All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #1 : Help With Organic Proteins
Which of the following amino acids can participate in the formation of a disulfide bridge?
Cysteine
Phenylalanine
Alanine
Aspartic acid
Tyrosine
Cysteine
Cysteine's R-group contains a sulfhydryl group (-SH), which can participate in the formation of a disulfide bridge in a protein's tertiary and/or quaternary structure. Cysteine is the only amino acid to contain a sulfur atom.
Example Question #641 : Organic Chemistry
Which substrate, when subjected to ozonolysis followed by treatment with dimethyl sulfide, would give only one hydrocarbon product?
2-octene
3-octene
1,3-octadiene
1,7-octadiene
4-octene
4-octene
Ozonolysis is essentially used to cleave a compound at the location of a double bond. For the result to be a single product, the cleavage must occur at a point of symmetry.
4-octene, a symmetrical alkene, would give two equivalents of butanal upon ozonolysis. All of the other compounds are unsymmetrical and would give at least two different non-identical products.
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All GRE Subject Test: Chemistry Resources
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