Cells Unit Pre-assessment (Grade 8) Quiz

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Cells Unit Pre-assessment (Grade 8) Quiz - Quiz

Cells are the basic building blocks of living things. We have so far learned that the human body is composed of trillions of cells, all with their own specialized function. The Cells unit pre-assessment (grade 8) quiz will help you understand more. Give it a shot and all the best!


Questions and Answers
  • 1. 

    Arrange the following levels of organization from least complex to most complex:  cells, organelles, tissues, organs, organisms, and organ systems. (Standard 1.2a)

    • A.

      Organelles, cells, tissues, organs, organ systems, organisms

    • B.

      Cells, organelles, tissues, organs, organ systems, organisms

    • C.

      Organelles, cells, organs, organ systems, tissues, organism

    • D.

      Cells, organelles, organs, organ systems, tissue, organism

    • E.

      Cells, tissues, organs, organelles, organ systems, organism

    Correct Answer
    A. Organelles, cells, tissues, organs, organ systems, organisms
    Explanation
    The correct answer arranges the levels of organization from least complex to most complex. It starts with organelles, which are small structures within cells, then moves on to cells, which are the basic building blocks of life. Next are tissues, which are groups of similar cells working together, followed by organs, which are made up of different tissues working together. Organ systems come next, which are groups of organs working together to perform a specific function. Finally, organisms are the most complex level of organization, referring to individual living beings.

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  • 2. 

    The body cells of most multicellular animals are not in direct contact with the external environment. These cells are supplied with materials from the environment by (Standard 1.2e):

    • A.

      A central nervous system

    • B.

      Hydrolytic enzymes

    • C.

      Sense receptors

    • D.

      A circulatory system

    • E.

      Symbiotic bacteria

    Correct Answer
    D. A circulatory system
    Explanation
    The body cells of most multicellular animals are not in direct contact with the external environment. They rely on a circulatory system to supply them with materials from the environment. The circulatory system, which includes the heart, blood vessels, and blood, transports oxygen, nutrients, and other necessary substances to the cells. Without a circulatory system, the cells would not receive the essential materials they need to function properly.

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  • 3. 

    Structures found in a plant cell, but not an animal cell, include the following: (Standards 1.2 f, 5.1b)

    • A.

      Chloroplasts, a cell wall, and a large vacuole

    • B.

      Chloroplasts, a cell wall, and mitochondria

    • C.

      Chloroplasts, centrioles, and Golgi apparatus

    • D.

      Centrioles, a cell membrane, and a nucleus

    • E.

      Centrioles, mitochondria, and a nucleus

    Correct Answer
    A. Chloroplasts, a cell wall, and a large vacuole
    Explanation
    Plant cells have chloroplasts, which are responsible for photosynthesis and contain chlorophyll. Animal cells do not have chloroplasts. Plant cells also have a cell wall, which provides structural support and protection. Animal cells do not have a cell wall, instead they have a cell membrane. Additionally, plant cells have a large central vacuole, which stores water, nutrients, and waste products. Animal cells may have smaller vacuoles, but not a large central vacuole like plant cells. Therefore, the correct answer is chloroplasts, a cell wall, and a large vacuole.

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  • 4. 

    The cell structure responsible for controlling which molecules enter and leave the cell and for the recognition of chemical signals is the: (Standard 1.2g)

    • A.

      Cell wall

    • B.

      Nucleus

    • C.

      Mitochondria

    • D.

      Chloroplast

    • E.

      Cell membrane

    Correct Answer
    E. Cell membrane
    Explanation
    The cell membrane is responsible for controlling the movement of molecules in and out of the cell. It acts as a barrier, allowing certain molecules to pass through while blocking others. The cell membrane also plays a role in recognizing and responding to chemical signals, allowing the cell to communicate with its environment. Unlike the cell wall, which provides structural support, the nucleus, which contains genetic material, the mitochondria, which produce energy, and the chloroplast, which carry out photosynthesis, the cell membrane is specifically involved in regulating the movement of molecules and chemical signaling.

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  • 5. 

    Which statement best describes the function of a cell? (Standard 1.2h)

    • A.

      Large organic food molecules like protein must be initially broken down. Once the broken down nutrient enters the cell, the cell will use the building blocks to synthesize organic compounds necessary for life.

    • B.

      Large organic food molecules like protein directly enter the cell where they are used for energy.

    • C.

      Large organic food molecules like protein are broken down only after they enter the cell. Once broken down, the cell will excrete the broken down substances.

    • D.

      The cell makes its own protein and does not need nutrients from the outside environments.

    • E.

      The function of the cell is to convert proteins to amino acids.

    Correct Answer
    A. Large organic food molecules like protein must be initially broken down. Once the broken down nutrient enters the cell, the cell will use the building blocks to synthesize organic compounds necessary for life.
    Explanation
    The correct answer describes the process of how large organic food molecules like protein are broken down before entering the cell. Once broken down, the cell uses the building blocks to synthesize organic compounds necessary for life. This explanation aligns with the understanding that cells require nutrients from the outside environment and must break them down before utilizing them for various cellular functions.

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  • 6. 

    The organelle most directly involved in cellular aerobic respiration is the (Standard 1,2 i):

    • A.

      Ribosome

    • B.

      Mitochondrion

    • C.

      Nucleus

    • D.

      Lysosome

    • E.

      Golgi apparatus

    Correct Answer
    B. Mitochondrion
    Explanation
    The mitochondrion is the organelle most directly involved in cellular aerobic respiration. This is because it is responsible for producing the majority of the cell's energy in the form of ATP through the process of aerobic respiration. The mitochondrion contains enzymes and proteins necessary for the various steps of aerobic respiration, including the citric acid cycle and the electron transport chain. Without the mitochondrion, cells would not be able to efficiently produce energy through aerobic respiration.

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  • 7. 

    Which substances are secreted at the endings of nerve cells?  (Standard 1.2j)

    • A.

      Antibodies

    • B.

      Antigens

    • C.

      Neurotransmitters

    • D.

      Lipids

    • E.

      Neurons

    Correct Answer
    C. Neurotransmitters
    Explanation
    Neurotransmitters are substances that are secreted at the endings of nerve cells. They are responsible for transmitting signals between nerve cells, allowing for communication within the nervous system. Neurotransmitters play a crucial role in various physiological processes such as muscle movement, memory, and emotions. They are released from the presynaptic neuron into the synapse, where they bind to receptors on the postsynaptic neuron, initiating a response.

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  • 8. 

    Which activity, illustrated in the diagram below, is being performed by the ameba (a single-celled protist)? (Standard 1.3a)

    • A.

      Egestion

    • B.

      Synthesis

    • C.

      Circulation

    • D.

      Ingestion

    • E.

      Respiration

    Correct Answer
    D. Ingestion
    Explanation
    The ameba is shown in the diagram engulfing a food particle, which indicates that it is performing the activity of ingestion. Ingestion is the process of taking in food or nutrients into the body, and in this case, the ameba is using its pseudopodia to surround and engulf the food particle. This allows the ameba to obtain nutrients and energy from the ingested food.

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  • 9. 

    The production of energy-rich ATP molecules is the direct result of (Standard 5.1 e)

    • A.

      Recycling light energy to be used in the process of photosynthesis

    • B.

      Releasing the stored energy of organic compounds by the process of respiration

    • C.

      Breaking down starch by the process of digestion

    • D.

      Copying coded information during the process of protein synthesis

    Correct Answer
    B. Releasing the stored energy of organic compounds by the process of respiration
    Explanation
    The correct answer is "Releasing the stored energy of organic compounds by the process of respiration." Respiration is the process by which cells break down organic compounds, such as glucose, to release energy in the form of ATP. This process occurs in the mitochondria of cells and is a fundamental way for organisms to obtain energy for their cellular activities. Recycling light energy to be used in the process of photosynthesis is incorrect because photosynthesis is the process by which light energy is converted into chemical energy, not the other way around. Breaking down starch by the process of digestion is incorrect because digestion is the process by which complex molecules are broken down into simpler ones, but it does not directly produce ATP. Copying coded information during the process of protein synthesis is incorrect because protein synthesis is the process by which cells make proteins, not ATP.

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  • 10. 

    The diagram below represents some events that take place in a plant cell. The letters X, Y, and Z most likely represent (Standards 5.1a, 5.1b):

    • A.

      Carbon Dioxide, Light, and Water

    • B.

      Oxygen, Carbon Dioxide, and Nitrogen

    • C.

      Glucose, Light, and Carbon Dioxide

    • D.

      Nitrogen, Oxygen, and Water

    • E.

      Light, Oxygen, and Methane

    Correct Answer
    A. Carbon Dioxide, Light, and Water
    Explanation
    The diagram represents events in a plant cell, suggesting that it is related to photosynthesis. Photosynthesis is the process by which plants use carbon dioxide, light, and water to produce glucose and oxygen. Therefore, the letters X, Y, and Z most likely represent carbon dioxide, light, and water, which are the key components involved in photosynthesis.

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  • 11. 

    Hydrogen peroxide (H2O2) is a toxic by-product of cellular metabolism in aerobic organisms. The reaction below occurs within the cells to prevent the accumulation of hydrogen peroxide. In this reaction, catalase functions as an:

    • A.

      Enzyme in the breakdown of hydrogen peroxide

    • B.

      Enzyme in the synthesis of hydrogen peroxide

    • C.

      Emulsifier in the digestion of hydrogen peroxide

    • D.

      Indicator in the detection of hydrogen peroxide

    • E.

      Inhibitor preventing the digestion of hydrogen peroxide

    Correct Answer
    A. Enzyme in the breakdown of hydrogen peroxide
    Explanation
    Catalase is an enzyme that catalyzes the breakdown of hydrogen peroxide into water and oxygen. This reaction helps prevent the accumulation of hydrogen peroxide, which is toxic to cells. Therefore, catalase functions as an enzyme in the breakdown of hydrogen peroxide.

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  • 12. 

    The movement of water from an area of higher concentration to an area of lower concentration is known as

    • A.

      Diffusion

    • B.

      Osmosis

    • C.

      Active Transport

    • D.

      Hydrolysis

    • E.

      Phagocytosis

    Correct Answer
    B. Osmosis
    Explanation
    Osmosis is the process in which water molecules move from an area of higher concentration to an area of lower concentration through a semi-permeable membrane. This movement occurs in order to equalize the concentration of solute on both sides of the membrane. It is a passive process that does not require energy expenditure. Diffusion, on the other hand, refers to the movement of particles, including solute molecules, from an area of higher concentration to an area of lower concentration. Active transport, hydrolysis, and phagocytosis are not relevant to the movement of water molecules.

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  • 13. 

    Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how much do you already know about cells and cell processes?

    Correct Answer
    1
    2
    3
    4
    Explanation
    The given correct answer is 1,2,3,4. This indicates that the respondent can rate their knowledge about cells and cell processes on a scale of 1 to 4, with 1 being the lowest and 4 being the highest. The answer suggests that the respondent has the option to choose any number from 1 to 4 to indicate their level of knowledge in this area.

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  • 14. 

    Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how interested are you in cells and cell processes?

    Correct Answer
    1
    2
    3
    4
    Explanation
    The question asks the respondent to rate their interest in cells and cell processes on a scale of 1 to 4, with 1 being the lowest and 4 being the highest. The answer provided is 1,2,3,4, which suggests that the respondent is equally interested in all levels of interest, from the lowest to the highest.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 08, 2009
    Quiz Created by
    Tagscience
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