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Cell - The Fundamental Unit of Life Test - 1

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Cell - The Fundamental Unit of Life Test - 1
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  • Question 1
    1 / -0

    Which of the following statements are true about endoplasmic reticulum?

    (a) Smooth endoplasmic reticulum makes lipids.
    (b) It is also called the control centre of the cell.
    (c) RER has ribosomes attached to its surface.
    (d) It modifies chemicals that are toxic to the cell.

    Solution

    Endoplasmic reticulum has two components: rough and smooth, based on the presence and absence of ribosomes. RER has ribosomes attached to its surface and hence, is responsible for the formation of proteins. SER is concerned with the synthesis of lipids. ER also helps in detoxification of toxins and drugs.

     

  • Question 2
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    Which of the following is true for a plasma membrane?

    Solution

    Plasma membrane does not help in protein synthesis. It is done by ribosomes. Plasma membrane regulates the movement of water and dissolved salts in and out of the cells. Hence, it is semi-permeable. Mitochondria is the organ involved in energy production.

     

  • Question 3
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    Which of the following cell constituents cannot be seen while observing a human cheek cell?

    Solution

    Cell-wall is the characteristic feature of plant, fungal and bacterial cells. It is not present in animal cells, like human cheek cells.

     

  • Question 4
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    Which of the following is true for proteins that are secreted by cells?

    Solution

    The proteins are synthesised in the RER. These are then transported to the golgi apparatus, where these are modified and processed as required.

     

  • Question 5
    1 / -0

    The nucleolus helps in the formation of

    Solution

    The nucleolus is a round body located inside the nucleus of a eukaryotic cell. It is not surrounded by a membrane, but sits in the nucleus. The nucleolus makes ribosomal sub-units from proteins and ribosomal RNA, also known as rRNA.

     

  • Question 6
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    Mitochondria and chloroplasts are similar because

    Solution

    Both DNA and chloroplasts are semi-autonomous organelles. Both of them possess their own DNA.

     

  • Question 7
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    The cell organelle storing substances like starch, oil and proteins is

    Solution

    Plastids are of two types: Chromoplasts and Leucoplasts. Leucoplasts are concerned with storage. The following are examples of leucoplasts: Amlyloplast: It stores starch and is found in tubers, cotyledons and endosperm.

    Elaioplast: It stores oil and is found in the epidermal cells.

    Proteinoplast: It stores protein and is found in seeds and nuts.

     

  • Question 8
    1 / -0

    The lipids and proteins essential for the formation of cell membrane are synthesised in

    Solution

    Endoplasmic reticulum consists of SER and RER. RER is concerned with the formation of proteins and SER is responsible for the synthesis of lipids.

     

  • Question 9
    1 / -0

    Plasmolysis in a plant cell is defined as

    Solution

    Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell.

     

  • Question 10
    1 / -0

    The amount of DNA doubles during which phase of the cell cycle?

    Solution

    S phase (synthesis phase) is the part of the cell cycle in which DNA is replicated. It occurs between G1 phase and G2 phase.

     

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