Which part of the membrane can catalyze chemical reactions? A. Fatty acids
B. Enzymes
C. Phosphilipids
D. Nucleic acids

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

if you listed your answers right then i believe your answer is b.

answerblank(1); ecological; blank(2); evolutionary;