You want to know whether the virulence genes present in Bordetella pertussis are evolutionarily related to genes in the less pathogenic species B. bronchiseptica or if the virulence genes were acquired via horizontal gene transfer
What characteristic(s) would you compare to answer this question?
A) percentage of GC content and codon usage
B) genome size and number of introns
C) number of genes in the pan genome
D) ribosomal binding site and intron sequence
Answer: A
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When the concordance rate of a trait is significantly higher in identical twins than it is in fraternal twins, we can conclude that:
A. the trait has a strong genetic component. B. the trait has a strong environmental component. C. the trait has a strong genotype-byenvironment interaction. D. the trait has a strong norm of reaction. E. the trait has both a strong genetic component and a strong norm of reaction.
How does a gastrovascular cavity differ from a
complete digestive tract?
a. a gastrovascular cavity has an opening that serves as a mouth and an anus b. the complete digestive process is slower in a gastrovascular cavity c. there is less specialization of parts in a gastrovascular cavity d. the four functions of digestion are not simulataneous in a gastrovascular cavity as they are in a complete digestive tract e. all of these are differences between a gastrovascular cavity and a complete digestive tract
Contraction of the diaphragm causes
A. a person to exhale. B. the size of the chest cavity to increase. C. air to flow from the lungs to the outside. D. compression of the lungs.
If a mutation decreased the radius of a xylem vessel threefold, there would be an 81-fold increase in the volume of liquid moving through the vessel.
Answer the following statement true (T) or false (F)