Pollen from one species germinates on the stigma of another related species and sexually fertilizes the ovule. Most of the resulting plants are sterile but some of the resulting offspring undergo chromosome duplication resulting fertile plants. The fertile offspring are known as

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#Question id: 158

#Unit 1. Molecules and their Interaction Relevant to Biology

At the isoelectric pH of a tetrapeptide:

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#Question id: 159

#Unit 1. Molecules and their Interaction Relevant to Biology

The chirality of an amino acid results from the fact that its alpha carbon:

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#Question id: 160

#Unit 1. Molecules and their Interaction Relevant to Biology

Of the 20 standard amino acids, only ___________ is not optically active.  The reason is that its side chain ___________.

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#Question id: 161

#Unit 1. Molecules and their Interaction Relevant to Biology

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

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#Question id: 162

#Unit 1. Molecules and their Interaction Relevant to Biology

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

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#Question id: 163

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statements about cystine is correct?