Tag: carbohydrate metabolism
Questions Related to carbohydrate metabolism
Dark reaction is a
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Anabolic
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Catabolic
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Both A and B
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None of the above
The anabolic processes are the reactions in which the smaller organic molecules are used for the production of the large complex molecules. The carbon dioxide molecule is fixed in the dark reactions for the formation of the glucose molecule. Six molecules of CO$ _2$ are fixed to form one molecule of glucose in which the energy is stored.
What are biochemical reactions in the body known as?
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Anabolic reactions
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Metabolic reactions
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Catabolic reactions
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Vital reactions
Which reactions usually release energy that is used to drive chemical reactions.
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Anabolic
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Catabolic
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Photosynthesis
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None of the above
Metabolism refers to series of reactions wherein product of one reaction becomes reactant for the next one. It includes catabolism (degradative pathways) and anabolism (synthetic pathways). Catabolic reactions are the reactions in which complex molecules are broken down into smaller simpler molecules. The catabolic reactions are exergonic reactions( energy releasing reactions). While photosynthesis is an anabolic reaction which requires energy for the formation of complex molecules. Hence option B is the correct answer.
The term metabolism indicates a variety reactions carried out at
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atomic level
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molecular level
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cellular level
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tissue level
The metabolism is a chemical processes that occur within a living organism in order to maintain life and basic unit of life is cell, hence all metabolic reactions occur in cell. So, the correct option is 'Cellular level'
The enzymes ribulose biphosphate carboxylase-oxygenase and phosphoenol pyruvate carboxylase are activated by
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Mg
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Zn
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Mo
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Mn
Both RUBISCO and PEP carboxylase are important enzymes of dark reaction of photosynthesis. RUBISCO catalyzes carboxylation in C3 plants. In the presence of magnesium activated RUBISCO, carbon dioxide combines with ribulose bis phosphate to form phosphoglyceric acid. In C4 plants, mesophyll cells fix carbon dioxide with the help of phospho enol pyruvate in the presence of magnesium activated phospho-enol pyruvate carboxylase.
Haemoglobin is composed of four subunits. When one subunit binds to oxygen, it increases the chances that the other three subunits will also bind to oxygen. What is this type of activity called?
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Inhibition
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Cooperativity
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Enzyme substrate complex
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Catalysis
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Activation
Cyanide causes irreversible inhibition of cytochrome oxidase. This is because it
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Combines with iron.
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Destroys tertiary structure.
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Attaches to copper.
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All the above.
Which statement regarding enzyme inhibition is correct?
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Competitive inhibition occurs when a substrate competes with enzyme for binding to inhibitor protein
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Competitive inhibition occurs when the substrate and the inhibitor compete for active site on the enzyme
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Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
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Non-competitive inhibitors often bind to the enzyme irreversibly
An enzyme brings about
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Decrease in reaction time
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Increase in reaction time
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Increase in activation energy
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Reduction in activation energy
Enzymes are proteins which accelerate the rate of the reaction. The substrate and product have different energy state. The energy gap between the substrate and the product is known as activation energy which is the minimum energy required to initiate a reaction. The enzymes lower the activation energy and lead to the faster conversion of substrate to the product.
Nerve gas (DFP) inhibits neurotransmission as it reacts with
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Serine of acetylcholine-esterase.
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Choline of acetylcholine-esterase.
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Acetylcholine.
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Noradrenaline.