The Challenging Biology Quiz 2

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| By Dennis.tran
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Dennis.tran
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Quizzes Created: 1 | Total Attempts: 760
Questions: 21 | Attempts: 760

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The Challenging Biology Quiz 2 - Quiz

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Questions and Answers
  • 1. 

    A Carbohydrate consists of

    • A.

      Amino acid units

    • B.

      One or more sugar units

    • C.

      Lipid droplets

    • D.

      Glycerol

    Correct Answer
    B. One or more sugar units
    Explanation
    Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen atoms. They are classified as sugars, starches, and fibers. The correct answer, "one or more sugar units," accurately describes the composition of carbohydrates. Carbohydrates can be simple sugars (monosaccharides) or complex sugars (disaccharides and polysaccharides) made up of multiple sugar units. These sugar units are linked together by glycosidic bonds, forming the structure of carbohydrates. Therefore, the correct answer reflects the fundamental building blocks of carbohydrates.

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  • 2. 

    A Protein is made up of

    • A.

      Amino acid units

    • B.

      One or more sugar units

    • C.

      Lipid droplets

    • D.

      Biruret solution

    Correct Answer
    A. Amino acid units
    Explanation
    A protein is made up of amino acid units. Proteins are large, complex molecules that play essential roles in the body. They are made up of chains of amino acids, which are organic compounds containing an amino group (-NH2) and a carboxyl group (-COOH). These amino acid units are linked together by peptide bonds to form a polypeptide chain, which then folds into a three-dimensional structure to create a functional protein. The specific sequence and arrangement of amino acids determine the protein's unique structure and function.

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  • 3. 

    Benedict's solution is commonly used to test for

    • A.

      Proteins

    • B.

      Simple sugars

    • C.

      Nucleic acids

    • D.

      Lipids

    Correct Answer
    B. Simple sugars
    Explanation
    Benedict's solution is commonly used to test for simple sugars. Benedict's solution contains copper ions that react with reducing sugars, such as glucose and fructose, in a redox reaction. This reaction results in the formation of a brick-red precipitate, indicating the presence of simple sugars. Other biomolecules like proteins, nucleic acids, and lipids do not react with Benedict's solution and therefore cannot be tested using this method.

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  • 4. 

    Glycogen is

    • A.

      A polysaccharide

    • B.

      A storage carbohydrate

    • C.

      Found in human tissues

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Glycogen is a polysaccharide, which means it is a complex carbohydrate made up of many sugar molecules bonded together. It serves as a storage carbohydrate in human tissues, particularly in the liver and muscles. Therefore, the correct answer is "all of the above" because glycogen is indeed a polysaccharide and a storage carbohydrate found in human tissues.

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  • 5. 

    To test for starch, one would use

    • A.

      Benedict's solution

    • B.

      Uncoated paper

    • C.

      Sudan IV

    • D.

      Lugol's iodine solution

    Correct Answer
    D. Lugol's iodine solution
    Explanation
    Lugol's iodine solution is used to test for the presence of starch. When Lugol's iodine solution is added to a substance that contains starch, it turns from a yellowish-brown color to a dark blue or black color. This reaction occurs because iodine molecules interact with the starch molecules, forming a complex that has a different color. Therefore, using Lugol's iodine solution is an effective way to determine if a substance contains starch or not.

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  • 6. 

    Rich sources of stored energy that are dissolvable in organic solvents are

    • A.

      Carbohydrates

    • B.

      Proteins

    • C.

      Glucose

    • D.

      Lipids

    Correct Answer
    D. Lipids
    Explanation
    Lipids are a rich source of stored energy that can be dissolved in organic solvents. They are hydrophobic molecules that can be broken down to release energy when needed. Lipids, such as fats and oils, contain more than twice the amount of energy per gram compared to carbohydrates and proteins. This makes lipids an efficient form of stored energy in the body and also explains why they are commonly used as a fuel source during prolonged exercise or fasting.

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  • 7. 

    Polysaccharides consist of

    • A.

      Monosaccharaides linked in chains

    • B.

      Amino acid units

    • C.

      Glyceride unites

    • D.

      Condensed fatty acids

    Correct Answer
    A. Monosaccharaides linked in chains
    Explanation
    Polysaccharides are complex carbohydrates made up of multiple monosaccharide units linked together in chains. Monosaccharides are simple sugars, such as glucose and fructose. These monosaccharide units can be joined through glycosidic bonds to form long chains, which make up polysaccharides. Examples of polysaccharides include starch, cellulose, and glycogen. Therefore, the correct answer is "monosaccharaides linked in chains."

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  • 8. 

    Biuret reagent will indicate the presence of

    • A.

      Peptide ponds

    • B.

      Proteins

    • C.

      Amino acids units linked together

    • D.

      All of the above

    Correct Answer
    D. All of the above
    Explanation
    Biuret reagent is a chemical solution used to test for the presence of proteins. It reacts with peptide bonds, which are the bonds that link amino acid units together to form proteins. Therefore, when Biuret reagent is added to a sample, it will indicate the presence of peptide bonds, proteins, and amino acid units linked together. Hence, the correct answer is "all of the above".

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  • 9. 

    Let's Suppose you are worried that you've developed diabetes, a condition in which blood glucose levels rise and glucose accumulates in the urine. Recalling what you learned in class, what could you do to determine you have diabetes? 

    • A.

      Collect some urine, find some Sudan IV and perform a Sudan IV. As in class, a reddish-orange precipitate would indicate the presence of high urine glucose

    • B.

      Collect some urine, find some Biuret Reagent Test and perform a Biuret Reagent Test. As in class, a reddish-orange precipitate would indicate the presence of high urine glucose

    • C.

      Collect some urine, find some iodine solution Test and perform a iodine solution Test. As in class, a reddish-orange precipitate would indicate the presence of high urine glucose

    • D.

      Collect some urine, find some benedict's solution and perform a benedict's test. As in class, a reddish-orange precipitate would indicate the presence of high urine glucose

    Correct Answer
    D. Collect some urine, find some benedict's solution and perform a benedict's test. As in class, a reddish-orange precipitate would indicate the presence of high urine glucose
  • 10. 

    How do you verify that a soft-drink can contain diet soda rather than soda sweetened with fructose>

    • A.

      Test the two liquids with a Sudan IV test. Soda sweetened with fructose will test positive (for a reddish-brown precipitate), while diet soda will give a negative test and the benedict's solution will remain blue in color

    • B.

      Test the two liquids with a benedict's test. Soda sweetened with fructose will test positive (for a reddish-brown precipitate), while diet soda will give a negative test and the benedict's solution will remain blue in color

    • C.

      Test the two liquids with a Lugol's test. Soda sweetened with fructose will test positive (for a reddish-brown precipitate), while diet soda will give a negative test and the benedict's solution will remain blue in color

    • D.

      Test the two liquids with a Biuret regent's test. Soda sweetened with fructose will test positive (for a reddish-brown precipitate), while diet soda will give a negative test and the benedict's solution will remain blue in color

    Correct Answer
    B. Test the two liquids with a benedict's test. Soda sweetened with fructose will test positive (for a reddish-brown precipitate), while diet soda will give a negative test and the benedict's solution will remain blue in color
    Explanation
    The benedict's test is used to detect the presence of reducing sugars, such as fructose, in a solution. When a reducing sugar is present, it reacts with the benedict's reagent and forms a reddish-brown precipitate. In this case, if the soda is sweetened with fructose, it will test positive for the presence of reducing sugars. On the other hand, diet soda, which is typically sweetened with artificial sweeteners that are not reducing sugars, will give a negative test result and the benedict's solution will remain blue in color. Therefore, by using the benedict's test, we can differentiate between soda sweetened with fructose and diet soda.

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  • 11. 

    To test for lipids you need to conduct a __________ Test

    Correct Answer
    Sudan IV
    Explanation
    To test for lipids, you need to conduct a Sudan IV test. Sudan IV is a dye that is used to stain lipids. When Sudan IV is added to a sample containing lipids, it binds to the lipids and causes them to turn red. This color change is indicative of the presence of lipids. Therefore, by conducting a Sudan IV test, you can determine whether or not lipids are present in a given sample.

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  • 12. 

    To test for sugar, conduct the test for sugars using _______ Solution.

    Correct Answer
    Benedict's
    Benedicts
    Explanation
    The correct answer is "Benedict's". Benedict's solution is used to test for the presence of reducing sugars. It is a reagent that contains copper sulfate, sodium citrate, and sodium carbonate. When heated with a reducing sugar, such as glucose or fructose, the solution changes color from blue to green, yellow, orange, or red, depending on the concentration of sugar present. On the other hand, "Benedicts" is not a valid answer as it is not a recognized solution for testing sugars.

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  • 13. 

    ____________ sample serves as a control to give negative results to each of the chemical test

    Correct Answer
    Distilled Water
    Explanation
    Distilled water is used as a control in chemical tests because it does not contain any impurities or substances that could interfere with the test results. By using distilled water as a control, any negative results obtained can be attributed to the absence of the specific chemical being tested for, rather than any interference from the water itself. This helps to ensure the accuracy and reliability of the chemical tests.

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  • 14. 

    Required inorganic (non carbon containing) nutrients such as calcium and potassium

    Correct Answer
    Minerals
    Mineral
    Explanation
    Inorganic nutrients such as calcium and potassium are commonly referred to as minerals. These minerals are essential for various biological processes in the body and play a crucial role in maintaining overall health. They are required in small quantities but are vital for the proper functioning of cells, nerves, muscles, and other body systems. Therefore, minerals are the correct answer to the question.

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  • 15. 

    A simple sugar or a larger molecule composed of multiple sugar units

    Correct Answer
    Carbohydrates
    Carbs
    Carbohydrate
    Explanation
    Carbohydrates refer to a group of molecules that include both simple sugars and larger molecules composed of multiple sugar units. They are commonly known as carbs and are an essential source of energy for the body. Carbohydrates can be found in various foods such as grains, fruits, vegetables, and dairy products. They play a crucial role in providing fuel for the body's functions and are an important part of a balanced diet.

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  • 16. 

    Necessary organic molecules that our bodies do not construct from other molecules; we require _________ in our diets in only small amounts

    Correct Answer
    Vitamins
    Explanation
    Our bodies cannot synthesize certain organic molecules, known as vitamins, from other molecules. Therefore, we need to obtain these essential nutrients from our diets in small amounts to maintain optimal health. Vitamins play crucial roles in various bodily functions, such as metabolism, immune system function, and cell growth. Without an adequate intake of vitamins, deficiencies can occur, leading to various health problems. Therefore, including vitamins in our diets is necessary to ensure proper functioning and overall well-being.

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  • 17. 

    Large organic molecules of which all cells are made

    Correct Answer
    Macromolecules
    Explanation
    Macromolecules are large organic molecules that make up all cells. They are essential for various cellular functions and include proteins, nucleic acids, carbohydrates, and lipids. These molecules are composed of smaller subunits and are responsible for carrying out important biological processes within cells. Therefore, the term "macromolecules" accurately describes the large organic molecules that constitute cells.

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  • 18. 

    Two monosaccharides are joined to form _________.Ex. Sucrose (common table sugar)Maltose(found in many seeds)Lactose (Milk sugar)

    Correct Answer
    Disaccharides
    Disaccharide
    Explanation
    Two monosaccharides are joined together through a glycosidic bond to form disaccharides. Examples of disaccharides include sucrose, maltose, and lactose. Disaccharides are a type of carbohydrate composed of two sugar molecules, and they are commonly found in various foods such as table sugar, seeds, and milk.

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  • 19. 

    More than two monosaccharides are bonded together, the resulting large carbohydrate molecule is called ___________.

    Correct Answer
    Polysaccharide
    Polysaccharides
    Explanation
    When more than two monosaccharides are bonded together, the resulting molecule is called a polysaccharide. Polysaccharides are large carbohydrate molecules made up of repeating units of monosaccharides. They serve as energy storage molecules in plants and animals and play important structural roles in cell walls and exoskeletons. Examples of polysaccharides include starch, glycogen, and cellulose.

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  • 20. 

    _________ are oily or greasy compounds insoluble in water, but dissolvable in non polar solvents such as ether or chloroform.

    Correct Answer
    Lipids
    Explanation
    Lipids are oily or greasy compounds that cannot dissolve in water but can dissolve in non polar solvents like ether or chloroform. They are hydrophobic molecules composed of carbon, hydrogen, and oxygen atoms. Lipids serve various functions in the body, including energy storage, insulation, and protection of organs. They are also important components of cell membranes and are involved in the synthesis of hormones. Common examples of lipids include fats, oils, waxes, and cholesterol.

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  • 21. 

    All proteins are chains of _____________.

    Correct Answer
    Amino Acids
    Explanation
    Proteins are composed of amino acids, which are organic compounds containing an amino group (-NH2) and a carboxyl group (-COOH). These amino acids are linked together by peptide bonds to form polypeptide chains, which then fold into a specific three-dimensional structure to carry out their functions in the body. Therefore, it is correct to say that all proteins are chains of amino acids.

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