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Respiration in Plants · Question 38

AIPMT 2004MCQEasy📈 Topic in 38% papers+4−1
1

In glycolysis, during oxidation electrons are removed by

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

Answer

(3) NAD+

Solution

As per NCERT, in glycolysis 3-phosphoglyceraldehyde (PGAL) is oxidised and phosphorylated to 1,3-bisphosphoglyceric acid (BPGA).

⇒ In this step two redox-equivalents (electrons with H+) are removed from PGAL and transferred to NAD+.

NAD+ + 2e- + 2H+ NADH + H+

∵ Glycolysis is anaerobic, molecular oxygen is not the electron acceptor; glyceraldehyde-3-phosphate is the substrate that loses electrons.

∴ Electrons are removed by NAD+.

Answer: (3)

AIPMT 2004

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2

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
3

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
4

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

  1. 2
  2. 4
  3. 38
  4. 34
AIPMT 2002
5

Cytochrome is

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

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