61
The respiratory exchange ratio (RER) is the ratio of:
Answer: volume of carbon dioxide produced ÷ volume of oxygen consumed
Questions
62
Resting oxygen uptake for a 70 kg person is approximately:
Answer: 0.25 l.min-1
63
Approximately how much energy is liberated when one gram of carbohydrate is completely oxidised?
Answer: 16 kJ
64
Muscle and liver glycogen stores in a well nourished athlete would be sufficient to sustain approximately how many minutes of submaximal exercise (if this were the only energy source used)? The exercise is club level marathon pace.
Answer: 90 minutes
65
How many ATP molecules can be derived from each molecule of acetyl CoA that enters the Krebs’ Cycle?
Answer: 12
66
Pairs of electrons carried in the form, FADH2 and NADH+H, collectively contain enough free energy to rephosphorylate:
Answer: 5 ATP
67
Which of the following statements is false?
Answer: oxygen is consumed in the TCA cycle
68
Substrate-level phosphorylation differs from oxidative phosphorylation in that:
Answer: oxidative phosphorylation involves the transfer of electrons
69
The oxidative deamination of the amino acid alanine in muscle produces:
Answer: one molecule of pyruvic acid and a molecule of ammonia
70
Which of the following is not a true statement?
Answer: insulin promotes glucose uptake by all tissues in the body
72
How many CO2 and ATP molecules are formed during one complete turn of the tricarboxylic acid cycle (Krebs’ cycle)?
Answer: 2CO2 and 1ATP
73
Which of the following factors stimulate insulin secretion?
Answer: both (a) and (b)
74
The average intensity of exercise during professional soccer play is about:
Answer: 75%VO2max
75
With an increasing number of sprints the:
Answer: relative contribution of aerobic metabolism increases
76
The pyruvate dehydrogenase complex:
Answer: catalyses the conversion of pyruvate to acetyl CoA
77
Phophocreatine resynthesis during recovery from exercise is inhibited by:
Answer: a lack of oxygen
78
The recommended dose of creatine to load the muscles of a 70 kg man within one week is:
Answer: 20 g/day
79
An expected side effect of creatine supplementation is:
Answer: gain in body mass
80
In a double stranded molecule of DNA, the ratio of purines : pyrimidines is:
Answer: always 1:1
