Lab #5 - Animal Metabolism

Question 1

Define metabolism

Answer 1

sum of all chemical reactions

Question 2

What are the two types of chemical reactions in metabolism?

Answer 2

• catabolic reaction (breakdown)
• anabolic reaction(build-up)

Question 3

Give an example of a catabolic reaction

Answer 3

aerobic cellular respiration

glucose + O2 ->->-> CO2 +H2O + E

Question 4

What was the purpose of the lab?

Answer 4

calculate the metabolic rate based on the O2 consumption of the mouse

(O2 is needed to make ATP)

Question 5

In what ways can ATP be made? Which one is most functional?

Answer 5

ATP can be made:

• with O2: aerobic cellular respiration (~36 ATP)
• without O2: anaerobic cellular respiration (~2 ATP)

Question 6

We need _____ to be efficient at making ATP

Answer 6

O2

Question 7

What happens when animal activity goes up?

Answer 7

O2 is required to make E in the form of ATP (+some heat is lost)

Question 8

In which environment did the mouse have a high metabolic rate?

Answer 8

cold temperature; mouse consumed more O2 to make ATP -> muscle contracts -> warms mouse

Question 9

How did we measure metabolic rate?

Answer 9

• determined how quick O2 mouse consumed
• the faster O2 consumed = higher metabolic rate

Question 10

Compare the functions of drierite vs. ascarite.

Answer 10

drierite = removes water vapor (from urine)
ascarite = removes CO2 (exhaled gas)

Question 11

Which process of metabolism was explored in your experiment with the mouse?

Answer 11

catabolic reaction (breaking down) - aerobic cellular respiration

Question 12

Define cellular respiration

Answer 12

process where all living organisms harvest the chemical energy of food and convert it into a more usable form of energy (ATP)

Question 13

Write out the overall reaction for aerobic cellular respiration

Answer 13

glucose + O2 ->->-> CO2 + H20 + E

Question 14

Which of the substances in the equation are you actually measuring in this experiment?

glucose + O2 ->->-> CO2 + H20 + E

Answer 14

measuring O2 (consumption)

Question 15

Why do we need to add ascarite and drierite to the mouse chamber?

Answer 15

we need to remove these gases so they do not occupy the air volume in the chamber; ONLY WANT TO MEASURE O2

Question 16

With a CO2 absorbing substance within the chamber, what happens to the air volume within the chamber as O2 is consumed by the mouse?

Answer 16

With CO2 absorbing substance (ascarite), the air volume in the chamber decreases as mouse consumes O2

any CO2 exhaled get absorbed and CO2 will not contribute to air volume

Question 17

If no CO2 or water absorber has been present, what would have happened to the air volume within the chamber?

Answer 17

air volume would have stayed the same because gas exchange occurred; as O2 decreases, CO2 released and occupies air volume

Question 18

What happened to the respiration rate as the temperature dropped? Explain why this happened

Answer 18

as the temperature decreased, the respiration rate increased (mouse consumed O2 faster)

the more O2 consumed = more cellular respiration, which produce more energy and creates heat

Question 19

What was the purpose of factoring STPD into your calculations? Why did you factor in weight of the animal into your calculations?

Answer 19

used STPD to standardize and compare temperatures with others

factored in weight to consider size of animal in relation to how much oxygen it took in (bigger animal will consume O2 faster bc of its large size)

Question 20

What is metabolism an exchange between?

Answer 20

energy and matter