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Chapter 14: Problem 54

The concentrations of enzymes in cells are usually quite small. What is the biological significance of this fact?

Short Answer

Expert verified
Low enzyme concentrations allow for efficiency, energy conservation, precise regulation, and reduced cellular crowding.

Step by step solution

01

Understanding Enzyme Efficiency

Enzymes are highly efficient catalysts that can significantly speed up chemical reactions, even at low concentrations. This means that only a small amount of enzyme is required to process many substrate molecules, making it beneficial for cells to maintain low concentrations of enzymes.
02

Energy Conservation

Synthesizing enzymes is an energy-intensive process for cells, so having low concentrations helps to conserve energy. Cells can allocate energy resources more efficiently by producing only the amount of enzyme required to meet metabolic needs.
03

Regulation of Cellular Activities

Low concentrations of enzymes allow for precise regulatory control. Cells can rapidly adjust metabolic pathways by modifying enzyme activity through inhibition or activation, without the need for large quantities.
04

Minimizing Cellular Crowding

Maintaining low enzyme concentrations helps prevent overcrowding within the cell, allowing for optimal movement of molecules and efficient cellular function. This is crucial for maintaining homeostasis and effective intercellular communications.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Enzyme Efficiency
Enzymes are remarkable biological catalysts that play a crucial role in speeding up chemical reactions within the cell. Their high efficiency means that even a minute amount can catalyze a large number of substrate molecules, significantly accelerating biochemical processes. But why is this important? By maintaining low enzyme concentrations, cells can achieve the desired reaction rates without overproduction, which ensures that only the necessary number of enzymes is synthesized and utilized. This efficiency in catalysis means less is more when it comes to enzyme quantity, allowing the cell to function optimally without unnecessary accumulation of enzymes.
Energy Conservation in Cells
In cells, it's vital to manage energy resources wisely. Producing enzymes is energy-consuming since they are complex proteins that require several steps in synthesis. By maintaining low enzyme concentrations, cells conserve energy, sparing resources for other critical functions. This conservation strategy allows cells to be economical, producing only the necessary enzymes to meet metabolic demands. This way, cells avoid wasting energy on producing excess enzymes that aren鈥檛 immediately needed, optimizing the overall energy expenditure.
Regulation of Cellular Activities
The regulation of cellular activities relies heavily on enzymes. Since enzymes can be finely controlled through various mechanisms, such as inhibition or activation, their low concentrations lend themselves well to precise control. Low enzyme levels enable the cell to swiftly change metabolic pathways in response to environmental or internal signals. Cells can fine-tune enzyme activity by adding or removing regulatory molecules, thus avoiding overactive pathways that could lead to imbalance. This precision in regulation ensures that the cell maintains metabolic balance and responds efficiently to changes.
Cellular Crowding
Cellular crowding can impede proper cellular function by restricting the movement of molecules, thus slowing down reaction rates and interfering with efficient cellular operations. Low concentrations of enzymes contribute to reducing this crowding. By maintaining a sleek profile of enzymes, cells ensure that there is ample space for necessary interactions and molecule movements. This reduction in crowding facilitates better homeostasis, ensuring that essential biochemical processes proceed smoothly, and helps in maintaining efficient cellular communication and transport pathways.

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Most popular questions from this chapter

The reaction \(\mathrm{S}_{2} \mathrm{O}_{8}^{2-}+2 \mathrm{I}^{-} \longrightarrow 2 \mathrm{SO}_{4}^{2-}+\mathrm{I}_{2}\) pro- ceeds slowly in aqueous solution, but it can be catalyzed by the \(\mathrm{Fe}^{3+}\) ion. Given that \(\mathrm{Fe}^{3+}\) can oxidize \(\mathrm{I}^{-}\) and \(\mathrm{Fe}^{2+}\) can reduce \(\mathrm{S}_{2} \mathrm{O}_{8}^{2-},\) write a plausible twostep mechanism for this reaction. Explain why the uncatalyzed reaction is slow.

When a mixture of methane and bromine is exposed to light, the following reaction occurs slowly: $$ \mathrm{CH}_{4}(g)+\mathrm{Br}_{2}(g) \longrightarrow \mathrm{CH}_{3} \mathrm{Br}(g)+\mathrm{HBr}(g) $$ Suggest a reasonable mechanism for this reaction. (Hint: Bromine vapor is deep red; methane is colorless.)

Consider this elementary step: $$ X+2 Y \longrightarrow X Y_{2} $$ (a) Write a rate law for this reaction. (b) If the initial rate of formation of \(\mathrm{XY}_{2}\) is \(3.8 \times 10^{-3} \mathrm{M} / \mathrm{s}\) and the initial concentrations of \(X\) and \(Y\) are \(0.26 M\) and \(0.88 M\) what is the rate constant of the reaction?

Consider this mechanism for the enzyme-catalyzed reaction $$ \mathrm{E}+\mathrm{S} \underset{k_{-1}}{\stackrel{k_{1}}{\leftrightarrows}} \mathrm{ES} \quad \text { (fast equilibrium) } $$ $$ \mathrm{ES} \stackrel{k_{2}}{\longrightarrow} \mathrm{E}+\mathrm{P} \quad(\text { slow }) $$ Derive an expression for the rate law of the reaction in terms of the concentrations of \(\mathrm{E}\) and \(\mathrm{S}\). ( Hint: To solve for [ES], make use of the fact that, at equilibrium, the rate of the forward reaction is equal to the rate of the reverse reaction.)

The rate law for the reaction \(2 \mathrm{NO}_{2}(\mathrm{~g}) \longrightarrow \mathrm{N}_{2} \mathrm{O}_{4}(g)\) is rate \(=k\left[\mathrm{NO}_{2}\right]^{2}\). Which of these changes will change the value of \(k ?\) (a) The pressure of \(\mathrm{NO}_{2}\) is doubled. (b) The reaction is run in an organic solvent. (c) The volume of the container is doubled. (d) The temperature is decreased. (e) A catalyst is added to the container.
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