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Respiration in Plants · Question 37

AIPMT 2005MCQEasy📈 Topic in 0% papers+4−1
1

During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?

  1. Glycolysis
  2. Krebs' cycle
  3. Conversion of pyruvic acid to acetyl CoA
  4. Electron transport chain

Answer

(4) Electron transport chain

Solution

ATP yield from one glucose molecule (aerobic respiration):

Glycolysis: net 2 ATP (substrate level)

Pyruvic acid → acetyl CoA: no ATP directly (only NADH)

Krebs' cycle: 2 ATP (GTP) directly

Electron transport chain: oxidation of 10 NADH and 2 FADH2 gives about 34 ATP by oxidative phosphorylation

⇒ Total = 2 + 2 + 34 = 38 ATP

∴ The greatest number of ATP molecules is formed in the electron transport chain.

Answer: (4)

AIPMT 2005

Keep practising — Respiration in Plants

2

In glycolysis, during oxidation electrons are removed by

  1. ATP
  2. glyceraldehyde-3-phosphate
  3. NAD+
  4. molecular oxygen.
AIPMT 2004
3

In alcohol fermentation

  1. triose phosphate is the electron donor while acetaldehyde is the electron acceptor
  2. triose phosphate is the electron donor while pyruvic acid is the electron acceptor
  3. there is no electron donor
  4. oxygen is the electron acceptor.
AIPMT 2003
4

In which one of the following do the two names refer to one and same thing?

  1. Krebs' cycle and Calvin cycle
  2. Tricarboxylic acid cycle and citric acid cycle
  3. Citric acid cycle and Calvin cycle
  4. Tricarboxylic acid cycle and urea cycle
AIPMT 2003
5

How many ATP molecules are produced by aerobic oxidation of one molecule of glucose?

  1. 2
  2. 4
  3. 38
  4. 34
AIPMT 2002
6

Cytochrome is

  1. metallo flavo protein
  2. Fe containing porphyrin pigment
  3. glycoprotein
  4. lipid.
AIPMT 2001

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