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Cell The Unit of Life Test - 27

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Cell The Unit of Life Test - 27
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Nobel prize in 1991 for discovering the single ion channels in cell was awarded to
    Solution
    In 1991, the Nobel prize in medicine or physiology was given to Erwin Neher and Bert Sarkmann for the discovery of single ion channels in cells. They were able to develop a technique that registers very minute variations in electric currents that passes through a single ion channel. This new method helped them to watch the activity of a single molecule.  
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    Which of the following shows that metabolic energy is required in the absorption of ions

    Solution
    The absorption of ions, involving use of metabolic energy is called active absorption. Energy is generally obtained from ATP.Therefore active absorption is linked to hydrolysis of ATP
  • Question 3
    1 / -0
     Which cell organelle is said to function as a "trigger of cell division"?
    Solution
    Lysosome is an organelle also known as the suicidal bag of the cell. Lysosome plays an essential role in stimulating cell division by digestion of repressor molecules. Thus lysosome triggers cell division. 
  • Question 4
    1 / -0
    Which of the following options are not a function of ribosomes?
    (i) It helps in manufacture of protein molecules.
    (ii) It helps in manufacture of enzymes.
    (iii) It helps in manufacture of hormones.
    (iv) It helps in manufacture of starch molecules.
    Solution
    Ribosomes are majorly involved in protein synthesis, as these are the sites of protein synthesis and enzymes. It also synthesizes amino acids which polymerize to form proteins.
  • Question 5
    1 / -0
    Depending upon size and centromere position, the 46 chromosomes

    have been divided into a number of groups 
    Solution
    Depending upon the position of centromere and relative length of two arms, human chromosomes are of three types- metacentric, submetacentric and acrocentric. The photograph of chromosomes are artifically arranged in the order of descending length is seven group (A to G).
  • Question 6
    1 / -0
    The proteins and lipids, essential for building the cell membrane, are manufactured by
    Solution
    • The endoplasmic reticulum is of two types on the basis of the presence of ribosomes. If the endoplasmic reticulum ribosomes are attached to them then it is called a rough endoplasmic reticulum and if there are no ribosomes on the endoplasmic reticulum then it is called a smooth endoplasmic reticulum.
    • The rough endoplasmic reticulum produces and transports protein and the smooth endoplasmic reticulum produces and transports lipid which provides a framework to the plasma membrane a known as membrane biogenesis.
    • So, the correct answer is option A.
  • Question 7
    1 / -0
    Which of the following has cell wall not made up of cellulose?
    Solution
    Bacteria is a prokaryotic unicellular organism whose cell wall is made up of peptidoglycan. Hydrilla, mango and cactus are plants which have a tough cell wall made up of cellulose.
    So, the correct answer is option A.
  • Question 8
    1 / -0
    Which of the following is not related to endoplasmic reticulum?
    Solution
    The site of energy generation is mitochondria. The endoplasmic reticulum is involved in the transportation of protein and other material as well as the site for some biochemical activities. Thus, the correct answer is option C.
  • Question 9
    1 / -0
    Well defined nucleus is absent in
    Solution
    Algae are a very large and diverse group of eukaryotic organisms, ranging from the microscopic unicellular Chlorella and the diatoms to giant multicellular kelps, the large brown alga. Diatoms are algae (most commonly known as phytoplanktons) with secondary chloroplasts derived from an endosymbiotic red alga. Yeats is also a eukaryote belonging to the kingdom Fungi. However, the Blue-green algae or Cyanobacteria is the most primitive photosynthetic bacteria (prokaryotic- the absence of well-defined nucleus) cell which is quite small and usually unicellular, though they often grow in colonies large enough to see.
    Hence, the correct answer is option A.
  • Question 10
    1 / -0
    Which one of the following structures is an organelle within an organelle?
    Solution
    Ribosomes are the cell organelles which helps in the synthesis of proteins.

    There are 2 types of ribosomes based on the subunits. In prokaryotes 70S ribosomes are present while in eukaryotes 80S ribosomes are seen.
    There are 2 subunits in the ribosomes such as large and small subunit. In 80S ribosome the subunits are 40S and 60S. While in 80S ribosomes, 50S and 30S ribosomes are present.
    They are generally present attached to the Rough endoplasmic reticulum (RER).

    In eukaryotic cells they are also found in some other cell organelles.
    In plants, the ribosomes are seen inside chloroplasts and mitochondria.
    While in animal cells, they are seen in mitochondria alone apart from RER.
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