Biology Unit 7 Test

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| By Sara.badran.sb
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Biology Unit 7 Test - Quiz


Questions and Answers
  • 1. 

    1-Laughter!     2-Food!!     3-A 10 min walk.     4-Breathe deeply and/or pray/meditate  

  • 2. 

    Which of these cells is a prokaryotic cell?

    • A.

      Plant cell

    • B.

      Animal cell

    • C.

      Bacteria

    • D.

      Fungi

    Correct Answer
    C. Bacteria
    Explanation
    Bacteria is a prokaryotic cell because it lacks a nucleus and other membrane-bound organelles. Prokaryotic cells are typically smaller and simpler in structure compared to eukaryotic cells, such as plant and animal cells. Bacteria are single-celled microorganisms that can be found in various environments and can have different shapes and sizes. They reproduce asexually through binary fission and play important roles in various biological processes, including nutrient cycling and disease-causing infections.

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  • 3. 

    Eukaryotic cells don't have membrane bound organelles.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Eukaryotic cells do have membrane-bound organelles. These organelles, such as the nucleus, mitochondria, Golgi apparatus, and endoplasmic reticulum, are surrounded by a membrane that separates their internal environment from the rest of the cell. This membrane allows for compartmentalization and specialized functions within the cell. Therefore, the statement that eukaryotic cells don't have membrane-bound organelles is false.

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  • 4. 

    Which of these organelles is not found in a prokaryotic cell?

    • A.

      Ribosomes

    • B.

      Cytoplasm

    • C.

      DNA

    • D.

      Membrane bound nucleus

    Correct Answer
    D. Membrane bound nucleus
    Explanation
    Prokaryotic cells are characterized by the absence of a membrane-bound nucleus. Instead, their DNA is found in the cytoplasm in a region called the nucleoid. Ribosomes are present in both prokaryotic and eukaryotic cells and are responsible for protein synthesis. Cytoplasm is the gel-like substance that fills the cell and is present in both types of cells. Therefore, the organelle that is not found in a prokaryotic cell is the membrane-bound nucleus.

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  • 5. 

    Which of these organelles is responsible for attaching bacteria to surfaces? 

    • A.

      Flagella

    • B.

      Cilia

    • C.

      Ribosome

    • D.

      Fimbriae

    Correct Answer
    D. Fimbriae
    Explanation
    Fimbriae are responsible for attaching bacteria to surfaces. Fimbriae are hair-like structures found on the surface of many bacteria that help them adhere to surfaces. They act as tiny hooks or anchors, allowing the bacteria to attach to various surfaces such as host tissues or inanimate objects. This attachment is important for the bacteria to establish infections or form biofilms, which are communities of bacteria that adhere to surfaces and are often difficult to remove. Flagella are responsible for bacterial movement, cilia are found in eukaryotic cells and are involved in cell movement or moving substances along the cell surface, and ribosomes are responsible for protein synthesis.

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  • 6. 

    Functions of bound ribosomes include:

    • A.

      Cytosol storage

    • B.

      Secretion of products

    • C.

      Adding to the membrane (membrane factory)

    • D.

      Two of the above

    Correct Answer
    D. Two of the above
    Explanation
    Bound ribosomes are ribosomes that are attached to the endoplasmic reticulum (ER) membrane. They play a crucial role in protein synthesis and have multiple functions. One of the functions is the secretion of products, where they synthesize proteins that are destined to be exported from the cell. Another function is adding to the membrane, where they synthesize proteins that are inserted into the ER membrane or other cellular membranes. Therefore, the correct answer is "Two of the above" because bound ribosomes are involved in both secretion of products and adding to the membrane.

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  • 7. 

    The endomembrane system contains all of these organelles EXCEPT:

    • A.

      Lysosomes

    • B.

      Proteins

    • C.

      Endoplasmic reticulum (ER)

    • D.

      Golgi Apparatus

    Correct Answer
    B. Proteins
    Explanation
    The endomembrane system is a group of organelles that work together to transport and modify proteins within the cell. It includes the endoplasmic reticulum (ER), Golgi apparatus, and lysosomes. Lysosomes are responsible for breaking down cellular waste, while the ER and Golgi apparatus are involved in protein synthesis and modification. Therefore, the correct answer is "Proteins" as they are not an organelle, but rather a type of biomolecule.

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  • 8. 

    The functions of the smooth endoplasmic reticulum (SER) include all of these options EXCEPT

    • A.

      Synthesis of lipids

    • B.

      Storage of calcium ions

    • C.

      Detoxification of drugs

    • D.

      Metabolism of carbohydrates

    • E.

      None of the above

    Correct Answer
    E. None of the above
    Explanation
    The smooth endoplasmic reticulum (SER) is responsible for various functions in the cell. It plays a crucial role in the synthesis of lipids, storage of calcium ions, and detoxification of drugs. Additionally, it is involved in the metabolism of carbohydrates. Therefore, the correct answer is "None of the above" as all the options listed are functions of the smooth endoplasmic reticulum.

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  • 9. 

    Golgi Apparatus is made up of membranous sacs called crinsta

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement that Golgi Apparatus is made up of membranous sacs called crinsta is incorrect. Golgi Apparatus is actually made up of membranous sacs called cisternae, not crinsta. Therefore, the correct answer is False.

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  • 10. 

    In plants: Pigments, toxic compounds, organic and inorganic compounds and hydrolytic enzymes as well as water are stored in

    • A.

      Golgi apparatus

    • B.

      Intracellular membrane

    • C.

      Central Vacuole

    • D.

      Food vacuole

    Correct Answer
    C. Central Vacuole
    Explanation
    The central vacuole in plants is responsible for storing various substances such as pigments, toxic compounds, organic and inorganic compounds, hydrolytic enzymes, and water. It is a large, fluid-filled organelle that occupies most of the cell's volume. The central vacuole helps maintain the cell's shape, regulate turgor pressure, store nutrients and waste products, and play a role in cell growth and development.

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  • 11. 

    Peroxisomes have 2 types of enzymes, the first type break down organic molecules such as fats and fatty acids releasing H2O2, what does the second type of enzymes do?

    • A.

      Detoxification by breaking down H2O2 into H2O and O

    • B.

      Hydrolisation

    • C.

      Detoxification by breaking down the H2O2 into H2O and O2

    • D.

      There isnt another type of enzymes in peroxisomes

    Correct Answer
    C. Detoxification by breaking down the H2O2 into H2O and O2
    Explanation
    The second type of enzymes in peroxisomes is responsible for detoxification by breaking down H2O2 into H2O and O2. This process helps to eliminate the harmful effects of H2O2 and maintain cellular homeostasis.

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  • 12. 

    Tay-saches patients have lysosomes that lack the enzymes that can digest proteins., so they accumulate in brain cells, causing brain damage.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Tay-Sachs disease is a genetic disorder characterized by a deficiency of an enzyme called hexosaminidase A (Hex-A), which leads to the accumulation of a fatty substance called GM2 ganglioside in the brain and nerve cells. This accumulation causes progressive damage to the cells, leading to severe neurological problems. It is not caused by a lack of enzymes that can digest proteins, but rather by the deficiency of Hex-A enzyme. Therefore, the statement that Tay-Sachs patients have lysosomes that lack the enzymes that can digest proteins is false.

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  • 13. 

    All of these are membranous organelles that arent found in prokaryotic cells and arent part of the endomembrane system except

    • A.

      Peroxisomes

    • B.

      Chloroplasts

    • C.

      Mitochondria

    • D.

      Ribosomes

    Correct Answer
    D. Ribosomes
    Explanation
    Ribosomes are the only organelles listed that are not membranous and are found in both prokaryotic and eukaryotic cells. While peroxisomes, chloroplasts, and mitochondria are all membranous organelles that are not found in prokaryotic cells, ribosomes are unique in that they are non-membranous and can be found in both types of cells. Additionally, ribosomes are not part of the endomembrane system, which includes organelles such as the endoplasmic reticulum and Golgi apparatus that are involved in the synthesis, modification, and transport of proteins.

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  • 14. 

    The cytoskeleton is made up of microfilaments, microtubules and .............. microfilaments. fill in the space by selecting the suitable word.

    • A.

      Mediated

    • B.

      Intermediate

    • C.

      Tubulin dimer

    • D.

      Spindle

    Correct Answer
    B. Intermediate
    Explanation
    The cytoskeleton is made up of microfilaments, microtubules, and intermediate filaments. Intermediate filaments provide structural support and help maintain cell shape. They are made up of various proteins, such as keratins, vimentin, and lamin, and are involved in various cellular processes, including cell migration, cell division, and mechanical strength.

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  • 15. 

    Mitochondria and chloroplasts are similar in the way of that they both are membrane bound organelles and they both work on converting energy.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Mitochondria and chloroplasts are both membrane-bound organelles found in eukaryotic cells. They are similar in their function of converting energy. Mitochondria are responsible for cellular respiration, where they convert glucose into ATP, the main energy currency of the cell. Chloroplasts, on the other hand, are found in plant cells and are responsible for photosynthesis, where they convert sunlight into glucose and oxygen. Both organelles play a crucial role in energy conversion within the cell, making the statement true.

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  • 16. 

    Cilia and flagella 's microtubular arrangement is

    • A.

      9 + 2

    • B.

      9 + 3

    • C.

      9 + 0

    • D.

      9 + 1

    Correct Answer
    A. 9 + 2
    Explanation
    Cilia and flagella have a microtubular arrangement known as 9 + 2. This means that they have nine pairs of microtubules surrounding two central microtubules. This arrangement provides structural support and allows for the movement of cilia and flagella.

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  • 17. 

    .................... is a network of glycoprotein molecules attached to the outer surface of the animal cell's plasma membrane.

    • A.

      Ribosome

    • B.

      Intercellular golgi

    • C.

      Extracellular matrix

    • D.

      Entracellular matrix

    Correct Answer
    C. Extracellular matrix
    Explanation
    The extracellular matrix is a network of glycoprotein molecules attached to the outer surface of the animal cell's plasma membrane. It provides structural support to the cell and helps maintain its shape. It also plays a role in cell signaling, cell adhesion, and cell migration. The extracellular matrix is composed of various proteins, such as collagen and fibronectin, which are secreted by the cell and form a mesh-like structure around it. This matrix acts as a scaffold for cells and tissues and is involved in many physiological processes.

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  • 18. 

    In the plasma membrane, signals are sent to the cytoskeleton through the protein called ............ and the cell works on a suitable response accordingly.

    • A.

      Glycerin

    • B.

      Ribose

    • C.

      Dyosine

    • D.

      Integrin

    Correct Answer
    D. Integrin
    Explanation
    Integrin is a protein found in the plasma membrane that plays a crucial role in signal transduction. It acts as a bridge between the extracellular matrix and the cytoskeleton, allowing signals to be transmitted from the outside of the cell to the inside. This communication is essential for the cell to respond appropriately to its environment and carry out various functions such as cell adhesion, migration, and differentiation. Therefore, integrin is the correct answer as it is responsible for transmitting signals to the cytoskeleton, enabling the cell to work on a suitable response.

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  • 19. 

    FUNCTIONS of the Extracellular matrix (ECM) include all of those stated below except

    • A.

      Cell communication

    • B.

      Regulation of cell behaviour via a protein

    • C.

      Cell motility

    • D.

      Cell recognition

    Correct Answer
    C. Cell motility
    Explanation
    The extracellular matrix (ECM) is a complex network of proteins and carbohydrates that provides structural support to cells and tissues. It plays a crucial role in various cellular functions, including cell communication, regulation of cell behavior via proteins, and cell recognition. However, cell motility refers to the ability of cells to move and migrate, which is not a function of the ECM. Therefore, the correct answer is "Cell motility".

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  • 20. 

    The 3 Glycoproteins that make up the extracellular matrix are fibronectin, proteoglycan and the most abundant one is ..............

    • A.

      Fibers

    • B.

      Collagen

    • C.

      Glucose

    • D.

      Galactose

    Correct Answer
    B. Collagen
    Explanation
    Collagen is the correct answer because it is the most abundant glycoprotein in the extracellular matrix. It provides structural support and strength to tissues and organs. Collagen fibers are found in various connective tissues throughout the body, such as skin, bones, tendons, and cartilage. They contribute to the overall integrity and function of these tissues, making collagen an essential component of the extracellular matrix.

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  • 21. 

    Protein pores in cell wall of adjacent plant cells are called

    • A.

      Gap junctions

    • B.

      Desmosomes

    • C.

      Tight junctions

    • D.

      Plasmodesmata

    Correct Answer
    D. Plasmodesmata
    Explanation
    Plasmodesmata are protein pores found in the cell walls of adjacent plant cells. These pores allow for communication and transport of molecules between the cells, enabling them to function as a coordinated unit. Gap junctions are found in animal cells and allow for communication between adjacent cells. Desmosomes are specialized junctions that provide mechanical strength to tissues. Tight junctions are found in animal cells and help to create a barrier between cells. Therefore, the correct answer is Plasmodesmata.

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  • 22. 

    Desmosomes are junctions that hold cells into strong sheets and DONT allow space between them

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Desmosomes are junctions that hold cells into strong sheets and allow space between them. Unlike tight junctions, desmosomes provide strong adhesion between cells while still allowing for some space between them. This allows for flexibility and movement within tissues. Therefore, the correct answer is false.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 31, 2017
    Quiz Created by
    Sara.badran.sb
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