Chemical and Physical Reactions as they Relate to Biology and Li

What is the main difference between a chemical reaction and a physical reaction in biological systems?

• Chemical reactions do not involve energy changes, while physical reactions do.

• Chemical reactions alter molecular structures, while physical reactions do not.

• Physical reactions always involve enzymes, while chemical reactions do not.

• Physical reactions create new substances, while chemical reactions do not.

Which of the following best defines metabolism?

• The sum of all physical processes in an organism.

• The process by which organisms obtain energy from sunlight.

• The total of all chemical reactions in a living organism.

• The process of breaking down food into simpler substances.

What is the primary function of ATP in metabolic reactions?

• Storing genetic information.

• Acting as a structural component of cells.

• Providing energy for biochemical processes.

• Regulating the body’s temperature.

Which of the following is an example of a chemical reaction in biological systems?

• Melting of ice in plant cells

• Breaking of food into smaller pieces by chewing

• Photosynthesis in plants

• The diffusion of oxygen into the bloodstream

Why are biochemical reactions important in energy production and utilization?

• They allow cells to store waste products.

• They break down and synthesize molecules needed for cellular activities.

• They prevent energy loss during physical activities.

• They help organisms absorb more water.

Which of the following is a physical reaction that helps maintain homeostasis?

• Cellular respiration

• Protein synthesis

• Diffusion of oxygen in the lungs

• The breakdown of glucose into ATP

How do anabolic and catabolic reactions contribute to metabolism?

• Anabolic reactions store energy, while catabolic reactions release energy.

• Anabolic reactions break down large molecules, while catabolic reactions build them.

• Both anabolic and catabolic reactions release energy for the body to use.

• Both reactions occur only in animal cells.

Why are photosynthesis and cellular respiration considered interconnected processes?

• They both require oxygen as a reactant.

• The products of photosynthesis are the reactants for cellular respiration.

• They occur in the same organelle.

• They both produce ATP as their main product.

How do enzymes speed up biochemical reactions in digestion?

• By increasing the temperature of the reaction.

• By providing energy to break down molecules.

• By lowering the activation energy required for reactions.

• By preventing chemical reactions from occurring too quickly.

If an organism’s enzymatic reactions were significantly slowed down, what would most likely happen?

• The organism would produce excess ATP.

• The organism’s immune system would strengthen.

• The body would create new enzymes to speed up the reactions.

• Metabolic processes would slow down, affecting energy production.