Question

what energy molecule fuels all cellular work, including muscle contractions? carbon dioxide atp adp lactic acid 2 multiple choice 1 point what would marathon runners eat the night before a race to give them energy? carbohydrate - sugars proteins carbohydrate - starches lipids

Explanation:

1. ATP (adenosine triphosphate) is known as the energy currency of the cell. It provides the energy for various cellular processes including muscle contractions. Carbon dioxide is a waste product in cellular respiration. ADP (adenosine diphosphate) is formed when ATP loses a phosphate group. Lactic acid is produced during anaerobic respiration in some cells.
2. Carbohydrate - starches are complex carbohydrates. They are broken down into glucose (a simple sugar) during digestion. Glucose can be stored as glycogen in the liver and muscles. Marathon runners eat starches the night before a race because starches are a long - term energy source. Sugars (simple carbohydrates) are a quick - energy source but do not last as long. Proteins are mainly for building and repairing tissues. Lipids are also an energy source but are used more when carbohydrate stores are depleted.

Answer:

1. B. ATP
2. C. carbohydrate - starches