Question

what energy molecule fuels all cellular work, including muscle contractions?
lactic acid
adp
atp
carbon dioxide
2
multiple choice 1 point
what would marathon runners eat the night before a race to give them energy?
proteins
carbohydrate - sugars
carbohydrate - starches
lipids
3
multiple choice 1 point
what would a sprinter eat to give him energy right before a race?
pasta
apples
olive oil

Explanation:

• Question 1: ATP (adenosine triphosphate) is the energy - carrying molecule in cells. Lactic acid is a by - product of anaerobic respiration. ADP (adenosine diphosphate) can be converted to ATP but is not the fuel. Carbon dioxide is a waste product.
• Question 2: Marathon runners eat carbohydrate - starches the night before a race. Carbohydrates are a major source of energy. Starches are complex carbohydrates that can be broken down over time. Proteins are for building and repairing tissues. Sugars (simple carbohydrates) are used more quickly. Lipids are a long - term energy store but are not the immediate choice for a marathon's energy needs.
• Question 3: A sprinter would eat apples (which contain simple sugars like fructose) right before a race. Simple sugars are quickly metabolized to provide immediate energy. Pasta is a complex carbohydrate (starch) which is better for long - term energy (like for a marathon runner the night before). Olive oil is a lipid and is not a quick - energy source.

Answer:

1. ATP
2. carbohydrate - starches
3. apples