Chemical Reactions And Enzymes
Questions and Answers
- 1.
The element or compounds that that enter into a chemical reaction are...
- A.
Reactant
- B.
Product
- C.
Substrate
Correct Answer
A. ReactantExplanation
Reactants are the elements or compounds that undergo a chemical reaction. They are the starting materials that are present before the reaction takes place. Reactants are transformed into products, which are the end result of the chemical reaction. Substrates, on the other hand, are specific reactants in enzyme-catalyzed reactions. Therefore, reactant is the correct answer as it refers to the substances that participate in a chemical reaction.Rate this question:
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- 2.
Chemical reactions are important to help the body maintain ___________
- A.
Energy changes
- B.
Homeostasis
- C.
Respiration
Correct Answer
B. HomeostasisExplanation
Chemical reactions are important to help the body maintain homeostasis. Homeostasis refers to the body's ability to maintain a stable internal environment despite external changes. Chemical reactions play a crucial role in regulating various physiological processes, such as metabolism, pH balance, and temperature control. These reactions help to break down nutrients, produce energy, eliminate waste products, and synthesize essential molecules. By maintaining homeostasis, the body ensures that its cells and organs function optimally, promoting overall health and well-being.Rate this question:
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- 3.
The reactants of enzyme-catalysed reactions are called
- A.
Substrates
- B.
Natural catalysts
- C.
Enzymes
Correct Answer
A. SubstratesExplanation
In enzyme-catalysed reactions, the reactants are referred to as substrates. Substrates are the molecules that bind to the active site of an enzyme and undergo a chemical reaction to form products. Enzymes act as catalysts by increasing the rate of these reactions without being consumed in the process. While enzymes are involved in the reaction, they are not the reactants themselves. Therefore, the correct answer is substrates.Rate this question:
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- 4.
Substrates bind to _______ enzymes
- A.
Specific
- B.
Big
- C.
Small
Correct Answer
A. SpecificExplanation
Enzymes are highly specific in nature, meaning they can only bind to certain substrates that have a complementary shape and chemical properties. This specificity allows enzymes to catalyze specific chemical reactions in the body. Therefore, the correct answer is "specific" as substrates bind to specific enzymes that can facilitate their conversion into products.Rate this question:
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- 5.
EXAMPLE:a chemical reaction in your body that is important is when it enables your bloodstream to remove __________ from your body.
- A.
Carbon dioxide
- B.
Carbon monoxide
- C.
Chocolate
Correct Answer
A. Carbon dioxideExplanation
One of the important chemical reactions in the body is when it enables the bloodstream to remove carbon dioxide. Carbon dioxide is a waste product produced by cells during metabolism, and it needs to be eliminated from the body to maintain proper pH balance. The respiratory system plays a crucial role in this process by exchanging oxygen for carbon dioxide in the lungs, which is then exhaled. This helps to prevent the buildup of carbon dioxide in the body, which can lead to respiratory acidosis and other health issues.Rate this question:
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- 6.
When chemical bonds are formed or broken during chemical reactions, energy is _______ or __________.
- A.
Created or dissolved
- B.
Released or absorbed
- C.
Reversed or effected
Correct Answer
B. Released or absorbedExplanation
During chemical reactions, energy is either released or absorbed. When chemical bonds are formed, energy is released as the bonds are stabilized, resulting in a release of energy. On the other hand, when chemical bonds are broken, energy is absorbed from the surroundings to break the bonds, resulting in an absorption of energy. Therefore, the correct answer is released or absorbed.Rate this question:
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- 7.
Chemical reactions that absorb energy often occur spontaneously
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Chemical reactions that absorb energy do not occur spontaneously. In fact, these reactions require an input of energy in order to proceed. This is because the reactants have a higher energy level than the products, and energy needs to be added to the system to overcome this energy barrier. Once the energy is added, the reaction can occur and the products are formed. Therefore, the correct answer is false.Rate this question:
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- 8.
Every organism must have a source of energy to carry out the chemical reactions it needs to stay alive.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is true because all living organisms require energy to perform essential functions such as growth, reproduction, and metabolism. Energy is needed to carry out chemical reactions within cells, such as breaking down food molecules to release energy. Without a source of energy, organisms would not be able to survive. Therefore, it is necessary for every organism to have a source of energy to stay alive.Rate this question:
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- 9.
This is all true about Enzymes:Enzymes:-proteins-biological catalysts-slow down chemical reactions that take place in cells-lowers activation energy
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Enzymes are actually biological catalysts that speed up chemical reactions in cells rather than slowing them down. They are proteins that lower the activation energy required for a reaction to occur, making it easier for the reaction to take place. Therefore, the statement "Enzymes slow down chemical reactions that take place in cells" is incorrect.Rate this question:
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- 10.
A catalyst ______ the rate of reaction and _______ the activation energy
Correct Answer
speeds up and lowersExplanation
A catalyst is a substance that speeds up the rate of a chemical reaction without being consumed in the process. It achieves this by providing an alternative pathway with a lower activation energy for the reaction to occur. By lowering the activation energy, the catalyst makes it easier for the reactant molecules to overcome the energy barrier and react, thus increasing the rate of the reaction. Therefore, the given answer "speeds up and lowers" accurately describes the effect of a catalyst on the rate of reaction and activation energy.Rate this question:
- 11.
Reactants collide with _______ so bonds will be broken and new bonds will form.
Correct Answer
energyExplanation
Reactants collide with energy in order to overcome the activation energy barrier and break the existing bonds. This allows the atoms or molecules to rearrange and form new bonds, resulting in the formation of products. The energy provided by the collision helps to destabilize the reactant molecules and initiate the chemical reaction.Rate this question:
- 12.
How does temperature effect enzyme activity?
- 13.
Substrates and enzymes are like the analogy of a lock and key. They are unlocking...
- A.
The enzyme
- B.
A bond
- C.
A lock
Correct Answer
B. A bondExplanation
Substrates and enzymes can be compared to a lock and key because just like a key is needed to unlock a lock, a substrate is needed to activate an enzyme. In this analogy, the bond represents the lock, and the substrate represents the key that fits perfectly into the lock (enzyme), allowing the bond to be broken or formed. This interaction between the substrate and enzyme is crucial for the enzyme to catalyze a specific reaction.Rate this question:
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