Carbohydrates are stored in the liver and skeletal muscle cells in the form of

A. A static state with no deviation from preset points: Homeostasis does not mean absolute constancy. The body allows for small fluctuations around set points, so a static state without deviation does not reflect the true nature of homeostasis.

B. A dynamic state within an unlimited range, depending on circumstances: While homeostasis is dynamic, the body maintains stability within narrow physiological ranges. Unlimited variation would disrupt vital functions and lead to imbalance or disease.

C. The lowest possible energy usage: Energy conservation is important, but homeostasis is not defined by minimizing energy use. Instead, it involves active processes, many of which require significant energy to maintain internal balance.

D. A relatively stable internal environment, within limits: Homeostasis is best described as the body’s ability to maintain a stable internal environment despite external changes. This stability is achieved within narrow limits, ensuring proper cellular and systemic function.

A. Each enzyme is chemically specific: Enzymes act only on particular substrates due to the unique shape of their active sites. This chemical specificity ensures that metabolic reactions occur in a controlled and precise manner.

B. Some enzymes make up part of the plasma membrane: Enzymes can be embedded in the plasma membrane, where they catalyze reactions such as breaking down extracellular substances or facilitating signal transduction.

C. Some enzymes are protein plus a cofactor: Many enzymes require non-protein helpers, such as metal ions or vitamins, to function effectively. In such cases, the enzyme is described as a holoenzyme, consisting of the protein part (apoenzyme) plus a cofactor.

D. Enzymes work by raising the activation energy: Enzymes actually lower the activation energy needed for reactions, making biochemical processes proceed more efficiently.