AP BIOLOGY

Detailed explanation-1: -An enzyme is a protein that speeds up a biochemical reaction. It is a biological catalyst. An enzyme generally works by reducing the amount of activation energy needed to start the reaction. Figure 3.10.

Detailed explanation-2: -Cytoplasm is a gel-like substance present in all cells. All of the cell organelles are suspended in the cytoplasm. Most of the cellular activities as metabolic pathways like glycolysis, key processes like cell division occur in the cytoplasm. Hence, it is the place, where life-sustaining biochemical reactions occur.

Detailed explanation-3: -A fundamental task of proteins is to act as enzymes-catalysts that increase the rate of virtually all the chemical reactions within cells.

Detailed explanation-4: -Biochemical reactions are specific in nature and occurs spontaneously. They takes place at body temp. (310K/37∘C) and 1 atm. A biochemical reaction is the transformation of one molecule to a different molecule inside a cell (hence, body temperature).