5.2.2 Respiration

Question 1

ATP uses

Answer 1

Movement - muscle contraction
Active transport
Endocytosis & exocytosis
Cell division - mitosis & meiosis
Synthesis of biological molecules - proteins
DNA replication
Maintenance of body temp (thermoregulation)

Question 2

Respiratory substrates

Answer 2

Carbohydrates
Lipids
Proteins

Question 3

Carbohydrates as respiratory substrates

Answer 3

Used in glycolysis - glucose or starch can be hydrolysed to release glucose

Question 4

Lipids as respiratory substrates

Answer 4

Hydrolysed into glycerol and fatty acids
Glycerol converted into TP & enter glycolysis to make pyruvate
Fatty acids bind with coenzyme A % converted into acetyl coenzyme A to enter Krebs cycle

Question 5

Proteins as respiratory substrates

Answer 5

Hydrolysed into amino acids - delaminated to release keto acids - used in Krebs cycle

Question 6

Respiratory Quotient (RQ)

Answer 6

Ratio of carbon dioxide molecules produced compared to oxygen molecules taken in during respiration
RQ = CO2 produced/O2 consumed
Carbs = 1
Lipids = 0.7
Proteins = 0.8-0.9
If anaerobic respiration takes place - value above 1