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TLS Online TPP Program

#Question id: 12590

Species introduced to new geographic locations

#Unit 10. Ecological Principles
  1. Are usually successful in colonizing the area.
  2.  Always spread because they encounter no natural predators.
  3. Increase the diversity and therefore the stability of the ecosystem
  4. Can out-compete and displace native species for biotic and abiotic resources
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TLS Online TPP Program

#Question id: 5772

#Unit 8. Inheritance Biology

A missense mutation in Neurospora will revert by treatment with nitrous acid (causes transversions), but not by hydroxylamine (causes AT -> GC transitions). The original mutation (not the reversion) must have been
TLS Online TPP Program

#Question id: 15383

#Unit 8. Inheritance Biology

You are trying to develop true breeding blue hydrangeas, but the plants in one corner of your plot consistently turn pink regardless of your mating strategy. Which of the following would you suspect?
TLS Online TPP Program

#Question id: 19101

#Unit 6. System Physiology – Plant

which are specialized bacteria that are obligate parasites of the phloem tissue?
TLS Online TPP Program

#Question id: 19109

#Unit 8. Inheritance Biology

Assume that mating is random. Colorblindness is an X-linked recessive trait that is found in about 5 percent of males. What fraction of females are homozygous for the colorblindness allele?  
TLS Online TPP Program

#Question id: 18722

#Unit 13. Methods in Biology

Which DNA ligase enzyme is used in genetic engineering?