done 11th Biology Cell : The Unit Of Life

• question_answer1)
  Which of the following is not correct? (a) Robert Brown discovered the cell (b) Schleiden and Schwann formulated the cell theory (c) Virchow explained that cells are formed from pre-existing cells (d) A unicellular organism carries out its life activities within a single cell.
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• question_answer2)
  New cells generate from (a) bacterial fermentation (b) regeneration of old cells (c) pre-existing cells (d) abiotic materials
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• question_answer3)
  Match the following columns.  

  Column I	Column II
  A. Cristae	1. Fat membranous sacs in stroma.
  B. Cisternae	2. Infoldings in mitochondria.
  C. Thylakoids	3. Disc-shaped sacs in Golgi apparatus.

   
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• question_answer4)
  Which of the following is correct? (a) Cells of all living organism have a nucleus (b) Both animal and plant cells have a well defined cell wall (c) In prokaryotes, there are no membrane bound organelles (d) Cells are formed de now from abiotic materials
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• question_answer5)
  What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
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• question_answer6)
  How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?
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• question_answer7)
  Name two cell organelles that are double membrane bound. What are the characteristics of these two organelles. State their functions and draw labelled diagrams of both.
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• question_answer8)
  What are the characteristics of prokaiyotic cells?
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• question_answer9)
  Multicellular organisms have division of labour. Explain.
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• question_answer10)
  Cell is the basic unit of life. Discuss in brief.
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• question_answer11)
  What are nuclear pores? State their function.
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• question_answer12)
  Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.
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• question_answer13)
  Describe the structure .of the following with the help of labelled diagrams. (i) Nucleus                 (ii) Centrosome    
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• question_answer14)
  What is a centromere? How does the position of the centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
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• question_answer15) A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is (a) absence of mitochondria                                       (b) presence of cell waif (c) presence of hemoglobin                        (d) absence of nucleus

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• question_answer16)   Select one which is not true for ribosome (a) Made up of two sub-units                                     (b) Form polysome (c) May attach to mRNA                                                (d) Have no role in protein synthesis

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• question_answer17)   Which one of these is not a eukaryote? (a) Euglena                         (b) Anabaena    (c) Spirogyra                       (d) Agaricus

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• question_answer18)   Which of the following stain is not used for staining chromosomes? (a) Basic fuschin(b) Safranin                        (c) Methylene blue           (d) Carmine

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• question_answer19)   Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings. I. Mycoplasma                    II. Ostrich eggs III. Human RBC                    IV. Bacteria (a) I, IV, III, II                        (b) I, II, III, IV                    (c) II, I,III, IV                        (d) III, II, I, IV

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• question_answer20)   Which of the following features is common to prokaryotes and many eukaryotes? (a) Chromatin material present                                 (b) Cell wall present (c) Nuclear membrane present (d) Membrane bound sub-cellular organelles present

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• question_answer21)   Who proposed the fluid mosaic model of plasma membrane? (a) Camillo Golgi                                                               (b) Schleiden and Schwann (c) Singer and Nicolson                                                  (d) Robert Brown

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• question_answer22)   Which of the following statement is true for a secretory cell? (a) Golgi apparatus is absent (b) Rough Endoplasmic Reticulum (RER) is easily observed in the cell. (c) Only Smooth Endoplasmic Reticulum (SER) is present. (d) Secretory granules are formed in nucleus.

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• question_answer23)   What is a tonoplast? (a) Outer membrane of mitochondria (b) Inner membrane of chloroplast (c) Membrane boundary of the vacuole of plant cells (d) Cell membrane of a plant cell

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• question_answer24)   Which of the following is not true of a eukaryotic cell? (a)Cellwallismadeupofpeptidoglycans (b) It has 80S type of ribosome present in the cytoplasm (c) Mitochondria contain circular DNA (d) Membrane bound organelles are present

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• question_answer25)   Which of the following statement is not true for plasma membrane? (a) It is present in both plant and animal cell (b) Lipid is present as a bilayer in it (c) Proteins are present integrated as well as loosely associated with the lipid bilayer (d) Carbohydrate is never found in it

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• question_answer26)   Plastid differs from mitochondria on the basis of one of the following features. Mark the right answer. (a) Presence of two layers of membrane              (b) Presence of ribosome (c) Presence of thylakoids                                            (d) Presence of DNA

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• question_answer27)   Which of the following is not a function of cytoskeleton in a cell? (a) Intracellular transport                                             (b) Maintenance of cell shape and structure (c) Support of the organelle                                        (d) Cell motility

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• question_answer28)   The stain used to visualise mitochondria is (a) fast green                     (b) safranin                         (c) acetocarmine              (d) janus green

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• question_answer29)   What is the significance ofvacuole in a plant cell?

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• question_answer30)   What does 'S' refer in a 70S and 80S ribosome?

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• question_answer31)     Mention a single membrane bound organelle which is rich in hydrolytic enzymes.

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• question_answer32)   What are gas vacuoles? State their functions.

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• question_answer33)     What is the function of a polysome? (Gk. Poly = many, Soma = body).

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• question_answer34)   What is the feature of a metacentric chromosome?

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• question_answer35)   What is referred to as satellite chromosome?

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• question_answer36)   Discuss briefly the role of nucleolus in the cells actively involved in protein synthesis.

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• question_answer37)   Explain the association of carbohydrate to the plasma membrane and its significance.

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• question_answer38)     Comment on the cartwheel structure of centriole.

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• question_answer39)   Briefly describe the cell theory.

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• question_answer40)   Differentiate between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).

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• question_answer41)   Give the biochemical composition of plasma membrane. How are lipid molecules arranged in the membrane?

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• question_answer42)       What are plasmids? Describe their role in bacteria.

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• question_answer43)   What are histories? What are their functions?

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• question_answer44)   What structural and functional attributes must a cell have to be called a living cell?

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• question_answer45)   Briefly give the contributions of the following scientists in formulating the cell theory (a) Rudolf Virchow (b) Schleiden and Schwann

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• question_answer46)   Is extragenomic DNA present in prokaryotes and eukaryotes? If yes, indicate their location in both the types of organisms. 

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• question_answer47)   Structure and function, are correlatable in living organisms. Can you justify this by taking plasma membrane as an example?

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• question_answer48)     Eukaryotic cells have organelles which may (a) not be bound by a membrane (b) bound by a single membrane (c) bound by a double membrane Group the various sub-cellular organelles into these three categories.

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• question_answer49)   The genomic content of the nucleus is constant for a given species where as the extra chromosomal DNA is found to be variable among the members of a population. Explain.

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• question_answer50)   Justify the statement, 'Mitochondria are power houses of the cell'.

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• question_answer51)   Is there a species specific or region specific type of plastids? How does one distinguish one from the other?

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• question_answer52)   Vimte the functions of the following (a) Centromere                    (b) Cell wall                     (c) Smooth ER                (d) Golgi apparatus (e) Centrioles

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• question_answer53)   Are the different types of plastids interchangeable? If yes, give examples where they are getting converted from one type to another.

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