Respiration

Question 1

Describe the role of ATP in cells

Answer 1

-Universal energy currency
-Phosphates removed by hydrolysis
-Used to drive metabolic reactions
-30.5KJ / 13.8 KJ
-ADP can attach to a phosphate during respiration
-Released in small packets

Question 2

Bond between phosphates

Answer 2

phophoanhydride bonds

Question 3

What happens at the cristae

Answer 3

Oxidative phosphorylation

Question 4

Respiratory quotient

Answer 4

CO2/O2

Question 5

How does vasoconstriction prevent heat loss

Answer 5

By radiation

Question 6

Sugar and ethanol relationship - yeast

Answer 6

-Sugar converted to ethanol in anaerobic respiration
-Sugar undergoes glycose
-Pyruvate decarboxylated
-NAD recycled

Question 7

Why is glucose the chief respiratory substrate

Answer 7

It can enter glycolysis without having to be broken down first

Question 8

Facultative anaerobe

Answer 8

will respire aerobically in the Prescence of O2 (Krebs ; Links; glycolysis)
If O2 absent will respire anaerobically (ethanol; glycolysis)

Question 9

Why is there a faster production rate of yeast in aerobic conditions

Answer 9

To divide need ATP so amount of ATP available depends on how much yeast there is

Question 10

Aerobic vs anaerobic conditions (yeast)

Answer 10

1) In the presence of O2 yeast can oxidise the ethanol and any sugar in the cycle - will not be killed by the cider

2) Anaerobic - yeast cannot oxidise the ethanol - kill the yeast

Question 11

Yeast experiment

Answer 11

-Conical flasks with 50 cm3 of cider and one drop of yeast suspension
-Muslim cloth - keeps out containments but allows O2 to enter
-Mix
-Place a drop on haemocyter slide with a coverslip
-Count number of yeast cells in centre and each corner square