Which of the following statements about COG is incorrect regarding its features?
Options:
A . Currently, there are 4,873 clusters in the COG databases derived from unicellular organisms
B . It is constructed by comparing protein sequences encoded in forty-three completely sequenced genomes, which are mainly from prokaryotes, representing thirty major phylogenetic lineages
C . The interface for sequence searching in the COG database is the COGnitor program, which is based on gapped BLAST
D . It is a protein family database based on structural classification
Answer: Option D Answer: (d).It is a protein family database based on structural classification
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