When performing protein sequence alignment of distantly related proteins, which substitution matrix should What is the most common way to describe biological features like species, cell types and biological you use? pathways Photo album of the experimental protocol A minimum of several keywords per feature BLOSUM80 PAM1 What characterizes a categorical variable? How does a target-decoy database search determine the FDR? It is qualitative and can assume any value (potentially in an interval). By comparing the number of decoy hits to the number of target hits above a given score threshold It is quantitative and can assume any value (potentially in an interval). By counting the percentage of decoys above a given threshold It is qualitative and can assume a limited number of values in the form of categories. By multiplying the number of decoy hits above a given score threshold by 0.01 (as given limit)