Question 13 A swimmer you are training for a 100-meter swim even reports that he
ID: 3508745 • Letter: Q
Question
Question 13
A swimmer you are training for a 100-meter swim even reports that he is taking a supplement that improves isocitrate dehydrogenase activity. Assuming that the typical swim time for this individual is 52 seconds the likely effect would be:
A.
Greatly improved swim performance
B.
Worsened swim performance
C.
No change
D.
Not enough information
Question 14
Which of the following reactions will result in the most ATP production?
A.
Breakdown of 30 mols of creatine phosphate (CP)
B.
Complete oxidation of 5.0 mols pyruvic acid or pyruvate
C.
Oxidation of 10 mols of NADH + H+
D.
Breakdown of 2 mols of glucose to 4 mols of lactic acid
Question 15
Why does muscular work become increasingly difficult with lactic acid accumulation?
because lactic acid causes muscle injury
because lactic acid interferes with the diffusion of oxygen into mitochondria.
because lactic acid causes a rise in muscle temperature with renders enzymes involved in the glycolysis and the citric cycle non-functional
because the rising concentration of hydrogen ions leads to a drop in ph which renders enzymes involved in the glycolysis and the citric cycle non-functional
Question 16
A 100-meter sprinter that you are training reports that a friend suggested that he take a supplement called “Sprintex.” The label states that consuming this supplement will “turbocharge your mitochondria.” What effect would this supplement have on the athlete’s sprint performance?
A.
Improve
B.
Worsen
C.
No Change
D.
Can't tell
Question 17
The RQ measured for a subject who has been jogging easily at 70% VO2max for about 40 minutes and is in a steady state will likely be?
A.
over 1.0
B.
close to .7
close to .5
D.
close to .9
A.
Greatly improved swim performance
B.
Worsened swim performance
C.
No change
D.
Not enough information
Explanation / Answer
Answer 13 - It will decrease swimming time.
Explanation - Isocitrate dehydrogenase is an enzyme that catalyse oxidative decarboxylation of Isocitrate to produce Ketoglutrate and CO2. CO2 is stimulator of respiratory system, so as concentration of Isocitrate dehydrogenase increases then CO2 produced will also increase therefore person will feel need to respire too soon an this will decrease swimming time.
Answer 14 - Breakdown of 30 mols of CP.
As CP is most efficient in production of ATP and generates Larhe number of ATP per CP molecule.
Answer 15 - lactic acid raises H+ level in muscle.
Explanation - As the ame suggest Lactic Acid is ACID hence it increases H + ion concentration in muscles. All enzyme functions best/maximum at neutral pH, above or below this pH decrease the efficiency of the enzymes. Lactic acid decrease the pH of muscle henc efficiency of enzymes decreases.
Answer 16 - Improve (assuming that turbo charge mitochondria means increase in its efficiency).
Explanation - Mitochondria is called as powerhouse of the cell as it synthesize ATP molecule. So if the efficiency of mitochondria is increased then total ATP produced will also increase and ATP will be utilized for sprinting.
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