Which correctly states the order of the stages of aerobic respiration? I. glycolysis II. electron transport chain III. citric

10 answers
Question:

Which correctly states the order of the stages of aerobic respiration?
I. glycolysis
II. electron transport chain
III. citric acid cycle
A. I, II, III
B. II, I , III
C. III, I, II
D. I, III, II

Answers

answer:

A

Explanation:

i don't really know how to explain it

a

Explanation:

1.The correct answer is: It is produced in glycolysis and consumed in the citric acid cycle

Pyruvate is a molecule that connects metabolic processes of cellular respiration: glycolysis and Krebs (citric acid) cycle. Glycolysis is a process that occurs in the cytosol of the cell and in which several of enzymes catalyze the breakdown of glucose molecules. At the end of glycolysis, products are two pyruvate molecules and released energy (ATP).

After this step, in the matrix of mitochondria oxidation of pyruvate occurs. During this reaction, pyruvate is converted into a three-carbon molecule—acetyl CoA. Acetyl then acts as fuel for the citric acid cycle.

2.The correct answer is: electron transport chain

The amount of ATP produced per glucose is:

Glycolysis: 2 ATP

A process in which glucose is converted into two molecules of pyruvate, ATP is made, NAD+ is converted into NADH.

Krebs Cycle (citric acid cycle): 2 ATP

The acetyl CoA (made from pyruvate) goes through a cycle of reactions. ATP, NADH, FADH2 and CO2 is released.

Electron Transport Chain (oxidative phosphorylation): 28 ATP

Electrons from NADH and FADH2 move down the electron transport chain, protons are pumped out of the matrix, forming a gradient. Gradient of proton is used for the ATP synthesis.

Fermentation: 2 ATP

Breaking down carbohydrates (usually glucose) in the absence of oxygen.

34 ATP molecules

Explanation:

Aerobic respiration consists of 3 parts:

1. Glycolysis - you make 2 ATP in this stage

2. Krebs Cycle (also called TCA Cycle) - you make 0 ATP in this stage (but lots of really important intermediates!)

3. Oxidative Phosphorylation - this stage uses the electron transport chain and you make a LOT of ATP in this stage.

So...your answer is Oxidative Phosphorylation!

d

Explanation:

t should be D

Fatty acids cannot be used by some vital tissues in the human body, such as the brain.

Beta-oxidation—where fatty acids are broken down—requires a great deal of ATP and is not an energy-efficient process for cells.

Explanation:

Fatty acids are the products of fats in the body. They are known to provide about six times the amount of energy generated by carbohydrates. But some vital organs of the body such as the brain doesn't make use of fatty acids for their energy production. The primary function of fatty acids is not catabolism but protein synthesis. The brain doesn't have energy stores and requires constant supply of energy, this makes it rely mostly on glucose which can provide quick energy for it use. This is also because a major product of fatty acid degradation, superoxide is  injurious to brain cells and many other cells of the body. The beta-oxidation of fatty acids also require great deal of ATP and such process does not conserve energy. Since the brain requires constant supply of energy and with little work, it solely depends on glucose for the production of energy. Only in prolonged starvation does it initiate the use of fatty acids and even proteins.

The Kerb’s/ Citric Acid/tricarboxylic acid (TCA) Cycle of aerobic respiration produces FADH and NADH and releases CO2

Explanation:

The Kerb’s Cycle is termed as the cell’s biochemical hub because its main function is to harvest high-energy electrons from carbon fuels.

It is constituted by a series of eight steps of chemical and enzymatic reactions including redox, condensation, hydration, dehydration, decarboxylation etc.

One complete Kerb’s Cycle produces 2 carbon dioxide, 1 GTP, 3 NADH, and 1FADH2 molecules. Each glucose molecule yields two acetyl-CoA molecules and hence each glucose molecule requires two Kerb’s cycle.

Energy and carbon dioxide and water

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