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Cell The Unit of Life Test - 56

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Cell The Unit of Life Test - 56
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  • Question 1
    1 / -0
    Karyology is the study of
    Solution
    • A karyotype is the number and appearance of chromosomes in the nucleus of a eukaryotic cell. The term is also used for the complete set of chromosomes in a species or in an individual organism. The study of whole sets of chromosomes is sometimes known as karyology. Hence, the karyology is the study of the nucleus.
    • So, the correct answer is 'nucleus'.
  • Question 2
    1 / -0
    The nucleus is separated from surrounding cytoplasm by a nuclear membrane, which is:
    Solution
    Surrounding every nucleus is a double-layered membrane called the nuclear membrane or nuclear envelope. This membrane separates the nucleoplasm from the cytoplasm.
    The nuclear membrane consists of two lipid bilayers - the inner nuclear membrane, and the outer nuclear membrane. It also has many small holes called nuclear pores that allow materials to move in and out of the nucleus.
    So, the answer is 'C'.
  • Question 3
    1 / -0
    House keeping proteins are found in
    Solution
    House keeping proteins are constitutive proteins that are required for the maintenance of basic cellular function. These proteins are needed in all the cells of the human body and are found in the endoplasmic reticulum. These are expressed in all the cells of the humans under normal physiological conditions.
    So, the correct answer is option A.
  • Question 4
    1 / -0
    The Sub-units of $$80$$S ribosome will be
    Solution
    Ribosomes are the site of protein synthesis. It exists in two forms the 70s and 80S. The prokaryotic cell has 70S ribosomes while the eukaryotic cell has 80S ribosomes. The 60S and 40 are subunits of eukaryotic (80S) ribosomes.
    So, the correct answer is option B.

  • Question 5
    1 / -0
    The powerhouse of cell is first discovered by
    Solution
    Mitochondria which is also known as the powerhouse of the cell was first discovered by Kolliker in $$1850$$. It is the site of cellular respiration. It actively participates in the production of energy in form of ATP. It is the site of respiratory cycle like TCA and electron transport system.
    So, the correct answer is option B.
  • Question 6
    1 / -0
    Which one is included under 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 examples of prokaryote include bacteria, Cyanobacteria or blue-green alage. Mycoplasma are small bacteria without cell wall. Hence, those are also included under prokaryotes. 
    Thus, the correct answer is 'Mycoplasma and Blue-Green Algae.'
  • Question 7
    1 / -0
    The following are called "suicidal bags"
    Solution
    • Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
    • It helps in digestion and waste removal within a cell.
    • They contain digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
    • They are also known as suicidal bags because they can digest or damage its own cell causing the cell death (autolysis). 
    • So, the correct answer is 'Lysosomes'.
  • Question 8
    1 / -0
    Cell organelles having acid hydrolases/digestive enzymes are
    Solution
    • Lysosomes are membrane-bound organelles which are capable of breaking down biomolecules such as proteins, nucleic acids, carbohydrates and lipids.
    • It helps in digestion and waste removal within a cell.
    • They contain acid hydrolases or digestive enzymes that digest excess or worn out organelles, food particles, engulfed viruses or bacteria and macromolecules.
    • So, the correct answer is 'Lysosomes'.
  • Question 9
    1 / -0
    Ribosomes are the centre for
    Solution
    • Ribosomes can be defined as molecular machines that are responsible for the production of proteins in all the living cells (site for protein synthesis).
    • Ribosomes are membrane-bound structures which consist of components
    1) Small ribosomal subunits (reads the RNA).
    2) Large subunits (join amino acids to form polypeptide chain)
    So, the correct answer is 'Protein synthesis'
  • Question 10
    1 / -0
    Part of spindle left after chromosomes have moved to poles is :
    Solution
    The remnants of spindles that are left after completing anaphase and telophase certainly in some plant cells are called phragmoplast. So, the correct option is D.
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