The body weight of offspring of bird species is range between 12 gm to 18 gm. In a laboratory experiment, species was subjected to selection pressure having influence on the offspring body weight. After many generations of experimental selection pressure, the body weight range between 16 gm to 24 gm. Which of the following natural selection operate on this species?

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#Question id: 161

#XL - T Zoology

Two amino acids of the standard 20 contain sulfur atoms.  They are:

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#Question id: 162

#XL - T Zoology

All of the amino acids that are found in proteins, except for proline, contain a(n):

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#Question id: 163

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Which of the following statements about cystine is correct?

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#Question id: 164

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The uncommon amino acid selenocysteine has an R group with the structure —CH2—SeH (pKa = 5).  In an aqueous solution, pH = 7.0, selenocysteine would:

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#Question id: 165

#XL - T Zoology

Amino acids are ampholytes because they can function as either a(n):

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#Question id: 166

#XL - T Zoology

For amino acids with neutral R groups, at any pH below the pI of the amino acid, the population of amino acids in solution will have: