Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Maximum amount of energy/ATP is liberated on oxidation of

  1. Fats

  2. Proteins

  3. Starch

  4. Vitamins
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Fats are complex molecules composed of fatty acids and glycerol. The body needs fats for growth and energy.
Fats are the slowest source of energy but the most energy-efficient form of food. Each gram of fat supplies the body with about 9 grams of energy. 
The oxidation of fats releases the maximum amount of energy.
So, the correct option is 'Fats'
Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Number of ATP molecules which can be built on complete oxidation of pyruvic acid is

  1. 6

  2. 2

  3. 15

  4. 30
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The breakdown glucose takes place during glycolysis in which there is a net gain of 8 ATP. The pyruvic acid so formed undergoes oxidative decarboxylation and thus forms acetyl CoA. This reaction leads in the formation of 2 NADH₂ molecules. It results in the formation of 6 ATP.

Therefore if the complete oxidation of pyruvic acid takes place when there is a net gain of 15 ATP.
So, the correct option is '15ATP'

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Out of 36 ATP molecules produced per glucose molecule during respiration

  1. 2 are produced outside glycolysis and 34 during respiratory chain

  2. 2 are produced outside mitochondria and 34 inside mitochondria

  3. 2 during glycolysis and 34 during Krebs cycle

  4. All are formed inside mitochondria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

2 ATP from glycolysis which takes place in the cytoplasm and other cellular respiration processes takes place in mitochondria which gives 34 ATP.

So, the correct option is '2 are produced outside mitochondria and 34 inside mitochondria.'

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Maximum energy becomes available per mole of glucose when it is metabolised through

  1. Glycolysis in skeletal muscle of a sprinter.

  2. Fermentation into ethanol by yeast.

  3. Fermentation into methanol by enteric bacteria.

  4. Aerobic respiration.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cells performing aerobic respiration synthesize much more ATP, but not as part of glycolysis. 

So the correct option is 'Aerobic respiration'.

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

In aerobic respiration one glucose produces

  1. $8 NADH + 2 FADH _2 + 2 ATP$
  2. $12 NADH + 2 FADH _2 + 38 ATP$
  3. $12 NADH + 30 ATP + H _2O$
  4. $10 NADH + 2 FADH _2 + 2 ATP + 2 GTP$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
| Process |  Site |  Energy Release | | --- | --- | --- | |  Glycolysis(breakdown of glucose into pyruvic acid) |  In cytoplasm |  2 ATP 2 NADH | | Decarboxylation(conversion of pyruvic acid into Acetyl co enzyme) | mitochondria |  2 ATP | |  Citric Acid Cycle(Oxidation of acetyl co enzyme)(when the cycle runs twice) | mitochondria |  8 NADH 2 FADH 2 GTP   | |  Total |   |  10+28=38 |
So the correct option is  $ 10NADH$+ $2 FADH _2$ +$2ATP$+ $2GTP$
Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Oxidation of one molecule of glucose in aerobic respiration produces

  1. 2 ATP

  2. 30 ATP

  3. 36 ATP

  4. 38 ATP
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
 Product  Molecule  ATP
 Glycolysis  2 ATP2NADH  8ATP
 Krebs cycle NADH  3 (in two cycle)  18 ATP
 FADH$ _2$  2 (in two cycle)  4 ATP
 GTP  2 (in two cycle)  2ATP
 Oxidative decarboxylation  2 NADH (in two cycle)  6ATP
 Total    38
Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Number of ATP molecules produced from 1 glucose molecule in aerobic respiration

  1. 38

  2. 32

  3. 30

  4. 28
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
 Product  Molecule  ATP
 Glycolysis  2 ATP2NADH  8ATP
 Krebs cycle NADH  3 (in two cycle)  18 ATP
 FADH$ _2$  4 (in two cycle)  4 ATP
 GTP  2 (in two cycle)  2ATP
 Oxidative decarboxylation  2 NADH (in two cycle)  6ATP
 Total    38