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TLS Online TPP Program

#Question id: 4961

An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to

#Unit 11. Evolution and Behavior

  1. make life on land difficult for aerobic organisms.

  2. change the atmosphere from oxidizing to reducing.

  3. make it easier to maintain reduced molecules

  4. cause iron in ocean water and terrestrial rocks to rust (oxidize).

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TLS Online TPP Program

#Question id: 24461

#Unit 7. System Physiology – Animal

An 11-year-old male was having difficulty reading the graphs that his teacher was showing at the front of classroom. His teacher recommended he be seen by an ophthalmologist. Not only was he asked to look at a Snellen letter chart for visual acuity but he was also asked to identify numbers in an Ishihara chart. He responded that he merely saw a bunch of dots. Abnormal color vision is 20 times more  common in men than women because most cases are caused by an abnormal
TLS Online TPP Program

#Question id: 12475

#Unit 10. Ecological Principles

Uniform spacing patterns in plants such as the creosote bush are most often associated with
TLS Online TPP Program

#Question id: 561

#Unit 1. Molecules and their Interaction Relevant to Biology

Enzyme X exhibits maximum activity at pH = 6.9.  X shows a fairly sharp decrease in its activity when the pH goes much lower than 6.4.  One likely interpretation of this pH activity is that:
TLS Online TPP Program

#Question id: 19237

#Unit 12. Applied Biology

A type of structure, which may act as a transcription termination signal is
TLS Online TPP Program

#Question id: 19562

#Unit 12. Applied Biology

It has been suggested that interaction of the toxin fragment with the receptor facilitates proteolytic removal of toxin a helix, which triggers toxin oligomerization that leads to