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#Question id: 378


Which of the following statements about buffers is true?

#Section 4: Fundamentals of Biological Engineering
  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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TLS Online TPP Program

#Question id: 3276

#Section 3: Genetics, Cellular and Molecular Biology

Which of these conditions are always true of populations evolving due to natural selection?

Condition 1: The population must vary in traits that are heritable.

Condition 2: Some heritable traits must increase reproductive success.

Condition 3: Individuals pass on most traits that they acquire during their lifetime.

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#Question id: 3277

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following describes the most likely order of events in allopatric speciation?

TLS Online TPP Program

#Question id: 3278

#Section 3: Genetics, Cellular and Molecular Biology

What does the biological species concept use as the primary criterion for determining species boundaries?

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#Question id: 3279

#Section 3: Genetics, Cellular and Molecular Biology

Which two of the following have operated to increase divergence between mosquito fish populations on island?

a. improved gene flow

b. bottleneck effect

c. sexual selection

d. founder effect

e. natural selection

TLS Online TPP Program

#Question id: 3280

#Section 3: Genetics, Cellular and Molecular Biology

Small populations are threatened by the loss of genetic diversity from

a. Inbreeding

b. Genetic drift

c. Limited mating

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#Question id: 3282

#Section 3: Genetics, Cellular and Molecular Biology

Natural selection results in different forms of plants which can survive in contaminated or uncontaminated soil. Type of natural selection is