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Cell The Unit of Life Test - 38

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Cell The Unit of Life Test - 38
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  • Question 1
    1 / -0
    The DNA is not found in
    Solution

    Correct Option: D
    Explanation:

    • DNA is the genetic material of the cell. It is responsible for the inheritance of characters from one generation to the other.
    • Ribosomes are the organelles that are responsible for protein synthesis.
    • They are devoid of DNA. They receive the m-RNA strands for translation into proteins.

  • Question 2
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    Where is the T tubule situated?
    Solution

    A T-tubule originates from the endoplasmic reticulum. It is a deep invagination of the sarcolemma and located at the junction between the A band and I band of skeletal muscle. Through these, the electrical impulses are transmitted from the sarcoplasms to the fiber's interior.
    Thus, the correct answer is option C.

  • Question 3
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    Which is correct about prokaryotic cell?
    Solution
    Prokaryotic cells are not as complex as eukaryotic cells and are called as primitive cell. They have undefined nucleus as the DNA is not contained within a membrane-bound structure, but is coiled up in a region of the cytoplasm called the nucleoid. It does not possesses membrane-bound organelles such as mitochondria, Golgi bogy, E.R.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    Which of the following is not a character of prokaryote?
    Solution
    Prokaryotic cells are characterized by the absence of a membrane-bound true nucleus and other membrane-bound organelles such as mitochondria, Golgi apparatus, E.R. etc. Their DNA fibrils are present in the center of the cell, i.e., in the nucleoid. It consists ribosomes which are the site of protein synthesis and have two subunits; large and small. Prokaryotic ribosomes have 30S and 50S subunits that together make a 70S ribosome. Thus, the correct answer is option C.
  • Question 5
    1 / -0
    Which of the following is a character of prokaryotes?
    Solution
    Prokaryotic cells are characterized by the absence of membrane-bound true nucleus and other membrane-bound organelles. Their genetic material is present in nucleoid in the center of the cell; the nucleoid lacks nuclear membrane as is present in the nucleus of eukaryotes. The cell walls of bacteria are composed of a macromolecule peptidoglycan/mucopeptide which is a repeating framework of long glycan chains having alternate N-acetyl glucosamine and N-acetyl muramic acid. 
  • Question 6
    1 / -0
    The smallest prokaryotic cell is
    Solution
    Mycoplasma is the smallest prokaryotic organism (0.15 to 0.35 micrometer) that lacks cell wall but have rigid plasma membrane rich in sterols and lipoglycans. Bacteria are mobile prokaryotic cells with characteristic peptidoglycan cell wall; they range in size from 0.5 to 5 micrometer length. Bacillus is a rod-shaped bacteria with average size 0.5-1.0 µm width and 1.0-4.0 µm long. Cyanobacteria are photosynthetic aquatic/terrestrial bacteria which range from 1-40 micrometer in diameter. Thus, the correct answer is option A.
  • Question 7
    1 / -0
    Electron microscopic observation reveals the absence of intracellular membranes in the cell of
    Solution
    Eukaryota includes mostly multicellular organisms which are characterized by the presence of a membrane-bound true nucleus and other membrane-bound organelles in the cytoplasm. Mycota includes multicellular, eukaryotic, heterotrophic fungi. Thallophyta includes organisms with eukaryotic thalloid plant body. Both, mycota and Thallophyta are placed under Eukaryota. Prokaryota includes mostly unicellular organisms which are characterized by the absence of membrane-bound true nucleus and other membrane-bound organelles. Thus, the correct answer is option D.
  • Question 8
    1 / -0
    The largest organelle in animal cell is 
    Solution
    Nucleus is the largest organelle in the animal cell, covering upto 10% of the total cell volume. Typically, the average diameter of the nucleus is around 6 microns. On the other hand,  mitochondria (0.5-1 micron) and lysosomes (0.1-1.2 microns) have lesser size but are greater in number. Plastids are absent in animal cells.

    So, the correct answer is  'D'.
  • Question 9
    1 / -0
    Prokaryotic cell is characterized by
    Solution
    Prokaryotic cells are characterized by the absence of a true nucleus and other membrane-bound organelles. Since, plastids, mitochondria, nucleus, endoplasmic reticulum, Golgi bodies are the membrane-bound structures, they are not present in prokaryotes. Prokaryotes have a well-defined rigid cell wall that provides them resistance to drugs/antibiotics/desiccation. Their DNA fibrils are present in the center of the cell, i.e., in the nucleoid. Thus, the correct answer is option D.
  • Question 10
    1 / -0
    Bacteria are not found in _________.
    Solution
    Distilled water is purified by the process of distillation which includes boiling the water, capturing the steam and condensing it back into the water. The whole process kills almost all the life forms present in water and thus, it is said to contain no bacteria. Bacteria are considered the first life form that appeared on earth and is adapted to almost any kind of habitat. Thus, the correct answer is option D. 
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