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Cell The Unit of Life Test - 67

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Cell The Unit of Life Test - 67
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  • Question 1
    1 / -0
    An interconnected membranous network of the cell composed of vesicles, flattened sacs and tubules is
    Solution
    The endoplasmic reticulum is shortly abbreviated as ER. It is a type of organelle in eukaryotic cells.
    The structure of ER is composed of the interconnected network of flattened and membrane-enclosed sacs or tube-like structures. These structures are known as cisternae.
    There are two regions of the ER. Smooth ER and rough ER are classified on the basis of absence and presence of ribosomes on the surface of the ER respectively.
    Thus, the correct answer is option B. 
  • Question 2
    1 / -0
    Which of the following sequence is correct for the origin of lysosome
  • Question 3
    1 / -0
    Which of those organelles does not contain ribosomes?
    I. Rough endoplasmic reticulum II. Chloroplast Ill. Golgi apparatus IV. Mitochondria
    Solution
    I. The rough endoplasmic reticulum is an interconnected network of flattened, membrane-enclosed sacs or tube-like structure which is studded with ribosomes.
    II. The chloroplast is a plastid which contains ribosomes (70S type) which contains green-pigment called chlorophyll.
    III. Golgi apparatus consists of a complex of vesicles and folded membranes within the cytoplasm of the cells and is involved in secretion and intracellular transport and lacks ribosomes.
    IV. The mitochondria is a double-membraned cell organelle, known as the powerhouse which contains ribosomes (70S mitochondrial ribosomes).
    So, the correct answer is 'III only'.
  • Question 4
    1 / -0
    What is true of ribosomes?
    Solution
    • Ribosomes are known as protein factories because they are the main site of protein synthesis. 
    • They are composed of ribonucleic acids and proteins.
    • So, the correct answer is 'Composed of RNA and proteins'.
  • Question 5
    1 / -0
    Interconnected flattened sacs of endoplasmic reticulum are called
    Solution
    • The endoplasmic reticulum (smooth and rough) is an interconnected network of flattened, membrane-enclosed sacs or tube-like structure which are evenly distributed throughout the cytoplasm.
    • The interconnected flattened sacs of the endoplasmic reticulum are called cisternae.
    • So, the correct answer is 'Cisternae'.
  • Question 6
    1 / -0
    Double membraned envelop is found in
    Solution
    • The mitochondria is a double-membraned cell organelle, known as the powerhouse of the cell which is present in all eukaryotic cells.
    • The nucleus is enclosed by the nuclear envelope which is a double-layered membrane that consists of nuclear pores to regulate the transportation of substances such as RNA into and out of the nucleus. 
    • The chloroplast is also covered by a double membrane which is known as the chloroplast envelope.
    • So, the correct answer is 'Mitochondria, nucleus and chloroplast'.
  • Question 7
    1 / -0
    RER is rough as it contains on its surface
  • Question 8
    1 / -0
    Which is common between chloroplasts, chromoplasts and leucoplasts?
  • Question 9
    1 / -0
    Which is not constituent of cell membrane?
  • Question 10
    1 / -0
    The chief functions of ER are

    I. Protein synthesis
    II. Lipid synthesis
    III. Glycogen synthesis
    IV. Cholesterol synthesis
    V. ATP synthesis
    VI. Detoxification

    Choose the correct answer.
    Solution
    • The Endoplasmic reticulum (ER) is a eukaryotic organelle that forms an interconnected network of tubules, vesicles, and cisternae within cells. Rough endoplasmic reticulum synthesizes proteins, 
    • while smooth endoplasmic reticulum synthesizes lipids and steroids, metabolizes carbohydrates and steroids and regulates calcium concentration, drug detoxification and attachment of receptors on cell membrane proteins. Sarcoplasmic reticulum solely regulate calcium levels.
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