TLS Online TPP Program

#Question id: 378


Which of the following statements about buffers is true?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. A buffer composed of a weak acid of pKa = 5 is stronger at pH 4 than at pH 6.

  2. At pH values higher than the pKa, the salt concentration is higher than that of the acid.

  3. The strongest buffers are those composed of strong acids and strong bases.

  4. When pH = pKa, the weak acid and salt concentrations in a buffer are equal.

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#Question id: 21241

#Unit 7. System Physiology – Animal

A 45-year-old female who had never needed to wear glasses experienced difficulty reading a menu in a dimly-lit restaurant. She then recalled that as of late she needed to have the newspaper closer to her eyes in order to read it. A friend recommended she purchase reading glasses. Visual accommodation involves