A researcher studying bacterial toxin predicts that a lysine within the toxin is important for binding it’s target cell.  She used site-directed mutagenesis to change a codon for lysine (AAA) to one for asparagine (AAU).  However, the mutant toxin still binds to its target cell just as well as the wild-type toxin bound and appears to have no other changes. This type of mutation is probably

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#Question id: 23921

#Aptitude

The most efficient method of biodegradable urban solid waste management is:

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#Question id: 10399

#6. System Physiology – Plant

Which type of the response shown by mutant phyA?

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#Question id: 11108

#7. System Physiology – Animal

The most important chemical stimuli leading to increased rate and depth of breathing is:

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#Question id: 1414

#4. Cell Communication and Cell Signaling

Which of the following genes encodes a caspase in C. elegans?

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#Question id: 12577

#10. Ecological Principles

During  a  field  trip,  an  instructor  touched  a  moth  resting  on  a  tree  trunk.  The  moth  raised  its  forewings  to  reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings. One student answered that sensory  receptors  had  fired  and  triggered  a  neuronal  reflex  culminating  in  the  contraction  of  certain  muscles.  A second student responded that the behaviour might frighten predators. Which statement best describes these explanations?