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Cell The Unit of Life Test - 21

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Cell The Unit of Life Test - 21
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  • Question 1
    1 / -0
    Which among the following is absent in prokaryotes?
    Solution
    Prokaryotes are unicellular organisms that lack membrane-bound organelles such as mitochondria, golgi apparatus. They also lacks true nucleus. Instead, they have nucleoid. Nucleoid is genetic material without nuclear envelope. The example of prokaryote includes bacteria. 
    Thus, the correct answer is 'All of the above.'
  • Question 2
    1 / -0
    The organelle that destroys worn-out cells ______________.
    Solution
    A lysosome is a membrane-bound cell organelle that contains digestive enzymes. 
    Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. 
  • Question 3
    1 / -0
    Ribosome
    Solution
    Ribosome consists of one large and one small subunit. Eukaryotes have 80S ribosomes while prokaryotes have 70S ribosomes. Four binding sites are present in the ribosomes one for mRNA and 3 for tRNA.
    So the correct answer is C.
  • Question 4
    1 / -0
    Which one is present in prokaryotes?
    Solution
    Prokaryotes are unicellular organisms that lack membrane-bound organelles like mitochondria and Golgi apparatus. They also lack a true nucleus. Instead, they possess nucleoid, in which genetic material is not surrounded by a nuclear envelope. They posses ribosomes in the cytoplasm. The example includes bacteria.
    Thus, the correct answer is 'None of the above.'
  • Question 5
    1 / -0
    Match the following :
     List I List II
     A. Cristae 1. Flat membranous sacs in stroma
     B. Cisternae 2. Infolding
     C. Thylakoids 3. Disc-shaped sacs in Golgi apparatus
    Solution
    The inner membrane of mitochondria is infolded variously to form involutions which are called cristae. They are meant for increasing the physiologically active area of the inner membrane. The density of cristae indicates the intensity of respiration.
    Golgi apparatus consists of a stack of generally 4-8 membrane-bound cisternae. Cisternae are disc-shaped. Their membranes are smooth but of variable thickness. They enclose a lumen of 60-90 Angstrom. The cisternae are frequently curved to give a definite polarity to the Golgi apparatus.
    Thylakoids are membrane lined flattened sacs which run through-out the stroma or matrix of the chloroplast. Since they take part in photosynthesis; they are also called photosynthetic thylakoids. Thylakoids are thus the structural elements of the chloroplast. They generally run parallel but may show interconnections. Thus, the correct answer is option C.
  • Question 6
    1 / -0
    Mitochondria are called the power houses of the cell. 
    Which of the following observations supports this statement?
    Solution
    Mitochondria are called the power houses of the cell because they generate energy-rich molecules. ATP from food by the process of aerobic respiration which is required for various cell operation.
    Thus, the correct answer is option A.
  • Question 7
    1 / -0
    During phloem transportation sugar is moved in form of sucrose in to the companion cells and them into the living phloem sieve tube cells by -
    Solution
    Pholem is the food-conducting tissue.
    The sugar sucrose is transported from the companion cells to the sieve tube by the mechanism for simple diffusion because of the concentration gradient.
    The concentration of the sucrose is higher in the companion cells an lower in sieve tubes.
    So, the correct option is 'Passive transport'
  • Question 8
    1 / -0
    Power house of cell is known as
    Solution
    • The mitochondria are usually sausage-shaped organelles found in cell and are the main seats of cell respiration. They bring about stepwise oxidation of food and transfer the energy so released to the energy carrier ATP. ATP is used to bring about energy-requiring activities in the cell. On this account, the mitochondria are often described as the powerhouses or storage batteries of the cell. 
    • The Golgi bodies are concerned with modification, sorting and packaging of materials coming from the ER or synthesized in Golgi itself. It is also concerned with the formation of glycoproteins, lipoproteins and cell wall formation,
    • The ribosomes provide space for the synthesis of proteins in the cell and are known as protein factories of cell. 
    • The lysosomes are involved in the digestion of useful materials, harmful materials, unwanted materials and for this they contain hydrolytic enzymes. They are known as suicide bags of cell as they digest their own materials during starvation. 

    Thus, the correct answer is option B. 
  • Question 9
    1 / -0
    Of the following, which is not associated with the mitochondria?
    Solution
    The mitochondria are organelles found in eukaryotic cells that are associated with energy production or with the production of ATP. Mitochondria are made up of two membranes- the outer and the inner membrane. The inner membrane form folds called the cristae that enclose the matrix. There is no structure called the stroma present in the mitochondria.
    So, the correc answer is 'Stroma'.
  • Question 10
    1 / -0
    Function of signal recognition particle (SRP) is
    Solution
    The signal recognition particle (SRP) is a ribonucleoprotein particle essential for the targeting of signal peptide-bearing proteins to the prokaryotic plasma membrane or the eukaryotic endoplasmic reticulum membrane for secretion or membrane insertion. SRP (signal recognition particle) is a molecule that helps the ribosome-mRNA-polypeptide complexes to settle down on the membrane of the endoplasmic reticulum.
    So, the correct answer is 'All the above.'
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