In the conversion of pyruvate to acetyl coenzyme A which species is the oxidizin
ID: 1029031 • Letter: I
Question
In the conversion of pyruvate to acetyl coenzyme A which species is the oxidizing agent?
a.
ATP
b.
NAD+
c.
NADH
d.
NADPH
Which of the following are produced in the eicosanoid pathway?
a.
prostaglandins
b.
steroid hormones
c.
thromboxanes
d.
a and c only
Which of the following is the fat produced in human beings through DeNovo synthesis of fats.
a.
Linoleic
b.
Palmitic
c.
Linolenic
d
.
Arachidonic
How many ATP are produced from complete metabolism of glucose in the presence of oxygen?
Approximately how much glycogen is stored by a well-nourished healthy adult?
50 grams
100 grams
200 grams
500 grams
a.
ATP
b.
NAD+
c.
NADH
d.
NADPH
Which of the following are produced in the eicosanoid pathway?
a.
prostaglandins
b.
steroid hormones
c.
thromboxanes
d.
a and c only
Which of the following is the fat produced in human beings through DeNovo synthesis of fats.
a.
Linoleic
b.
Palmitic
c.
Linolenic
d
.
Arachidonic
How many ATP are produced from complete metabolism of glucose in the presence of oxygen?
Approximately how much glycogen is stored by a well-nourished healthy adult?
50 grams
100 grams
200 grams
500 grams
Explanation / Answer
Ans 1> b - NAD+. Pyruvate Oxidation Reaction: Pyruvate + NAD+ + CoA ----------> Acetyl CoA + NADH + CO2 The carboxyl group is removed from Pyruvate and released as CO2. Then the resultant two carbon molecule is oxidised and the electrons in this oxxidation process is picked up by NAD+ to form NADH. So NAD+ acts as the oxidising agent here getting itself reduced.
Ans 2> d - a and c only. Both prostaglandins and thromboxanes are produced in the eicosanoid pathway(cyclooxygenase pathways) but no steroid hormones are produced. So the answer is both prostaglandins and thromboxanes.
Ans 3> DeNovo synthesis of fatty acids make palmitic acid as the end product in the pathway.So the answer is, b - Palmitic acid
Ans 4> Complete metabolism of glucose in the presence of oxygen produced 38 ATP molecules. Among them 2 are produced each from glycolysis step and the krebs cycle. And about 34 ATP molecules are produced in the electron transport chain.
Ans 5> In a well nourished healthy adult the liver stores about 100 g of glycogen and the muscles store about 400 g of glycogen. So this makes a total of around 500 g of glycogen. So the answer is 500 grams.