Respiration in Plants — Practice

Question 1

Where does glycolysis occur and what are its products?

Accepted Answer

Glycolysis occurs in the cytoplasm. From one glucose it produces 2 molecules of pyruvate, a net 2 ATP, 2 NADH, and 2 molecules of water.

Question 2

What is the role of oxygen in aerobic respiration?

Accepted Answer

Oxygen is the final electron acceptor at the end of the electron transport system. It combines with electrons and protons to form water. Without oxygen the ETS, and hence oxidative phosphorylation, would stop.

Question 3

How many ATP molecules are produced from one glucose molecule in aerobic respiration?

Accepted Answer

About 36-38 ATP: roughly 7 from glycolysis (2 net substrate-level + 5 from 2 NADH), 5 from the link reaction (2 NADH), and the rest from the Krebs cycle (2 ATP + 6 NADH + 2 FADH2 via the ETS). The exact figure depends on the shuttle system used.

Question 4

What are the end products of alcoholic and lactic acid fermentation?

Accepted Answer

Alcoholic fermentation (yeast) produces ethanol, CO2, and 2 ATP per glucose. Lactic acid fermentation (some bacteria and animal muscle) produces lactic acid and 2 ATP per glucose.

Question 5

Calculate the RQ for respiration of tripalmitin: 2 C51H104O6 + 145 O2 -> 102 CO2 + 104 H2O.

Accepted Answer

RQ = CO2 released / O2 consumed = 102/145 = 0.70, which is typical for the respiration of fats.

Practice — Respiration in Plants

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