Sequences of chemical reactions, called metabolic pathways, can be sped up, or catalyzed, by (A) __________ , which are made mostly of (B) ___________.
A) Enzymes
B) Proteins
To find the answer to this question, we need to understand the concept of metabolic pathways and how they are catalyzed.
(A) The missing term refers to something that speeds up or catalyzes metabolic pathways. The term we are looking for here is "enzymes." Enzymes are biological catalysts that facilitate and accelerate chemical reactions in living organisms. They help in converting reactants (substrates) into products during metabolic pathways.
To find the answer to (B), we need to determine what enzymes are made mostly of.
(B) Enzymes are proteins, so they are made mostly of amino acids. Amino acids are the building blocks of proteins, and enzymes have specific sequences of amino acids that give them their unique 3D structure and catalytic activity.
In summary, sequences of chemical reactions called metabolic pathways can be sped up or catalyzed by (A) enzymes, and enzymes are made mostly of (B) amino acids.