The process of breakdown of glucose to pyruvate is called: MCQ with Answer and Explanation

The process of breakdown of glucose to pyruvate is called:
A. Fermentation
B. Electron transport chain
C. Glycolysis
D. Krebs cycle
Answer: Option C
Solution (By JKSSB Mock Tests)
Glycolysis is a cytoplasmic pathway that converts glucose into two pyruvate molecules, producing a net of 2 ATP and 2 NADH. Krebs cycle and ETC are in mitochondria.

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Practice More Biology Questions

Question #1
Consider statements about evolution: 1. The theory of use and disuse was given by Lamarck. 2. The theory of natural selection was given by Darwin. 3. The theory of mutation was given by Hugo de Vries. Which are correct?
A. 2 and 3 only
B. 1 and 2 only
C. 1, 2 and 3
D. 1 and 3 only

Correct Answer: Option C


Explanation:
Jean-Baptiste Lamarck proposed the theory of inheritance of acquired characters, based on the use and disuse of organs. Charles Darwin proposed the theory of evolution by natural selection, emphasizing survival of the fittest. Hugo de Vries, a Dutch botanist, proposed the mutation theory of evolution after working on evening primrose, stating that evolution occurs via sudden, large mutations (saltations). All statements are correct.

This question belongs to: Science Biology
Question #2
Which of the following is a macronutrient for plants?
A. Iron
B. Zinc
C. Copper
D. Phosphorus

Correct Answer: Option D


Explanation:
Phosphorus is a primary macronutrient (along with nitrogen and potassium) required in relatively large amounts for nucleic acids, ATP, and phospholipids. Iron, zinc, and copper are micronutrients needed in trace amounts. Macronutrients include C, H, O, N, P, K, Ca, Mg, S. Micronutrients function as enzyme cofactors.

This question belongs to: Science Biology
Question #3
The actual site of gas exchange in the mammalian respiratory system is:
A. Bronchi
B. Trachea
C. Alveoli
D. Larynx

Correct Answer: Option C


Explanation:
The alveoli are the terminal, microscopic, thin-walled, highly vascularized air sacs in the lungs. They are the primary and actual sites of gas exchange, where oxygen diffuses from the inhaled air into the blood, and carbon dioxide diffuses from the blood into the alveolar air to be exhaled. Their large surface area and thin walls facilitate this diffusion.

This question belongs to: Science Biology