Question

The conversion of pyruvate into acetyl CoA uses what enzyme?

		Pyruvate Hydrolase
		Pyruvate Carboxylase
		Lactate Dehydrogenase
		Citrate Synthase
		None of the above Jenny’s lungs have an intrapulmonic pressure of 762 mmHg and an intrapleural pressure of 757 mmHg. Atmospheric pressure is 759 mmHg. What is happening to Jenny? Jenny is inhaling Jenny’s ventilation is at a rest Jenny is exhaling Jenny is suffocating None of the above Which of the following enzymes does ubiquinone transport electrons to in the ETC?

Answer 1

Answer:

Answer 1. Option E; None of the above

Explanation: Pyruvate is the end product of the glycolysis reaction which is a chain of 10 reactions common in all types of respiration. The process takes place in the cytoplasm of the cell. However, the total energy released during glycolysis is only 2 ATP molecules.

When the decision to undergo the aerobic respiration is being taken by the cell, the pyruvic acid changes itself to a 2 carbon compound; Acetyl coA which has to enter the mitochondrial matrix so as to undergo finally the process of aerobic respiration. This process of conversion of pyruvic acid to acetyl coA takes place in the presence of an enzyme complex; Pyruvate dehydrogenase complex enzyme.

Answer 2. Option C; Jenny is exhaling

Explanation: Intrapulmonary pressure is the one which is developed inside the alveoli of the lungs. Per the given input the intra pulmonary pressure is 762 mm of Hg. Also, it is being reported that the intra pleuric pressure that is the pressure within the two coverings of the lungs is always found to be lower than that of the intra pulmonary pressure.

Given the atmospheric pressure is the 759 mm of Hg which is lower than the pressure within the lungs.

Since we know that breathing is due to the diffusion; which is the movement of gases from their higher to lower pressure; we conclude that Jenny must be exhaling as the pressure within the lungs is more compared to the atmospheric pressure. Hence gases from lungs are moving outwards to the atmosphere. This happens during exhalation.

Answer 3. The charged ubiquinone proteins are known to pass their electrons to cytochrome b and then from there to cytochrome c1-c.

All these are electron transport carrier proteins which are arranged according to their increasing reduction potentials. The electrons which were initially donated by the NADH moves to the FeS (Iron sulfur) protein complex and then from there to the quinine protein complex which is also called as the Ubiquinone.

Ultimately the electrons are transferred to the cytochrome a3 where in the presence of oxygen, the metabolic water is formed.