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TLS Online TPP Program

#Question id: 11995

You are working for the Environmental Protection Agency and researching the effect of a potentially toxic chemical in drinking water. There is no documented scientific evidence showing that the chemical is toxic, but many suspect it to be a health hazard. Using the precautionary principle, what would be a reasonable environmental policy?

#Unit 10. Ecological Principles
  1. Establish no regulations until there are conclusive scientific studies.
  2. Set the acceptable levels of the chemical conservatively low,  and keep them there unless future studies show that they can be safely raised.
  3. Set  the  acceptable levels  at  the  highest levels  encountered, and  keep  them  there  unless future  studies demonstrate negative health effects.
  4. Caution  individuals  to  use  their  own  judgment  in  deciding  whether  to  drink  water  from  a  potentially contaminated area
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TLS Online TPP Program

#Question id: 240

#Unit 1. Structure and Function of Biomolecules

Purines and pyrimidines exist in two tautomeric forms (lactam and lactim); nucleosides exist in two conformations (syn and anti). The most common forms found in cells are
TLS Online TPP Program

#Question id: 241

#Unit 1. Structure and Function of Biomolecules

In DNA, phosphodiester bonds form with hydroxyl groups of carbons number ________ and ________ of each deoxyribose sugar.
TLS Online TPP Program

#Question id: 242

#Unit 1. Structure and Function of Biomolecules

Cells fed5-methyl uracil (radioactive in the methyl group) will form radioactive ________.
TLS Online TPP Program

#Question id: 243

#Unit 1. Structure and Function of Biomolecules

Deoxythymidine is a ________ found mainly in DNA.
TLS Online TPP Program

#Question id: 244

#Unit 1. Structure and Function of Biomolecules

The difference between dGMP and GMP is
TLS Online TPP Program

#Question id: 245

#Unit 1. Structure and Function of Biomolecules

Adenylate and AMP each contain ________ phosphate groups.