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The Fundamental Unit of Life Test - 32

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The Fundamental Unit of Life Test - 32
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  • Question 1
    1 / -0
    The codes for the specific proteins produced by a cell lies in the ________.
  • Question 2
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    The membrane that forms an extensive network inside a cell is
    Solution
    Mitochondria, chloroplast and Golgi apparatus are double membrane bound organelles. The ribosome is nonmembrane bound. Endoplasmic reticulum consists of an interconnected network of membranous tubules called as cisternae and permeates the whole cytosol. Thus, the correct answer is option D. 
  • Question 3
    1 / -0
    Larger sized organisms usually have
  • Question 4
    1 / -0
    Nucleoplasm is also called
    Solution
    • Nucleoplasm refers to the soluble materials present within the nucleus that is enclosed by the nuclear envelope.
    • It is made up of enzymatic proteins (for replication of DNA and transcription RNA), ribonucleoproteins, enzymes, ions etc.
    • It is also known as karyolymph or nuclear sap.
    • So, the correct answer is 'Both A and B'.
  • Question 5
    1 / -0
    Dense fibrous complex lying adjacent to inner membrane of nuclear envelope is
    Solution
    • The nuclear membrane or karyotheca is a double membrane having pores at intervals.
    • The nuclear membrane on its inside has a supporting membrane called the nuclear lamina or the fibrous lamina having a uniform thickness.
    • It is a dense network of fibres present inside the nucleus of cells and are made up of intermediate filaments and membrane-associated proteins.
    • It provides mechanical support to the nucleus and also regulates DNA replication and cell division 
    • So, the correct answer is 'Both B and C.'
  • Question 6
    1 / -0
    Experiments to demonstrate importance of nucleus in controlling growth and heredity were performed on
    Solution

    • Hammerling's nucleocytoplasmic experiments state that the cytoplasm is the centre for all the metabolic activities in the cell and the nucleus is the controlling centre. 

    • This experiment was conducted using Acetabularia.

    • Acetabularia is a genus unicellular or single-celled green algae belonging to the family Polyphysaceae which are found in subtropical waters.

    • They are gigantic in size and complex in form, therefore, used in experiments in cell biology.

    • So, the correct answer is 'Acetabularia'.

  • Question 7
    1 / -0
    A thoroughly washed beetroot slice kept in water at room temperature does not lose anthocyanin pigment because plasma membrane is _______.
    Solution
    B. Impermeable to anthocyanin
    Reason : The plasma membrane of the cell is selectively permeable. When the beetroot slice is kept in cold water, anthocyanin is impermeable to the cell membrane because of its bulky structure. But if it is kept in hot water, the plasma membrane will get destabilized and the anthocyanin pigment will come out. 
    So, the correct option is B.
  • Question 8
    1 / -0
    Nucleus was discovered by
    Solution
    Correct Option: C
    Explanation:
    • Robert Brown was a Scottish life scientist and paleobotanist who discovered the nucleus and discovered that each and every animal are the product of cells. 
    • The cell nucleus​ could be a membrane-shaped structure that consists of a cell's hereditary statistics and controls its extension and copy.
    •  It is the command center of a organism cell and is typically the foremost notable cell organ in each size and performance.
    •  Hence, Nucleus was discovered by Robert Brown.
  • Question 9
    1 / -0
    Components of nucleus are
    Solution
    The main components of the nucleus are-
    1) Nucleolemma or nuclear membrane or karyotheca- is a limiting membrane that separates the nucleus from the cytoplasm and transports important material between the nucleus and cytoplasm.
    2) Nucleolus is a spherical dark structure present inside the nucleus
    3) Chromatin is genetic material made of DNA and histone protein
    4) Nuclear matrix or nucleoplasm is  semifluid homogenous substance
    Hence the correct option is A.
  • Question 10
    1 / -0
    Nucleus controls cytoplasmic functioning by sending out
    Solution
    • The DNA present in the nucleus undergoes transcription to form the messenger RNA or mRNA.
    • The mRNA formed within the nucleus is transported out of the nucleus and into the cytoplasm of the cell and gets attached to the ribosomes. 
    • It then synthesis proteins in the cytoplasm which is required by the cell for various cellular activities.
    • So, the correct answer is 'RNAs'.
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