Respiration

Question 1

What is respiration

Answer 1

the breaking down of food molecules ( glucose) to release the energy in them

Question 2

Why must energy be released

Answer 2

all cells need it to function

Question 3

when does it occur

Answer 3

all the time ( day and night)

Question 4

Where does it occur

Answer 4

Inside every living cell

Question 5

Where in the cell does resp occur

Answer 5

Mitochondria and cytosol

Question 6

What is aerobic and anaerobic resp

Answer 6

• Occurs in the presence of O2
• Occurs in the absence of O2

Question 7

What is the main role of enzymes

Answer 7

Speed up reaction ( the release of energy)

Question 8

Give the word and chemical equation for respiration

Answer 8

• Glucose + Oxygen —-> Water + Carbon dioxide + Energy
• C6H12O6 + 6O2——-> 6H2O + 6CO2 + 38ATP

Question 9

What are the 3 phases that aerobic resp

Answer 9

Glycolisis
Krebs cycle
oxidative phosphorlyation

Question 10

What is anaerobic resp also known as

Answer 10

fermentation

Question 11

how does anaerobic occur in plants and animals

Answer 11

Plants:
- Glucose is brokend into ethanol ( alcohol) and CO2 is released
- imp in bread making where yeast is kneaded into the dough, yeast enzyme brakes down starch into glucose and CO2 is released
- Alcoholic fermentation
- C6H12O6 ——-> CO2 + ETHANOL + 2ATP

Animals:
- Glucose is broken down into lactic acid ( by lactic acid fermentation)
- Lactic acid = paralysing effect on muscle cells, pain and fatigue; limited time period; till O2 debt passes
- Once O2 is available again lactic acid can undergo aerobic respiration
- C6H12O6 ——-> Lactic acid + 2ATP

Question 12

Explain metabolism fully

Answer 12

• Chemical activity inside an organism
• 2 parts : anabolism; catabolism
• Anabolism = large complex molec formed from small molec
• Catabolism = large molec are broken down into smaller molec

Question 13

learn investigations!!!!!!

Answer 13

And worksheets!!!!1