All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #21 : Biological Molecules
Which of the following amino acids can participate in the formation of a disulfide bridge?
Aspartic acid
Alanine
Tyrosine
Phenylalanine
Cysteine
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 #1 : Specific Reactions And Named Reactions
Which substrate, when subjected to ozonolysis followed by treatment with dimethyl sulfide, would give only one hydrocarbon product?
4-octene
3-octene
1,3-octadiene
2-octene
1,7-octadiene
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.
Certified Tutor
Certified Tutor
All GRE Subject Test: Chemistry Resources
![Learning Tools by Varsity Tutors](https://vt-vtwa-app-assets.varsitytutors.com/assets/problems/og_image_practice_problems-9cd7cd1b01009043c4576617bc620d0d5f9d58294f59b6d6556fd8365f7440cf.jpg)