
Ans: a. true
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In many soils there is more than enough phosphorus to support plant growth, but it is tightly bound to soil particles and thus largely unavailable. Which of the following are potential solutions to this problem for vascular plants?
(Select all correct answer options.) A. form symbiotic relationships with mycorrhizae B. form symbiotic relationships with bacteria C. pump H+ into the soil D. raise soil pH
The type of cellular junction prominent in the stomach and kidney is the
A) plasmodesmata. B) gap junction. C) adhesive junction. D) tight junction. E) laminin junction.
Which of the following statements about generalized transduction is false?
A. "Head full" packaging always places only phage DNA into the phage head during phage packaging in generalized transduction. B. Generalized transduction always involves lytic phage. C. Generalized transduction can be used to map bacterial genes. D. Genes that are close together on the bacterial chromosome will have a relatively large cotransduction frequency. E. Two recombination events are necessary to integrate the transferred DNA during generalized transduction.
This photograph shows a leaf-cutter ant carrying a leaf back to its underground garden, where the leaf will be digested by the fungi that live there. Why does the leaf-cutter ant do this?
a. Feeding leaves to the fungi prevent them from digesting the ant’s young.
b. The fungi emit pheromones that repel the ant’s natural predators.
c. Leaf-cutter ant eats the fungi that grow on these leaves in its garden.
d. The fungi have infected the ant’s nervous system to control it like a puppet.