Transamination of an amino acid transfers an amine group to form an α‑keto acid and is catalyzed by transaminases. Some amino acids can be transaminated into compounds that can be used directly in biological pathways, whereas other amino acids need to be converted through several steps. Classify the amino acids into the following two categories.

1. Yields a glycolytic or citric acid intermediate directly upon transamination
2. Requires several steps to yield a glycolytic or citric acid intermediate

a. cysteine
b. histidine
c. asparagine
d. glutamate
e. alanine
f. aspartate