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PLTW Biomedical Science Final Study Guide (2024) Newest Questions and Answers (Verified Answers) $12.99   Add to cart

Exam (elaborations)

PLTW Biomedical Science Final Study Guide (2024) Newest Questions and Answers (Verified Answers)

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What is a calorie? Answer A unit of heat energy 2. With our crude calorimeters in class we burned food by lighting it on fire. What chemical reaction occurs when food is burned? How does this reaction relate to the breakdown of food for energy in our body? AnswerA combustion reaction occurs.Th...

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  • October 27, 2024
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PLTW Biomedical Science Final Study Guide.pdf file:///C:/Users/HP/Desktop/New%20folder%20(4)/PLTW%20Biome




PLTW Biomedical Science Final Study Guide

Questions & Answers


1. What is a calorie?

Answer A unit of heat energy



2. With our crude calorimeters in class we burned food by lighting it on fire.

What chemical reaction occurs when food is burned? How does this reaction

relate to the breakdown of food for energy in our body?

Answer A combustion reaction occurs. The food and oxygen in the air combine to

form carbon dioxide and water molecules and produce lots of energy. This happens in

the body as well, using enzymes to catalyze all of the reactions.



3. If you burned a sample of food and the temperature of 100g of water in your

calorimeter rose from 20oC to 36oC, how many calories were in the food

sample?

Calories = (specific heat of water) x (change in temp of water) x (mass of water)





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Specific heat of water = 1 calorie/goC

Answer Calories = (1 cal/goC) (16oC) (100g) = 1600 calories



4. If the food sample you burned above had a mass of 10g before burning

and 8g after burning, how many calories/gram did the food contain?

Answer 1600 calories/2g = 800 calories/gram



5. We are expressing our calories calculated above as chemistry calories. How are

food calories different?

Answer 1 food Calorie = 1000 chemistry calories



6. Which macromolecules -- carbohydrates, proteins or lipids - have the high-

est calories/gram?

Answer Lipids have the highest 9 Calories/gram.



7. In our bodies the food we eat is broken down into its building blocks as it

passes through our digestive system. Answer the following questions about this

process

Where does digestion begin?





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Answer In the mouth with active chewing and the enzymes in saliva.



8. The enzymes amylase and lipase are found in saliva.Which macromolecules do

these enzymes break down?

Answer Amylase breaks down carbohydrates. Lipase breaks down lipids.



9. In the stomach, lipase and pepsin are secreted.Which macromolecule does

pepsin break down?

Answer Pepsin breaks down proteins.



10. What substance is made in the liver and stored in the gall bladder? What

does it do?

Answer Bile

it helps to dissolve (emulsify) lipids



11. The duodenum is part of which organ in the digestive system?

Answer The small intestine



12. Several enzymes are secreted into the duodenum, including trypsin and





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chymotrypsin.Which macromolecule do these enzymes break down?

Answer Trypsin and chymotrypsin break down proteins.









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