The most important metabolic fuel molecule in the body?

Question

(a) protein
(b) vitamins
(c) sucrose
(d) glucose

Answer 1

D.Glucose.This is the compound that is metabolised rapidly to yield energy.Proteins can be broken down and then converted to metabolic intermediates of the Krebs cycle,but the first source is always glucose.

Answer 2

D. Glucose is the energy storage molecule and is widely used for catabolism.

Answer 3

Glucose....that and glycogen are the only sources of energy for the brain and red blood cells (and glycogen gets broken down into glucose, so there you have it)

Answer 4

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Another major fuel used as a source of bond energy for the synthesis of ATP is fat - specifically fatty acids. These may be oxidised immediately following absorption from the gut or stored as triglycerides and used later. Fatty acids are an important metabolic fuel particularly for muscle tissue. They are used by all tissues (except the brain) under normal dietary circumstances and are used exclusively by some tissues under altered dietary conditions such as starvation. --------------------------------------... Storage and mobilisation of fatty acids Dietary fat (which is digested and then re-synthesised into triglycerides) is non-polar and must be carried in the circulation as lipoproteins. The protein molecules provide a polar coat for the non-polar lipid and thus enable transportation in the polar (water based) bloodstream. The lipoproteins which transport triglycerides derived from the diet to adipose tissue are called chylomicrons. Storage in the adipose tissue is catalysed by lipoprotein lipase, the activity of which is stimulated by insulin (the same hormone which stimulates storage of glucose as glycogen). --------------------------------------... Hormonal control of storage and mobilisation When required, the stored triglycerides are released from the adipose tissue, a process catalysed by mobilising lipase which is stimulated by adrenaline and glucagon, the same hormones which stimulate release of stored glycogen as glucose. When released from the adipose tissue, the fatty acids are transported attached to the major protein in the circulation, which is albumin. Fatty acids are transported to various tissues by this means and then oxidised. Triglyceride makes up about 70% of the body's energy reserve for two reasons : because they are non-polar, they are stored in the absence of water (termed anhydrous) Because of the absence of water, they are compact and light and a relatively large amount of triglyceride is stored in a relatively small space compared to glycogen. because of the structure of triglycerides being largely a hydrocarbon chain (16-20 covalently linked methyl groups), they are highly reduced. Because they are highly reduced, there is a large energy yield when they are oxidised. The relative energy yield from fat and carbohydrate is : approximately 40 kJ/g triglyceride approximately 18 kJ/g glycogen --------------------------------------... ß-oxidation of fatty acids This is a cyclic series of reactions (occurring within the mitochondria) with the end result of two carbon units being hydrolysed from the fatty acid chain with each cycle. These two carbon units are molecules of acetyl CoA. With each oxidation cycle, a molecule of NAD is reduced to NADH and one FAD is reduced to FADH. These are re-oxidised by the electron transport chain with the energy released coupled to ATP synthesis. The acetyl CoA molecules formed in each cycle are oxidised to CO2 in the citric acid cycle, with the oxidation/reduction reactions coupled to the electron transport chain and further ATP synthesis.

Answer 5

d. glucose