Biology And Chemistry - Mixed Science Quiz

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  • 1/15 Questions

    Choose the element that is found in all organic compounds:

    • Carbon
    • Hydrogen
    • Nitrogen
    • Oxygen
    • Sulphur
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Biology And Chemistry - Mixed Science Quiz - Quiz
About This Quiz

Science is distributed into different branches. Out of these, chemistry and biology are one of the most important! Where biology deals with the science of life, Chemistry is the branch that studies the behavior of matter.
Take this mixed science quiz with from both biology and chemistry. ALL THE BEST!

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  • 2. 

    When two organic molecules are joined together, and a water molecule is removed, the reaction is called which of the following?

    • Hydrogenation

    • Oxidation

    • Dehydration synthesis (condensation)

    • Reduction

    • Hydrolysis

    Correct Answer
    A. Dehydration synthesis (condensation)
    Explanation
    Dehydration synthesis (condensation) is the correct answer because when two organic molecules are joined together, a water molecule is removed in the process. This type of reaction is commonly known as dehydration synthesis or condensation reaction. In this reaction, a covalent bond is formed between the two molecules, resulting in the formation of a larger molecule and the release of a water molecule as a byproduct. This process is essential for building complex biological molecules such as proteins, carbohydrates, and nucleic acids.

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  • 3. 

    The following structural formula is representative of which functional group?

    • Hydroxyl

    • Carboxyl

    • Sulfhydryl

    • Amino

    • Carbonyl

    Correct Answer
    A. Carboxyl
    Explanation
    The given structural formula contains a carbon atom bonded to both an oxygen atom and a hydroxyl group. This arrangement is characteristic of the carboxyl functional group, which is found in carboxylic acids. Carboxyl groups are important in various biological molecules such as amino acids and fatty acids, and they are involved in processes such as protein synthesis and metabolism.

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  • 4. 

    In humans, the function of glycogen is to:

    • Dilute the blood plasma

    • Increase osmotic pressure in cells

    • Synthesize proteins

    • Store glucose in plants

    • Keep glucose available

    Correct Answer
    A. Keep glucose available
    Explanation
    The function of glycogen in humans is to keep glucose available. Glycogen is a polysaccharide that serves as a storage form of glucose in the body. It is stored in the liver and muscles and can be broken down into glucose when the body needs energy. This ensures a constant supply of glucose is available for various metabolic processes and to maintain blood sugar levels within the normal range.

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  • 5. 

    Which of the following is the essential characteristic of a polar molecule?

    • Is formed at extremely low temperatures

    • Has an asymmetrical distribution of electrical charge

    • Contains double or triple bonds

    • Contains the element oxygen

    • Contains ions as part of the structure

    Correct Answer
    A. Has an asymmetrical distribution of electrical charge
    Explanation
    A polar molecule is characterized by having an asymmetrical distribution of electrical charge. This means that the molecule has a positive end and a negative end, resulting in a dipole moment. This occurs when there is an uneven sharing of electrons between atoms in a molecule, causing one end to be more electronegative than the other. The presence of double or triple bonds, the element oxygen, or ions as part of the structure may contribute to the polarity of a molecule, but they are not the essential characteristic.

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  • 6. 

    Which three of the following are characteristics of hydrogen bonds?1. They are responsible for the surface tension properties of water.2. They are responsible for the relatively high boiling point of water.3. They are stronger than ionic bonds.4. They are present in all substances.5. They are weaker than covalent bonds.

    • 1, 2, and 5

    • 2, 3, and 4

    • 3, 4, and 5

    • 1, 3, and 4

    • 1, 3, and 5

    Correct Answer
    A. 1, 2, and 5
    Explanation
    Hydrogen bonds are responsible for the surface tension properties of water because they cause the water molecules to stick together, creating a cohesive force at the surface. They are also responsible for the relatively high boiling point of water because the hydrogen bonds require more energy to break, resulting in a higher boiling point. Additionally, hydrogen bonds are weaker than covalent bonds, as they involve an electrostatic attraction between a hydrogen atom and a highly electronegative atom. Therefore, the correct characteristics of hydrogen bonds are 1, 2, and 5.

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  • 7. 

    A chemical bond involving carbon and hydrogen (C-H) is present in many biological molecules. Based upon their electronegativities, the bond could be described as:

    • Both ionic and covalent

    • A covalent bond

    • A weak ionic bond

    • A strong ionic bond

    • A hydrogen bond

    Correct Answer
    A. A covalent bond
    Explanation
    A covalent bond is the correct answer because a bond involving carbon and hydrogen is typically formed by the sharing of electrons between the two atoms. In a covalent bond, the electrons are shared rather than transferred, which is consistent with the nature of the C-H bond. This type of bond is commonly found in biological molecules such as carbohydrates, lipids, and proteins.

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  • 8. 

    Of the following, which are reasons why molecular models are useful to biologists? Models help:1. Visualize the shape of functional groups2. Visualize geometric isomers3. Visualize the three-dimensional shapes of molecules4. Determine the presence of symmetry in molecules5. Predict products of chemical reactions

    • 1 and 2

    • 3, 4, and 5

    • 1 only

    • 1, 2, 3, 4, and 5

    • 1, 2, 4, and 5

    Correct Answer
    A. 1, 2, 3, 4, and 5
    Explanation
    Molecular models are useful to biologists because they can help visualize the shape of functional groups, visualize geometric isomers, visualize the three-dimensional shapes of molecules, determine the presence of symmetry in molecules, and predict products of chemical reactions. Therefore, the correct answer is 1, 2, 3, 4, and 5.

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  • 9. 

    The hydrolysis (breakdown) of an ester results in:

    • Two acids

    • Two sugars

    • A sugar and an acid

    • An acid and an alcohol

    • An acid and an amine

    Correct Answer
    A. An acid and an alcohol
    Explanation
    When an ester undergoes hydrolysis, it is broken down into its constituent components, which are an acid and an alcohol. This process involves the addition of water to the ester molecule, leading to the cleavage of the ester bond. The oxygen atom in the ester bond forms a bond with a hydrogen atom from water, resulting in the formation of an alcohol. Simultaneously, the carbon atom in the ester bond becomes a part of a carboxylic acid, leading to the formation of an acid. Therefore, the correct answer is "An acid and an alcohol."

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  • 10. 

    Which of the functional groups illustrated below would you expect to find in an amino acid?

    • 2 and 3

    • 1 and 4

    • 1, 2, and 4

    • 3 and 5

    • 2, 4, and 5

    Correct Answer
    A. 1 and 4
    Explanation
    Amino acids are the building blocks of proteins and contain an amino group (-NH2) and a carboxyl group (-COOH). Option 1 and 4 both have these functional groups. Option 1 has a carboxyl group (COOH) and option 4 has an amino group (NH2). Therefore, these functional groups are expected to be found in an amino acid.

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  • 11. 

    The hydrolysis (breakdown) of a dipeptide results in the production of which of the following?

    • Two amino acids

    • Two sugars

    • A sugar and an amino acid

    • An amino acid and an alcohol

    • An acid and an amine

    Correct Answer
    A. Two amino acids
    Explanation
    The hydrolysis of a dipeptide involves the breaking of the peptide bond between two amino acids. This process results in the production of two separate amino acids.

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  • 12. 

    When fatty acids and glycerol chemically combine to for a fat, one other product is produced. This product is:

    • ATP

    • Water

    • Carbon dioxide

    • An amino group

    • A monosaccharide

    Correct Answer
    A. Water
    Explanation
    When fatty acids and glycerol chemically combine to form a fat, the process is called esterification. In this process, a condensation reaction occurs, where a water molecule is released as a byproduct. Therefore, the correct answer is water.

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  • 13. 

    When a molecule of glycerol reacts with one or more fatty acids, an ester linkage results. The formation of this linkage is a result of a reaction between:

    • Two alcohols

    • Two carboxylic acids

    • An amino acid and a carboxylic acid

    • Two amino acids

    • An alcohol and a carboxylic acid

    Correct Answer
    A. An alcohol and a carboxylic acid
    Explanation
    When a molecule of glycerol reacts with one or more fatty acids, an ester linkage is formed. This ester linkage is the result of a reaction between an alcohol (glycerol) and a carboxylic acid (fatty acid). The hydroxyl group (-OH) of the alcohol reacts with the carboxyl group (-COOH) of the carboxylic acid, resulting in the formation of an ester bond (-COO-). This reaction is known as esterification and is a common process in the synthesis of lipids, such as triglycerides.

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  • 14. 

    Many people are aware that water is the most abundant substance in all organisms. However, next to water, what is the major component of living cells?

    • Carbohydrates

    • Vitamins

    • Nucleotides

    • Lipids

    • Proteins

    Correct Answer
    A. Proteins
    Explanation
    Proteins are the major component of living cells, second only to water. They play crucial roles in various cellular functions such as structural support, enzymatic reactions, and transportation of molecules. Proteins are made up of amino acids and are essential for the growth, repair, and maintenance of tissues in organisms. They are involved in almost every biological process and are responsible for the diversity and complexity of living organisms.

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  • 15. 

    In terms of maintaining the shape of an enzyme, the strongest bonds involved are:

    • Dipole-dipole interactions

    • Hydrogen bonds

    • Covalent (disulfide) bonds

    • Hydrophobic bonds

    • Ionic interactions

    Correct Answer
    A. Covalent (disulfide) bonds
    Explanation
    Covalent (disulfide) bonds are the strongest bonds involved in maintaining the shape of an enzyme. These bonds form between two cysteine residues in the enzyme's polypeptide chain, creating a covalent link called a disulfide bond. Disulfide bonds are highly stable and can withstand harsh conditions, allowing them to provide structural support to the enzyme. This helps the enzyme maintain its specific shape, which is crucial for its proper functioning. The other bond types listed, such as dipole-dipole interactions, hydrogen bonds, hydrophobic bonds, and ionic interactions, are also important for enzyme structure but are generally weaker than covalent bonds.

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  • Mar 16, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 23, 2010
    Quiz Created by
    Rflores314
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