Cell Biology & Genetics - Principles Of Cellular Life

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| By Caroline Estrada
Caroline Estrada, Medical editor
Carolina, a dedicated researcher, scientist, and medical editor, contributes to the advancement of scientific knowledge and the dissemination of medical information.
Quizzes Created: 5 | Total Attempts: 3,103
| Attempts: 223
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  • 1/25 Questions

    Hydrophilic dissolve easily in water, while hydrophobic substances do not. 

    • True
    • False
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About This Quiz

Here is a quiz to prepare you for cell biology class with key concepts such as : Atoms and elements, why electrons matter, atom bonding, water of life, the power of hydrogen, etc. With the knowledge of these fundamental concepts, we turn to the first of life's levels of organisation: atoms and energy.

Cell Biology & Genetics - Principles Of Cellular Life - Quiz

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  • 2. 

     Polar covalent bonds do not share electrons equally. Such bonds can form between atoms with small differences in electronegativity.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Polar covalent bonds occur when the electrons in a bond are not shared equally between the atoms involved. This happens when there is a difference in electronegativity, which is the ability of an atom to attract electrons towards itself. If the electronegativity difference between the atoms is small, a polar covalent bond can form. Therefore, the given statement is true.

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  • 3. 

     Mrs. Salvador writes this on the board : pH is a measure of the number of hydrogen ions in a solution. Is she correct?

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Mrs. Salvador is correct. pH is indeed a measure of the number of hydrogen ions in a solution. It is a scale that ranges from 0 to 14, with 0 being highly acidic, 7 being neutral, and 14 being highly alkaline. The pH value indicates the acidity or alkalinity of a solution based on the concentration of hydrogen ions present. Therefore, the statement is true.

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  • 4. 

    A molecule is formed when two or more atoms of the same different elements join in chemical bonds. 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Atoms with vacancies can form chemical bonds. Chemical bonds connect atoms into molecules.

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  • 5. 

     Acids release H+ and bases accept H+.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Acids are substances that release hydrogen ions (H+) when dissolved in water, while bases are substances that accept hydrogen ions. This statement is true because it accurately describes the behavior of acids and bases. Acids donate H+ ions, which increases the concentration of H+ in a solution, while bases accept H+ ions, which decreases the concentration of H+.

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  • 6. 

    Atoms are tiny particles, the _________ _________ of all substances. 

    Correct Answer
    building blocks
    Explanation
    Atoms are the fundamental units or "building blocks" of all substances. They are the smallest particles that make up matter and cannot be broken down into smaller components without losing their chemical properties. Atoms combine together to form molecules and compounds, which then make up the various substances we encounter in our daily lives. Therefore, the correct answer is "building blocks."

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  • 7. 

    Which type of bonding usually forms stronger bonds? 

    • Covalent bonds.

    • Ionic bonds.

    Correct Answer
    A. Covalent bonds.
    Explanation
    Covalent bonds tend to be stronger than ionic bonds, but they are not always so.

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  • 8. 

    During a test you hear a student bursting with an insight for question #6. The student says: Cohesion breaks water molecules apart! Is the student correct?

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Cohesion keeps water molecules together. It means that molecules resist seperating from one another. E.g: Water with its hydrogen bonds. The bond is so strong that the molecules stay together rather than spreading out like a thin film when you throw a pebble into a pond.

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  • 9. 

     Your little sister comes up to you with her homework. She tells you she doesn't understand her bonus question. The question is: What is the difference between solutes and solvents? Can you answer it?

    • Solutes dissolve in a solvent.

    • Solvents dissolve in a solute.

    Correct Answer
    A. Solutes dissolve in a solvent.
    Explanation
    An example of a solvent is water.

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  • 10. 

     For a solution to be neutral or 7 (numerical form), the number of H+ ions must be the _____ to the number of OH- ions.

    Correct Answer
    same
    Explanation
    In order for a solution to be neutral, the number of H+ ions (acidic) must be the same as the number of OH- ions (basic). This balance of acidic and basic ions results in a solution with a pH value of 7.

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  • 11. 

    Janie was faced with a thief when she crossed the forbidden road. The thief asked her a question about acids and bases! The only way she could escape him was by getting his question correctly. Can you help Jennie escape? The Question: What is a buffer system?

    • It keeps a solution within a consistent range of pH.

    • It alters the chemical compounds in the solution and makes it more acidic or more basic.

    • It acts like a radiosotope and disintegrates the consistent range of pH.

    • Polishes rocks and non-living organims' pH.

    Correct Answer
    A. It keeps a solution within a consistent range of pH.
    Explanation
    A buffer system is a solution that helps maintain a consistent pH level. It resists changes in pH when small amounts of acid or base are added to it. This is important because many biological processes and reactions require a specific pH level to function properly. By keeping the pH within a consistent range, a buffer system ensures that these processes can occur smoothly without any drastic changes in acidity or basicity.

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  • 12. 

    During a biology lecture, the teacher notices that students are half listening and decides to give a surprise quiz with one question. She writes "Some covalent bonds are nonpolar. What does this mean? "  Which of these answers is correct?

    • ....there is a difference in charge between the two ends of such bond.

    • ....the atoms participating in the bond are sharing electrons equally.

    • ....they are formed between ions with different electronegativity.

    Correct Answer
    A. ....the atoms participating in the bond are sharing electrons equally.
    Explanation
    If nonpolar, the atoms participating in the bond are sharing electrons equally. There is no difference in charge between the two ends of such bonds. Nonpolar covalent bonds form between atoms with identical electronegativity.

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  • 13. 

    Joe is in the new laboratory and is told to put up a personalised pH scale. If you were in his position, what range would you use for the pH scale?

    • 0-7

    • 7-14

    • -7-7

    • -7-14

    • 5-26

    • 0-14

    Correct Answer
    A. 0-14
    Explanation
    0-7 is acidic, 7-14 is basic. 7 is neutral.

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  • 14. 

    Your friend Jonathan has a test in 2 minutes and he runs towards you to ask you this question: What do isotopes of the same element have in common? What do you answer him to be correct?

    • They have the same number of protons.

    • They have the same number of neutrons.

    • They have the same mass number.

    Correct Answer
    A. They have the same number of protons.
    Explanation
    Isotopes of the same element have the same number of protons. This is because isotopes are atoms of the same element that have different numbers of neutrons, but the same number of protons. The number of protons determines the element's identity, so isotopes of the same element will always have the same number of protons. The number of neutrons may vary, which results in different mass numbers for different isotopes.

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  • 15. 

    Your friend Maria tells you that the teacher did not correct her test properly. She claims to have a right answer. Is the statement below true or did the teacher really make a mistake? Statement: An element is a pure substance. Each kind consists only of atoms with different number of protons. 

    • It is True, the teacher made a mistake.

    • It is False, Maria did get the question wrong.

    Correct Answer
    A. It is False, Maria did get the question wrong.
    Explanation
    An element is a pure substance. Each kind consists only of atoms with the same number of protons. Maria is wrong.

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  • 16. 

     What are compounds?

    • They are two or more substances that intermingle and thier proportions can vary.

    • They are two or more substances that do not bond, but form compounds.

    • They are molecules that consist of two or more different elements in proportions that do not vary. They do not bond however.

    • They are molecules that consist of two or more different elements in proportions that do not vary. They do bond together.

    Correct Answer
    A. They are molecules that consist of two or more different elements in proportions that do not vary. They do bond together.
    Explanation
    Water is an example. All water molecules have one oxygen and two hydrogen atoms. In a sea or lake, an ocean or a pool, its molecules have twice as many hydrogen as oxygen atoms.

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  • 17. 

    Evaporation helps liquid water stabilize ___________. 

    Correct Answer
    temperature
    Explanation
    Evaporation heat energy converts liquid water to gas. It takes heat to convert liquid water to gas, so the surface temperature of water decreases during evaporation. ( Can cool you off when you sweat)

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  • 18. 

    Cellia was in cell biology class when she suddenly fell asleep. The teacher noticed and called upon her. Cellia turns around and asks you the question so you can help her. Question: What do salts release?

    • OH- ions.

    • H+ ions.

    • None of the above.

    Correct Answer
    A. None of the above.
    Explanation
    Salts are dissolved easily in water and release ions other than H+ or OH-. For example= NaCl --- > Na+ + Cl-.

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  • 19. 

     Any seperation that pulls the electron a little more towards it ''end'' of the bond so that the atom bears a slightly negative charge making the other bear a positive charge; into distinct positive and and negative regions; is called __________.

    Correct Answer
    polarity
    Explanation
    Polarity refers to the separation of charges in a molecule or bond. When there is a difference in electronegativity between atoms in a bond, the electrons are pulled towards the more electronegative atom, creating a slightly negative charge on that atom and a slightly positive charge on the other atom. This separation of charges creates distinct positive and negative regions in the molecule or bond, which is known as polarity.

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  • 20. 

     A chemical bond is an ________ _____ that arises between two atoms when their electrons interact.

    Correct Answer
    attractive force
    Explanation
    A chemical bond is an attractive force that arises between two atoms when their electrons interact. This force pulls the atoms together and forms a bond between them. The electrons of one atom are attracted to the positively charged nucleus of the other atom, creating a stable arrangement. This attraction allows the atoms to share, transfer, or redistribute their electrons, leading to the formation of various types of chemical bonds such as covalent, ionic, or metallic bonds. Overall, the attractive force between the electrons of two atoms plays a crucial role in holding molecules and compounds together.

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  • 21. 

    Which of the following statements is false?  

    • The amount of heat required to raise the temperature of 1g of 1degree celsius water is 1 calorie.

    • Water heats up and cools down very quickly.

    • Due to hydrogen bonds, water has a high surface tension.

    • When water evaporates, it removes heat.

    • Large bodies of water has relatively constant temperatures.

    Correct Answer
    A. Water heats up and cools down very quickly.
    Explanation
    Compared to other liquids, water absorbs more heat before it becomes measurably hotter, since the water temperature is stable. This is due to the extensive hydrogen bonding that restricts the jiggling of water molecules.

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  • 22. 

    What are some properties of a mixture? 

    • 2 or more substances intermingle

    • The substances form chemical bond.

    • Their proportions cannot vary.

    • The substances do not form chemical bonds.

    • Their proportions can vary.

    • They can create strong reactions due to the bonds formed.

    • They create molecules as they are mixed.

    Correct Answer(s)
    A. 2 or more substances intermingle
    A. The substances do not form chemical bonds.
    A. Their proportions can vary.
    Explanation
    A mixture is a combination of two or more substances that intermingle without forming chemical bonds. This means that the substances retain their individual properties and can be separated physically. Additionally, in a mixture, the proportions of the substances can vary, meaning that different amounts of each substance can be present in the mixture.

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  • 23. 

    Electronegativity is a measure of an atom's ability to pull electrons from other atoms. It is a measure of charge. 

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Electronegativity is a measure of an atom's ability to pull electrons from other atoms. Whether the pull is strong or weak depends on the atom's size and how many vacancies it has; it is not a measure of charge. Example: A chlorine atom uncharged, it has 17 protons and 17 electrons. On its valence electron's shell, it has 7 electrons. (which can hold eight) It has one vacancy. An uncharged chlorine atom is highly electronegative--- it can pull an electron away from another atom and fill its third shell.It would then become a chlorine ion. ( Cl-)

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  • 24. 

     Timothy is trying to help his mom to put away her groceries and tems she bought from the pharmacy. She tells him that she puts them away by seperating the acids from bases. Timothy is given the list of solutions that were bought. Check off the basic solutions.

    • Oven cleaner.

    • Bananas.

    • Gastric fluid.

    • Vinegar.

    • Lemon juice.

    • Ammonia.

    • Blood.

    • Pure water.

    • Tums.

    • Beer.

    • Egg white.

    • Cola.

    • Toothpaste.

    • Bleach.

    • Hair remover.

    • Typical rain.

    • Black coffee.

    • Bread.

    Correct Answer(s)
    A. Oven cleaner.
    A. Ammonia.
    A. Blood.
    A. Tums.
    A. Egg white.
    A. Toothpaste.
    A. Bleach.
    A. Hair remover.
    Explanation
    Basic solutions are substances that have a pH greater than 7. In the given list, the basic solutions are oven cleaner, ammonia, blood, Tums, egg white, toothpaste, bleach, and hair remover. These substances are known to have a pH greater than 7 and therefore can be classified as basic solutions.

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  • 25. 

     Ionic bonds usually form by the direct transfer of an electron from one atom to another.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Ionic bond, which is a strong mutual attraction of two oppositely charged ion, does not usually form by the direct transfer of an electron from one atom to another; rather, atoms that have already become ions stay close together because of their opposite charges. E.g: NaCl; in such solids, ionic bonds hold sodium and chloride ions in an orderly, cubic arrangement.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 25, 2011
    Quiz Created by
    Caroline Estrada
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