Question

954.Uncouple proteins can dissipate the proton gradient (or cause leakage of protons) in the inner membrane of mitochondria and thus decrease the membrane potential. As a result, more ATP molecules are synthesized and electron transport is stimulated.True/False?

953.Muscle lacks glucose-6-phosphatase and therefore glucose-6-phosphate cannot be dephosphorylated in muscle for export into the blood. Muscle stores glycogen for its use and muscle glycogen serve as a source of readily available fuel particular during the period of muscle exertion or physical exercise.True/False?

952.Mammals have enzymes for the glyoxylate cycle in which acetate can be assimilated into 4-carbon intermediate in the TCA and thus enable the synthesis of glucose.True/False?

951.Both glycogen synthesis and glycogen breakdown both involve glucose-1-P.True/False?

950.Glucose can be synthesized from palmitic acid in mammals. True/False?

949.Gluconeogenesis occurs actively in the liver during periods of exercise or fasting.True/False?

Answer 1

954). False

In the presence of minute amounts of detergents that make the membrane leaky, the oxidation of these metabolites by O2 still occurs, but no ATP is made. Under these conditions, no transmembrane proton concentration gradient or membrane electric potential can be maintained.

953). True

Glycogen is the main energy substrate during exercise

952). False

The cycle only occurs in plants, bacteria, and yeast, as they are the only organisms containing the enzymes isocitrate lyase and malate synthase. Animals cannot run the glyoxylate cycle, they cannot make glucose from acetyl-CoA in net amounts, but plants, yeast, and bacteria can.

951). True

950). False

Fatty acids are broken down to acetyl-CoA by means of beta oxidation inside the mitochondria, whereas fatty acids are synthesized from acetyl-CoA outside the mitochondrion, in the cytosol. ... There can therefore be no net conversion of fatty acids into glucose.

949).False

Gluconeogenesis is the metabolic process by which organisms produce sugars (namely glucose) for catabolic reactions from non-carbohydrate precursors. Glucose is the only energy source used by the brain (with the exception of ketone bodies during times of fasting), testes, erythrocytes, and kidney medulla

Although most gluconeogenesis occurs in the liver, the relative contribution of gluconeogenesis by the kidney is increased in diabetes and prolonged fasting.