Enzymes act as biological catalysts by accelerating chemical reactions. Which is TRUE about enzyme-substrate interactions:

Question

BlackTom AI · Accepted Answer

Let’s break down each option to evaluate its accuracy about enzyme–substrate interactions.
Option 1: 'Substrates are released by the enzyme and then converted into products.' This is misleading because the enzymatic process typically involves the substrate binding to the active site, being converted into products within the enzyme–substrate complex, and then the products are released. The statement implies substrates are released before conversion, which contradicts the core mechanism of catalysis.
Option 2: 'Enzymes speed up the conversion of the substrate by decreasing the energy of activation of the reaction.' This aligns with fundamental enzyme kinetics: enzymes provide an alternative reaction pathway with a lower activation energy, enabling more substrate molecules to reach the transition state per unit time. The concept of lowering activation energy is central to how enzymes accelerate reactions.
Option 3: 'Most enzymes can catalyze the reaction of many kinds of substrates in a very short time.' This overstates enzyme specificity. In reality, enzymes are highly specific for their substrates (and often even for specific stereoisomers or chemical groups). They generally do not catalyze reactions of many different substrates with the same efficiency.
Option 4: 'Substrates form strong covalent bonds with the enzyme.' For most enzymatic mechanisms, substrates interact noncovalently with the active site, such as through hydrogen bonds, ionic interactions, or van der Waals forces. While some enzymes participate in covalent catalysis via transient covalent bonds, the phrase 'strong covalent bonds' universally describing substrate–enzyme interactions is inaccurate and overly broad.
In summary, the second statement correctly captures the essence of how enzymes function by lowering the activation energy, while the other options contain conceptual inaccuracies about substrate binding, specificity, and the nature of enzyme–substrate interactions.

Enzymes act as biological catalysts by accelerating chemical reactions. Which is TRUE about enzyme-substrate interactions:单项选择题

类似问题

Match the following terms about enzyme catalysis with their description: 1: Transition state 2: Binding energy 3: Active site 4: Activation energy 5: Gibbs free energy

Question at position 6 What is the role of enzymes in most biochemical reactions?To slow down the reactionTo change the type of reaction that occursTo stop the reactionTo speed up the reactionClear my selection

Which of the following statements about the impact of enzymes on chemical reactions is FALSE?

Enzymes speed up chemical reactions without being used up in the reaction.

What would be the result of an enzyme having a greater binding energy for the substrate than for the transition state?

What best describes the role of an enzyme in a reaction?

Which of the following statement is NOT correct about how enzymes catalyse a reaction?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单