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

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#Question id: 11941

#XL - T Zoology

Under conditions of normal renal function, which of the following is true of the concentration of urea in tubular fluid at the end of the proximal tubule?

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#Question id: 151

#XL - T Zoology

The isoelectric point of alanine is pH = 6.15. It is mixed with proline (pHCOOH = 2.0; pHNH2= 10.6), and the mixture is placed in an electric field at pH 6.15. Which statement is true?

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#Question id: 8925

#XL - P Chemistry

What is the probable sequence in which the following clades of animals originated, from earliest to most recent?

1. tetrapods

2. vertebrates

3. deuterostomes

4. amniotes

5. bilaterians

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#Question id: 1691

#XL - Q Biochemistry

What is the structure recognized by the αβ T-cell receptor on the cell surface of an antigen-presenting cell?

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#Question id: 10677

#XL - T Zoology

What interactions occur in epiphyte plants that grow on other plants?