catalyze reactions by lowering the necessary for a reaction to occur. The molecule that an enzyme acts on is called the . In an enzyme-mediated reaction, molecules are changed, and is formed.

What part of the plant has the most chloroplsts?

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism