Question

1. which of these explains why marathon runners might eat a pasta dinner before a big race?

○ carbohydrates are high-energy molecules
○ pasta is delicious and helps you get a good sleep
○ pasta and other carbohydrates are low in calories
○ carbohydrates are easy for the body to digest

1. what are the monomers for carbohydrates?

○ triglycerides
○ polypeptides
○ monosaccharides
○ nucleic acids

Explanation:

Question 1

To determine why marathon runners eat pasta before a race, we analyze each option:

• "Carbohydrates are high - energy molecules": Pasta is rich in carbohydrates. Carbohydrates are a primary source of energy for the body, especially for endurance activities like a marathon. This explains why runners eat pasta to get energy.
• "Pasta is delicious and helps you get a good sleep": Sleep is not related to preparing for a race, so this is incorrect.
• "Pasta and other carbohydrates are low in calories": Carbohydrates are not low - calorie; in fact, they are a significant source of calories (energy), so this is wrong.
• "Carbohydrates are easy for the body to digest": While digestion speed can matter, the main reason for eating pasta before a race is its high - energy content from carbohydrates, not just ease of digestion.

Carbohydrates are made up of monomers. The monomers of carbohydrates are monosaccharides (like glucose, fructose).

• Triglycerides are the monomers of lipids (fats), not carbohydrates.
• Polypeptides are related to proteins (their monomers are amino acids), not carbohydrates.
• Nucleic acids have monomers called nucleotides, which are not related to carbohydrates.

Answer:

Carbohydrates are high - energy molecules

Question 2