Health agencies in the US and Canada recommend that people (particularly children and pregnant women) should not eat tuna on a regular basis (le more than once a week) because of mercury (a heavy metal that can be poisonous) contamination Other fish like salmon are safe to eat regularly

Draw a simple food chain consisting of at least four trophic levels, including the organisms mentioned above. Label the trophic levels

Draw a food chain and illustrate why tuna may have more mercury contamination than salmon or trout

Which of the following statements regarding anfinsen's denaturing experiments with ribonuclease a (rnase a) are valid? exposing the denatured protein to air oxidation and then dialysis to remove urea restored the protein to its original functionality. removing urea by dialysis and then allowing air oxidation of the denatured protein restored the protein to its original functionality. denaturing the protein with both urea and β-mercaptoethanol yielded an inactive protein. anfinsen concluded that protein folding is determined by its primary sequence.

Solutions to environmental problems in europe must

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots