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TLS Online TPP Program

#Question id: 164

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:

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. be a fully ionized zwitterion with -1 net charge

  2. be found in proteins as D-selenocysteine.

  3. never be found in a protein.

  4. be nonionic.

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TLS Online TPP Program

#Question id: 5095

#Unit 5. Developmental Biology

Changes in the shape of a cell usually involve a reorganization of the ________.
TLS Online TPP Program

#Question id: 5096

#Unit 5. Developmental Biology

Select the choice that correctly matches the organ with its embryonic sources.
TLS Online TPP Program

#Question id: 5097

#Unit 5. Developmental Biology

The embryonic precursor to the human spinal cord is the ________.
TLS Online TPP Program

#Question id: 5098

#Unit 5. Developmental Biology

The term applied to a morphogenetic process whereby cells extend themselves, making the mass of the cells narrower and wider, is ________.
TLS Online TPP Program

#Question id: 5099

#Unit 5. Developmental Biology

Which of the following is common to the development of birds and mammals?
TLS Online TPP Program

#Question id: 5100

#Unit 5. Developmental Biology

During frog development, the blastocoel ________.