AQA Additional Enzymes Quiz

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  • 1/14 Questions

    Enzymes are made up of a complex chain of ......... ......... .

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AQA Additional Enzymes Quiz - Quiz
About This Quiz

This AQA Additional Enzymes Quiz tests your knowledge on enzymes, their properties, and biological roles. It covers enzyme types, functions, synthesis, and related biological processes.

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  • 2. 

    What type of molecule is an enzyme?

    • Carbohydrate

    • Protein

    • Fat

    • DNA

    • Protease

    Correct Answer
    A. Protein
    Explanation
    Enzymes are proteins that act as catalysts in biological reactions. They are made up of long chains of amino acids that fold into complex three-dimensional structures. These structures enable enzymes to bind to specific molecules, called substrates, and facilitate chemical reactions. Enzymes play crucial roles in various biological processes, including metabolism, digestion, and cellular signaling. Therefore, the correct answer is protein.

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  • 3. 

    The enzyme made by the salivary glands is what?

    • Starch

    • Lipase

    • Protease

    • Ligase

    • Amylase

    Correct Answer
    A. Amylase
    Explanation
    The enzyme made by the salivary glands is amylase. Amylase is responsible for breaking down starch into smaller molecules, such as maltose and glucose, which can be easily absorbed by the body. It is produced by the salivary glands and also the pancreas, and plays a crucial role in the digestion of carbohydrates in the mouth and small intestine.

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  • 4. 

    Where does the substrate fit into the enzyme?

    • Action Site

    • Substrate Site

    • Activation Site

    • Active Site

    • Action Area

    Correct Answer
    A. Active Site
    Explanation
    The active site is where the substrate fits into the enzyme. It is a specific region on the enzyme's surface that allows the substrate to bind and undergo a chemical reaction. The active site has a unique shape and chemical properties that are complementary to the substrate, allowing for a specific interaction and facilitating the conversion of the substrate into a product.

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  • 5. 

    What do ribosomes do?

    • Breakdown excess fatty acids

    • Protein Synthesis

    • Respiration

    • Photosynthesis

    • Digestion

    Correct Answer
    A. Protein Synthesis
    Explanation
    Ribosomes are responsible for protein synthesis. They are small structures found in the cytoplasm of cells and are involved in the process of translating genetic information from the DNA into proteins. Ribosomes read the messenger RNA (mRNA) and use it as a template to assemble amino acids in the correct order, forming a protein chain. This process is essential for the growth, development, and functioning of cells and organisms. Therefore, the correct answer is "Protein Synthesis."

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  • 6. 

    Enzymes speed up the rate of reactions by lowering what?

    • Action Energy

    • Temperatures

    • Activation Energy

    • Reaction Rates

    • Active Sites

    Correct Answer
    A. Activation Energy
    Explanation
    Enzymes speed up the rate of reactions by lowering the activation energy. Activation energy is the minimum amount of energy required for a chemical reaction to occur. By lowering the activation energy, enzymes make it easier for reactant molecules to reach the transition state and form products. This allows reactions to happen more quickly and efficiently.

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  • 7. 

    When do enzymes denature?

    • At low temperatures below 35 degrees.

    • At high temperatures above 40 degrees.

    • At temperatures above and below 37 degrees.

    • At 37 degrees

    • At freezing point

    Correct Answer
    A. At high temperatures above 40 degrees.
    Explanation
    Enzymes denature at high temperatures above 40 degrees because excessive heat disrupts the enzyme's structure and causes it to lose its shape. This loss of shape affects the enzyme's active site, preventing it from binding to its substrate and carrying out its catalytic function. As a result, the enzyme becomes inactive and cannot perform its intended role in biochemical reactions. Conversely, enzymes are generally more stable and active at temperatures closer to the physiological range, around 37 degrees Celsius.

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  • 8. 

    Where is bile made?

    • Liver

    • Lungs

    • Pancreas

    • Small Intestine

    • Stomach

    Correct Answer
    A. Liver
    Explanation
    The liver is responsible for producing bile. Bile is a greenish-yellow fluid that is essential for the digestion and absorption of fats. It is produced in the liver and stored in the gallbladder before being released into the small intestine. Bile helps to break down fats into smaller molecules, making them easier to absorb and utilize by the body. Additionally, bile also helps in the elimination of waste products from the liver. Therefore, the correct answer is the liver.

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  • 9. 

    What is the optimum pH of pepsin?

    • 5

    • 7

    • 2

    • 10

    • 8

    Correct Answer
    A. 2
    Explanation
    The optimum pH of pepsin is 2. Pepsin is an enzyme that functions in the stomach to break down proteins. It is most active and efficient at a low pH, specifically around 2. This acidic environment in the stomach helps to denature proteins and allows pepsin to effectively cleave peptide bonds. A pH of 2 is necessary for pepsin to maintain its structure and function optimally.

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  • 10. 

    Where is pepsin found?

    • Small Intestine

    • Pancreas

    • Liver

    • Mouth

    • Stomach

    Correct Answer
    A. Stomach
    Explanation
    Pepsin is an enzyme that aids in the digestion of proteins. It is produced and released by the cells lining the stomach walls. The stomach is the main site where pepsin is found, as it functions in the acidic environment of the stomach to break down proteins into smaller peptides. Therefore, the correct answer is Stomach.

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  • 11. 

    Which reactions are enzymes not directly involved in?

    • Respiration

    • Photosynthesis

    • Genetic Engineering

    • Digestion

    • Predation

    Correct Answer
    A. Predation
    Explanation
    Enzymes are not directly involved in predation because predation refers to the act of one organism consuming another for food, which is primarily a behavioral and ecological process. Enzymes, on the other hand, are biological molecules that catalyze chemical reactions within living organisms. While enzymes play crucial roles in processes like respiration, photosynthesis, genetic engineering, and digestion by facilitating the breakdown of molecules and the synthesis of new compounds, they do not directly participate in the predatory behavior of one organism hunting and consuming another.

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  • 12. 

    Which enzyme is involved in the production of slimming products?

    • Isomerase

    • Isotopase

    • Protease

    • Lipase

    • Carbohydrase

    Correct Answer
    A. Isomerase
    Explanation
    Isomerase is involved in the production of slimming products. Isomerase is an enzyme that catalyzes the conversion of one isomer to another. In the context of slimming products, isomerase can be used to convert certain compounds or molecules into a different isomer that may have slimming or weight loss properties. Therefore, isomerase plays a role in the production of slimming products.

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  • 13. 

    What is not a function of bile?

    • Neutralisation

    • Emulsification

    • Assists in fat digestion

    • Assists in protein digestion

    • Excretion

    Correct Answer
    A. Assists in protein digestion
    Explanation
    Bile is a substance produced by the liver and stored in the gallbladder, which aids in the digestion and absorption of fats. It plays a crucial role in emulsifying fats, breaking them down into smaller droplets to increase their surface area for better digestion. Bile also helps in the absorption of fat-soluble vitamins. However, bile does not directly assist in protein digestion. The main enzymes responsible for protein digestion are produced by the pancreas and stomach. Therefore, "Assists in protein digestion" is not a function of bile.

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  • 14. 

    Which enzyme is involved in Genetic Engineering?

    • Replication Enzymes

    • Restriction Enzymes

    • DNAase

    • RNAase

    • DNA Polymerase

    Correct Answer
    A. Restriction Enzymes
    Explanation
    Restriction enzymes are the correct answer because they are enzymes commonly used in genetic engineering. These enzymes are able to cut DNA at specific sequences, allowing scientists to manipulate and modify genes. By cutting DNA at specific points, restriction enzymes enable the insertion of new genes or the removal of unwanted genes. This process is essential in genetic engineering, as it allows scientists to create genetically modified organisms and study gene function.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 11, 2009
    Quiz Created by
    Hel77v

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